# All online calculators

## Life

### Calendar

365 days calendar date to Gregorian date The calculator converts a date in 365 days calendar (Armenian, Ancient Egyptian) to a date in Gregorian calendarArmenian calendar This calculator converts a date to an Armenian calendar date and vice versa.Coptic calendar These calculators convert dates between Gregorian and Coptic calendar systems.Days between dates. The historical version. Calculates number of days between two dates taking in account the date of transition to Gregorian calendar.Ethiopian calendar The calculator converts an Ethiopian date to Gregorian date and vice versa.Fixed date to Gregorian date The calculator evaluates the Gregorian date from the fixed date (integer number passed from the beginning of 1.01.01.Gregorian date to Julian date The calculator converts a Gregorian date to a Julian dateGregorian to fixed date Auxiliary calculator for other date conversion calculators. By Calendrical calculations of Dershowitz and Reingold.ISO calendar The calculator converts ISO date to Gregorian date and vice versa.Julian days calculation Calculation of the Julian day for a given date, plus some information.Orthodox Easter date calculator Using a modification of the Gauss algorithm to calculate Orthodox Easter dateRoman calendar The calculators convert dates between Ancient Roman Calendar and Gregorian calendarsWeek days calculator The calculator counts number of week days between two selected dates.### Date and Time

Age Calculate your age with minute precisionAncient Egyptian Calendar The calculator converts an Ancient Egyptian date to Gregorian date and vice versa.Azimuth and solar elevation angle Calculation of azimuth and solar elevation angle by given the coordinates and time of observation. It's possible to input coordinates manually or by selecting from the directory of cities.Convert days to years, months and days This online calculator convert number of days to number of years, months and days in the month.Date and interval Adds and subtracts a specified time interval to the specified dateDate and number of working days (for Russia) Calculator calculates the date of the initial date and the number of working days. Taking into account weekends, holidays and weekend shifts at work days, according to the published decrees of the government of the Russian Federation. Created by user's request.Date by the Julian Day Number Displays Gregorian calendar date corresponding to Julian Day NumberDate calculator Date plus or minus date parts (years, months, days, weeks, hours, minutes, seconds), time zone conversion.Date plus days This online calculator adds or subtracts a given number of days to or from a given date.Date to timestamp converter This calculator converts the date to epoch timestamp in milliseconds, that is, milliseconds since standard epoch of 1/1/1970, as used, for example, in JavaScript.Date weeks out or before This online calculator adds or subtracts given number of weeks to or from a given date.Day of week by date This online calculator outputs day of week for given dateDays count in several date spans The calculator gives total number of days in date span list. Each date span is defined by start date and end date. The calculator can exclude multiple date date span intersections.Gregorian calendar. Julian calendar. The calendar eras. The calculator converts Julian calendar date to Gregorian calendar date taking in account the calendar era.Gregorian date to 365 days calendar The calculator converts Gregorian date to the 365 day calendar date. The calendar has 12 months with 30 days each and 1 month with 5 days.Hebrew calendar The calculator converts dates from Hebrew calendar to Gregorian and vice versa.How many days are there between two dates? This is simple day calculator which determines number of days between two dates.How many hours between two days This online calculator helps you to calculate how many hours (and minutes) between two week days, i.e., Friday at 7 a.m. until Sunday at 9 p.m.How many months are there between two dates? This online calculator calculates how many months are there between two dates.How many weeks are between two dates This calculator determines number of weeks between two given datesHow many workdays between two dates? The calculator evaluates number of working days and holidays for a period of time. The calculator based on the U.S. federal holidays table recognised in most states.Issue number generator Issue Number Generator for unnumbered magazines & comics & newspapers. If magazine did not print issue numbers, only dates, it can number them all, f.e. all Sundays starting with specified date up to specified dateJarvis march This online calculator computes the convex hull of a given set of points using Jarvis march algorithm, aka Gift wrapping algorithmJulian and Gregorian calendars Julian and Gregorian calendars date conversionLength of service calculation Length of service calculation for several periods of workMayan calendar, 2012, the end of the world. About 2012, the end of the world and MayaMonthly issue number generator Issue Number Generator for unnumbered magazines & comics & newspapers. If magazine did not print issue numbers, only months, it can number them all, f.e. all months starting with specified date up to specified dateMoonphases Moon's age and phase calculationNumber of days in a year Number of working days between two dates (for Russia) Calculator calculates the number of days between the two entered dates. Taking into account weekends, holidays and weekend shifts to work days, according to the published decrees of the government of the Russian Federation.Old Russian (Byzantine) system of chronology Old Russian calendar - years since world creationRelease Date Countdown gadget This calculator allows you to configure the release date or event you want to track and use it as countdown gadget via new "Sharing" functionalityRussian non-working days The calculator displays official day offs for the current year and the weekends adjacent to them. The calculator takes into account weekends shifts according to Russian Federation Government Decrees.Sobriety calculator This online calculator calculates how long you’ve been clean and sober down to the second.Sun position at a given date. Azimuth and elevation table. Calculation of azimuth and elevation of the sun above the horizon for a given position and time. Table with one hour increments.Sunrise and sunset calculator Sunrise/Sunset calculation for given latitude and longitude or for given city. Source: Almanac for Computers, 1990 published by Nautical Almanac Office United States Naval ObservatoryWashington, DC 20392The Muslim calendar. The Gregorian calendar conversion The Muslim calendar. The Gregorian calendar conversionTime Span Calculator This online calculator computes how much time is passed between two time points, specified in hours and minutes.Time between two dates with time zone To calculate number of days, hours, minutes and seconds between two dates with time zones.Time difference The calculator gives a time difference in hours or minutes between two selected time zones for the current date and time.Time difference between the cities Calculates the time difference between the two cities based on the catalogue data.Time interval between two dates Calculate time interval between two datesTime percentage The calculator converts time to percent and vice versa.Time period as minutes to midnight This online calculator converts period of something into minutes to midnight, related to the whole timeline as if it took place over the course of a single day.Time units Calculator expresses time interval in different time units.Time zones The calculator shows the current time, universal time, and time for the selected cityTime. Total sum Calculator sums up input time intervalsTimer This online calculator calculates how much time has passed since specified date and time down to the second.Total time Total time This calculator allows you to carry out the addition of the time - it displays the total, the average, minimum, and maximum.Travel Duration This online calculator computes travel duration given departure time and city and arrival time and city using time zones informationUse of Time Summary This calculator summarizes time for different activities entered into tableWeek number of a given date Week number of a given date. Europe (ISO 8601) standard method, US method and simple numeration method.Weeks to months This online calculator converts given number of weeks to approximate number of months and days in the monthWorld time Shows current time for the selected world places### Health

Body fat calculator - YMCA formula Body proportionality Calculates the body proportionality by several body parametersBrunhald formula ideal weight calculator Coronavirus disease epidemic in different countries The calculator compares the coronavirus disease 2019 pandemic development in different countries aligned by number of days since the epidemic beginning in the particular country.Daily Calorie Rate Calculator of the daily calorie rate, taking into account the level of physical activity.Daily Needs Calorie Rate Determination of the baby's sex It's unscientific, but it surprisingly works.Figure's grace Calculation of the figure's grace index by the chest, waist, hip and thigh parameters .Ideal weight calculator using Body Mass Index Ideal weight calculator using Paul Broca formula Ideal weight calculator using Paul Broca formulaLorenc formula of ideal weight McDonald's meal nutrition facts Nutrition facts of McDonald's meals according to http://www.mcdonaldsmenu.infoNagler's ideal weight calculator Pregnancy Due Date Pregnancy Due Date Calculator by the first day of the last menstrual period (LMP)Proportionality of body — McCallum's formula Strength of alcoholic cocktail Calculates volume fraction of alcohol in a beverage made of 3 other beverages.The basal metabolic rate This calculator computes BMR caloriesThe number of packs steroid you need for cycle The number of packs steroid you need for cycleWhen to drive after drinks? Calculates time weathering of alcohol in the blood to normal

### Others

Adjusting picture/pixel sizes proportionally This online calculator adjusts the second dimension of a picture/video, given the new first dimension, keeping the original proportionsCountry code Returns country or territory name by ISO codeCountry language The calculator lists the languages spoken in a given country.Glue solution strength This online calculator can be used to find out required amount of dry glue and water to get the needed solution strengthHack Hack the three-digit codeIn which country can I pay with my currency? Displays list of countries in which you can pay by the selected currency.Ingredients. Proportional quantities This online calculator recalculates quantities of ingredients for given proportions if quantity of one ingredient has changedLarge breed puppy weight gain recommendations Large breed puppy weight gain recommendationsMap of France regions Simple image map of France regions to illustrate usage of SVG image mapsRace Heat Table This is generator of heat grids for kart racing. The goal is to let each racer to try each starting position/kart in random order.Random Latin Quote Random Latin QuoteShoe size comparison This calculator converts european shoe size to its english and US counterparts.USA Full Retirement Date Calculator Based on your birthday, this online calculator calculates your full retirement date, the first month you will be eligible for full Social Security retirement benefits, and the month you can apply for them.What is the currency in this country? Displays the currency of selected country.Which countries speak my language? The calculator lists countries speaking a given language.## Professional

### Computers

Ancient PixelArt: CompuServe RLE file viewer This online calculator can parse and display images from CompuServe graphics files in RLE formatAudio file waveform The calculator displays the waveform of the input audio file fragment.Automated Vigenère cipher decoder This online calculator provides aid in finding Vigenère cipher key if you can guess part of the encrypted text. It just automates some routine calculations, which you would perform manually otherwise.Base 64 encoding and decoding The calculators encode string to base64 string and decode back to original string. Special characters (+/) , generally produced by base64 algorithm, can be replaced by the data provided in additional parameter.Binary Coded Decimal (BCD) This online calculator converts decimal number to binary code in BCD notation and vice versaBinary file You may use this calculator to create binary file by editing its content in hexadecimal, decimal or binary form.Binary, inverse and complement codes Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)Bit length The calculator counts number of bits required to represent a number in the binary form. It also displays an input number in binary, octal, decimal, and hex forms.CSV table to JSON array This online calculator converts CSV table to JSON array of objects, using given map of CSV columns to object properties.Check Digit Mod 11 (ISBN-10 check digit) This online calculator generates and validates check digit with mod11 algorithm, used by ISBN-10Conditional entropy This online calculator calculates entropy of Y random variable conditioned on X random variable and X random variable conditioned on Y random variable given a joint distribution table (X, Y) ~ pConversion between any bases This calculator converts number from one numeral system to another, given both system's basesConversion from decimal numeral system This calculator converts given decimal value to other positional numeral systemCount the number of words The calculator counts word number in a given text. It can be used for rough calculation of translation cost. Can be used for word number calculation in software resources.Decision tree builder This online calculator builds a decision tree from a training set using the Information Gain metricEmail extractor This online calculator parses emails from block of text using regular expressionExtract domain names from URLs and count unique names This calculator extracts domain names from URLs and counts unique namesGET request string parser This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if neededGray code converters These online calculators convert to and from the binary reflected in the Gray code and can produce a table for an n-bit Gray codeH264 Maximum References Frames H264 Maximum References FramesHTML table to JSON array Th calculator converts the html table code to JSON array with optional data transpose and compression. It also visualizes numeric data on chart.Hartley's formula Hartley's formula to determine the amount of information contained in a message with length n.Huffman coding This online calculator generates Huffman coding based on a set of symbols and their probabilitiesInformation gain calculator This online calculator calculates information gain, the change in information entropy from a prior state to a state that takes some information as givenJoint Entropy This online calculator calculates joint entropy of two discrete random variables given a joint distribution table (X, Y) ~ pKeyboard layout and password Converts the word, typed in Russian letters into a set of symbols corresponding to these letters in English keyboard layout which is often used to create a Russian-speaking user passwords.LL1 grammar analysis. Yet another top-down parser generator. The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.LZW This calculator compresses/decompresses a sting using Lempel-Ziv-Welch (LZW) algorithm.Lines filter by number This online calculator filters lines of text by removing designated lines or, you can say, leaving only designated linesList Join This online calculator can join two csv lists by key column the same way JOIN works in SQL (inner join, left outer join, right outer join)List filtering Calculator that allows you to filter the initial list with the specified multiple filtersList format Format a list using regular expressionsList intersection This calculator parses list using regular expression, then counts unique matches and lists them in decreasing orderList reverser This online calculator reverses lines of textMatching lines with regular expression This calculator matches lines in text using regular expression. It outputs line numbers and lines, which were matched and which were not matched, separating them.Network address and subnet mask (IPv4) This online calculator determines subnet parameters for given IP address and subnet maskNumbered list maker This online calculator numbers lines of textPalette generator This calculator generates palette of colors from starting color to ending color, using maximum diversity, "rainbow" style.Playfair cipher This online calculator encrypts and decrypts a message given Playfair cipher keyword. Non-alphabetic symbols (digits, whitespaces, etc.) are ignored.RAID arrays сalculator This calculators shows the possible variants of RAID arrays, based on the number of drives available.RGB - HSV and HSV - RGB converter This calculator converts RGB color to HSV color and vice versaRandom Letters Generator This online generator just generates specified number of symbols, randomly selecting them from given set of symbolsRegular expression tester This online calculator allows user to experiment with regular expressions.Relative luminance and contrast ratio Two calculators evaluate the relative luminance and contrast ratio for given colors.Remove duplicates The calculator removes duplicates from an element list.Repeated Word Heatmap This calculator can help avoid unwanted word repetition in prose. It counts the number of occurrences of each word in the document, both globally, and within the "sliding window" distance before and after each word. It highlights the words which are used frequently near each other.Repeated Word Heatmap This calculator can help avoid unwanted word repetition in prose. It counts the number of occurrences of each word in the document, both globally, and within the "sliding window" distance before and after each word. It highlights the words which are used frequently near each other.Select a phone number from the text This calculator uses regular expressions to select phone numbers from a large block of textShannon Entropy This online calculator computes Shannon entropy for a given event probability table and for a given messageShannon coding This online calculator generates Shannon coding based on a set of symbols and their probabilitiesShannon-Fano coding calculator This online calculator generates Shannon-Fano coding based on a set of symbols and their probabilitiesSimple math in any numeral system This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36Specific Conditional Entropy This online calculator calculates entropy of Y random variable conditioned on specific value of X random variable and X random variable conditioned on specific value of Y random variable given a joint distribution table (X, Y) ~ pSplit list items according to regular expression This online calculator splits list items according to the result of matching the regular expression. Matched value becomes a group key, list items with the same matched value create a separate group.String to list converter This online calculator splits string by regular expression and outputs the list of matches (or first matched group)Symbol frequencies table This online calculator builds symbol frequency table for a given messageText file encoding You can use this calculators to encode a text with an encoding.The Discrete Fourier Transform Sandbox This calculator visualizes Discrete Fourier Transform, performed on sample data using Fast Fourier Transformation. By changing sample data you can play with different signals and examine their DFT counterparts (real, imaginary, magnitude and phase graphs)Tone generator The calculator generates different frequency and waveform sound tones.URL-encoded string decoder This converter decodes URL-encoded string (percent-encoded characters). It converts reserved characters as well as UTF-8 charactersUnicode scripts and blocks The calculators for counting number of characters per different Unicode blocks and Unicode scripts for a given text.Unique words count The calculator counts number of unique words in a given text. It also count number of repeated words. It also can remove all the repetitions from the text.VARIANT DATE to datetime string This online calculator converts VARIANT DATE (double) value to datetime string.### Engineering

Air Flow Calibration This calculator is used to set the air flow rate through a grain bin equipped with an aeration fan. It assumes that the air flow can be controlled with baffles, spill gates or variable fan speed. It requires an air flow meter or anemometer. This calculator determines the air speed needed at the top collar of bin in order to achieve the desired air flow rate (CFM/bu Cubic Feet per Minute per bushel).Altitude Pressure This calculator uses barometric formula to find out the pressure at the given altitudeArithmetic progression This online calculator computes the last nth term of arithmetic progression and the sum of the membersArithmetic sequence calculator and problems solver This online calculator solves common arithmetic sequences problems.Baffle Plate Gap Calculator Use this to determine the baffle plate gap in a tank based on your throat size. Measure bell end depth using something the same width as your baffle plate or enter a zero if there is no belled end.The drawing is looking from the top down.Barlow formula Barlow´s Formula is used to calculate the pipe pressure considering its diameter, wall thickness, and hoop stress (in the pipe material).Barometric leveling Binary numbers calculator This calculator supports common mathematical operations over binary numbersBoiling point dependence on the altitude above sea level This online calculator finds the water boiling temperature given the atmospheric pressure in millimeters of mercury.Butterfly Damper Calculator Use this calculator to determine opening area of the damper.Calculation of the volume by weight Calculation of the volume and parameters of regular geometric figure by given mass using density of matter reference book.Calculation of weight by volume Calculating the weight by the volume of material with matter density reference bookCalculation of weight by volume Calculating the weight by the volume of material with matter density reference bookCartesian and polar two-dimensional coordinate systems This online calculator converts polar coordinates to cartesian coordinates and vice versa.Circular Intake/Exhaust Calculator Used to calculate opening area when a circular cover is pivoted over a circular opening.Coillator 3 Density of oil Recalculation of the density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements for the density of oil. The tables for recalculation" standardDerivative It finds one variable function derivative. Step by step differentiation solution is also provided.Determining air humidity with psychrometric method Direct observation error analysis Calculates error of direct measurements for given measured value series and confidence interval.Equilibrium moisture content The calculator gives the wood equilibrium moisture content by given temperature and relative humidity.Film calculator Calculation of the film segment duration in frames, hours, minutes, seconds.Flow Rate and Pressure Drop of Gas Through a Pipeline Calculation of Flow rate of gas through a pipeline.Geometric sequence calculator and problems solver This online calculator solves common geometric sequence problems.Grain Drying with Natural Air Calculator to determine conditions for drying grain.Heat Index This calculator calculates heat index (apparent temperature), which is used by US meteorologists to determine the human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade.Humindex This calculator calculates Humindex, index used by Canadian meteorologists to describe how hot the weather feels to the average person, by combining the effect of heat and humidity.Hyperbolic functions calculator Calculation of hyperbolic functionsInverse Hyperbolic Functions Calculation of inverse hyperbolic functions of given argumentLaminate flooring. The calculation of the number of planks The calculation of the number of planks requieredLiquid level in the tilted cylinder Сalculates the level of the liquid in a tilted cylindrical tank with the tank parameters and the liquid volume.Math equation simplification Simplifies math equation with single variable (x). In eqation you may also use integer and fractional numerical constants arithmetic operations, trigonometric and hyperbolic functions.Mathematical calculator Mathematical calculator is used for evaluation math expressions with arithmetic operations (+-/*^) and functions: sqrt - square root, exp - exponential function, lb - binary logarithm, lg - decimal logarithm, ln - natural logarithm, sin - sine, cos - cosine, tan - tangent, cot - cotangent, sec - secant, csc - cosecant, arcsin - arcsine, arccos - arccosine, arctan - arctangent, arccot - arccotangent, arcsec - arcsecant, arccosec - arccosecant and othersNumber of flagstones for paving This calculator will help you to estimates number of flagstones needed for pavingNumber of flagstones to units of area and vice versa These calculators convert entered number of flagstones to area size and vice versa - calculate number of flagstones needed to cover entered ara size. Metric and imperial units are supportedOne-variable function graph This online calculator plots one-variable function graph given function formula and range of variableOval Tank Volume Calculator Find the volume of oval tanks in cubic inches and gallons.Parallel and perpendicular lines on a plane This online calculator checks lines' slopes to see if they are parallel or perpendicularPetroleum product density Petroleum product density conversion, according to GOST 3900-85Pipe Wall Thickness Pipe wall thickness calculation using Barlow´s formulaPower to the People Power units converter.Prueba2 Relations between the mass, the length, the width and the area density (surface density) of the fabric This online calculator calculates the mass of the fabric given the length, the width and the area density (surface density); the length of the fabric given the mass, the width and the area density; the width of the fabric given the mass, the length and the area density; the area density given the mass, the length and the widthRoot and power This calculator outputs desired root and power of entered numberSecond, third and other derivatives Evaluates first, second third and other derivatives of a single argument functionShipment weight Calculating the weight by the volume of shipment. Created by user's request.Solving limit problems using L'Hospital's Rule Solving 0/0 and ∞/∞ limit problems using L'Hospital's Rule.Square Door Tank Volume Use this calculator to determine tank volume if you've modified the tank for square doors.Square Stack Calculator Due to friction loss when using a rectangular stack, this will calculate the equivalent size of a round stack with the same airflow.Tank Volume Calculators Use one of these to determine your tank's volume.Tank volume Calculator computes tank volume given its length, diameter and walls depth. Created by user's request.The amount of material for the mesh It's required to produce a mesh with predetermined length and width, roughly square meshes from tape with predetermined width. It is necessary to calculate the total length of the tape.Throat Calculator for Cylindrical Tanks Use this calculator to lay out the throat opening on a cylindrical tank, using the throat area from the Pit Calc.Throat Calculator for Overlapping Cylindrical Tanks Use this calculator to determine the throat cut-out when using two cylindrical tanks of the same or different diameter. The cut-out width will always be the same for both tanks. Enter the tank's diameter and the throat area from the Pit Calculator.Throat Calculators The Throat is the opening between the firebox and cook chamber. Enter the area given by the PitCalc and choose a shape that works best for your build.Tilted cylindrical tank volume Calculates volume of cylindrical tank tilted at an angle. To perform calculation you must provide the tank size, angle and liquid level.Trapezoid - Shaped Throat Opening Use this calculator to lay out a trapezoidal shaped throat cut-out. Enter the throat area from the PitCalc, your tank's diameter and dam height.Usable volume of tank This calculator find usable volume of tank, taking into account wall thicknessValues of one-variable function This online calculator calculates values of one-variable function given function formula and set of variable valuesVolume of the cylinder segment Calculates volume of the cylinder segmentWallpaper calculator Amount of cubic meters and amount of rolls of wallpaper as you enter the size of walls and the size of rollsWalls volume This construction calculator calculates volume of four walls of a rectangular building by building length, width, height and thickness of a walls### Finance

Accretion and discounting of annuity payments Bank card number validation The calculator checks a bank card number using Luhn algorithm, it also determines the card issuer according to Issuers handbook.Calculation of payments on corporate property tax Calculation of the tax amount and the amount of advance tax payments in accordance with Chapter 30 of the Russian Federation Tax CodeCommission calculator This online calculator finds the commission from the sale price and the commission rate, the sale price from the commission and the commission rate, and the commission rate from the sale price and the commissionComparing prices using cost per square meter This calculator helps to compare prices by calculating cost per square meterCompound interest This calculator computes compound interestCompound interest at certain number of days Compound interest with an equal monthly investment The calculation of the accumulated amount with the monthly investimentCompound interest. Arbitrary payment Compound interest calculator with the possibilityto set all the parameters of the compound interest formulaCost per unit of volume This online calculator calculates cost per unit of volume (cubic unit) given length, width and height of a stripDeal profitability analysis Deal profitability analysis after paying taxes (VAT and income tax)Discount calculator This online calculator finds the discount from the sale price and the usual price, the sale price from the discount and the usual price and the usual price from the sale price and the discountDollars to rubles and vice versa by Central Bank of Russia exchange rate Effective interest rate Family budget planner The calculator helps to plan personal finances.Inflation in Russia Calculator of Russian inflation since 1991 to the present time. Based on the data of the Federal State Statistics Service of the Russian Federation. The data updated weekly.Interest on the deposit and inflation Labor retirement pension amount (for Russia) Calculates labor retirement pension amount in accordance with the law.Loan payment example Mortgage calculator Mortgage loan early repayment date Calculates the repayment period of the mortgage loan with differentiated payments (Sberbank), depending on the size of the payment.Nominal interest rates сomparison Сalculation of the effective interest rates for a given nominalsPercentage This online calculator gives the percentage of the value. It also calculates the percentage of the sum (e.g. the income tax of the net salary) and the percentage of the difference (e.g. VAT of the gross amount).Price based on running meter This online calculator calculates the price of certain area based on price of running or linear meterProgressive tax Calculates progressive tax according to tax rate table.Real interest rate using Fisher equation This online calculator calculates real interest rate from nominal interest rate with adjustment for inflation using Fisher equationRussian Central Bank Currency Rates Russian Central Bank Currency RatesSimple Interest Calculates simple interestSimple Interest Daily Rate Tax deductions from personal income tax The Central Bank of Russia exchange rate difference The calculation of amortization for tax purposes The methods and procedures for calculating amortization for tax purposes in accordance with Article 259 of the Tax Code, taking into account the changes to the federal law of 27 July 2006 N 144-FZ.Unused leave compensation at dismissal Calculates the payment of compensation for unused leave, envisaged by the labor legislation of the Russian Federation to the dismissal of an employee.When it becomes profitable to pay the tax as a sole proprietor in Russia? The calculator allows you to compare the taxes paid by an sole proprietor in the simplified taxation system and the individual.### Navigation

Beaufort scale Conversion between wind speed measurement units including Beaufort numbers, km/h, m/s, mph, fps.City objects observation The calculator helps to distinguish observed city objects.Compass Points The calculator gives name of compass point by direction angle in degrees.Compass point between two locations Given coordinates of two locations in decimal degrees, this calculator displays constant azimuth, distance and compass points for different compass roses.Compass, magnetic and true course calculator Calculates true, magnetic and compass direction (course, bearing) by a given direction, magnetic declination and deviation.Cost of one hour (or kilometer) Calculation of price per 1 kilometer by user requestCourse angle and the distance between the two points on loxodrome (rhumb line). Calculation of a distance on loxodrome (rhumb line) and course angle (azimuth) between two points with a given geographical coordinates.Course angles and distance between the two point on the orthodrome(great circle) Calculates the distance between two point of the Earth specified geodesic (geographical) coordinates along the shortest path - the great circle (orthodrome). Calculates the initial and final course angles and azimuth at intermediate points between the two given.Distance across the surface vs distance through the Earth This calculator calculates distance across the surface of the Earth and distance through the Earth for given two points, then compares them.Distance between two cities Calculates the distance between the two cities. Uses the directory of geographical city coordinates for the calculation.Distance calculator Calculates distance between two geographic coordinates using haversine formula.Distance through the Earth This calculator calculates the distance from one point on the Earth to another point, going through the Earth, instead of going across the surface.Earth Radius by Latitude (WGS 84) This online calculator calculates Earth radius at given latitude using WGS 84 reference ellipsoidFlag semaphore signals The calculator converts english phrase to the flag semaphore signal sequence.Ford VIN decoder - Line information This calculator tries to extract car line information from supplied 5,6 and 7 positions of VIN numberFuel consumption Calculates fuel quantity consumed by car with given driving given distance.Fuel spent in liters, fuel tanks and money Calculation of fuel spent based on the distance traveled and the average fuel consumption per 100 km, in liters, in fuel tanks and moneyNautical measurement units Nautical mile, sea mile, cablePoints of the compass This online calculator outputs compass point given direction angle in degrees. Different compass roses (4, 8, 16, 32, 128-wind compass roses) are supported.Prospect distance from the ground and line of sight distance between two observers Calculates the prospect distance from height at observer and line of sight distance between two observers.Region determination by the registration plate Tidal gate calculator (Rule of twelfths) This calculator calculates tidal gates using the rule of twelfths, estimating the height of the tide at any time, given only the time and height of high and low water.### Statistics

Analytical performance indicators Calculation of derived analytical indicators of time seriesBernoulli trials table This online calculator calculates probability of k success outcomes in n Bernoulli trials with given success event probability for each k from zero to n.Binomial distribution, probability density function, cumulative distribution function, mean and variance This calculator calculates probability density function, cumulative distribution function, mean and variance of a binomial distribution for given n and pCentered Moving Average This online calculator calculates centered moving average, which is used instead of moving average then number of periods is evenChande momentum oscillator indicator Description of Chande momentum oscillator indicator, drawing a graph on candlesCount to Probability This online calculator takes a list of events along with number of times the particular event occurred and calculates the probability (and log probability) of each event by dividing event count to the total number of events.Covariance calculator This online calculator computes covariance between two discrete random variablesCuba World Development Indicators 2016 - in memory of Fidel Castro This calculator provides access to 752 world development indicators for Cuba imported from World Bank data at 2016. In memory of Fidel Castro.Double exponential smoothing Description and example of the double exponential smoothingEstimated Mean of a Population This online calculator allows you to estimate mean of a population using given sampleEvents timeline This online calculator analyzes and summarizes sequence of events on a timeline. It calculates days passed between events, as well as statistical data, e.g. a mean time between events, a variance and a deviationExponential Moving Average Exponential Moving Average calculation by candlesExponential smoothing Exponential smoothing theoryGeometric Distribution. Probability density function, cumulative distribution function, mean and variance This calculator calculates geometric distribution pdf, cdf, mean and variance for given parametersHistogram Histogram generation according to input data. The number of groups is determined by the Sturgess formula, other formulas or set manuallyHistogram group number Sturges formula and other methods of determining the number of groups in histogram generationHypergeometric Distribution. Probability density function, cumulative distribution function, mean and variance This calculator calculates hypergeometric distribution pdf, cdf, mean and variance for given parametersIndicators of variations Calculation of variation - the coefficient of variation, dispersion, mean square deviation, etc.Lagged scatterplot This online calculator builds scatterplot of the time series against itself offset in timeLog-normal distribution It calculates the probability density function (PDF) and cumulative distribution function (CDF) of long-normal distribution by a given mean and variance.Mann-Whitney test This online calculator performs the Mann–Whitney U test (also called the Mann–Whitney–Wilcoxon (MWW), Wilcoxon rank-sum test, or Wilcoxon–Mann–Whitney test).Negative Binomial Distribution. Probability density function, cumulative distribution function, mean and variance This calculator calculates negative binomial distribution pdf, cdf, mean and variance for given parametersNormal distribution Plots the CDF and PDF graphs for normal distribution with given mean and variance.P-value This online calculator calculates p-value for one sided and two sided tests given the z-scorePaired Sample t-Test This online calculator performs t-Test for the Significance of the Difference between the Means of Two Correlated SamplesPearson correlation coefficient The calculation of the correlation coefficient of two random variablesPoisson Distribution. Probability density function, cumulative distribution function, mean and variance This calculator calculates poisson distribution pdf, cdf, mean and variance for given parametersProbability of given number success events in several Bernoulli trials Gives the probability of k success outcomes in n Bernoulli trials with given success event probability.Seasonal Indices for Quarterly Data This online calculator calculates seasonal indices based on quarterly data using the method of simple averagesSeasonal fluctuations. Seasonal indices. Method of simple averages The study of periodic (seasonal) fluctuations. Calculation of average seasonal indices by the method of simple averages.Simple Moving Averageе Simple Moving Average calculation based on candlesSpearman's correlation coefficient Calculates Spearman's rank correlation coefficientText fitness This online calculator computes text "fitness". That is, how similar the given text to other texts written in English language.Text fitness (version 2) This online calculator calculates measure known as fitness score, of how given text is similar to a typical English text. It uses frequencies of unigrams, bigrams and trigrams to calculate fitness score. The reference frequencies are calculated from Leipzig Corpora Collection and can be downloaded from http://practicalcryptography.com/cryptanalysis/text-characterisation/quadgrams/. The less value you get, the better.Text fitness (version 3) This online calculator calculates measure known as fitness score, of how given text is similar to a typical English text. It uses logarithms of probabilities with normalization to calculate fitness score. The reference frequencies are calculated from Leipzig Corpora Collection and can be downloaded from http://practicalcryptography.com/cryptanalysis/text-characterisation/quadgrams/. The less value you get, the better.Time Series Autocorrelation function (ACF) This online calculator computes autocorrelation function for given time series and plots correlogramTime Series Decomposition This online calculator decomposes time series by extracting seasonality and trend from dataTriple exponential smoothing Description and examples of triple exponential smoothingTwo sample t-Test The calculator to perform t-Test for the Significance of the Difference between the Means of Two Independent SamplesUrn probability simulator This calculator simulates the urn (or box with colored balls) often used for probability problems, and can calculate probabilities of different events.Weighted moving average Weighted moving average calculation by candlesZ-score / Standard score This online calculator computes the standard score of a raw score from the given mean of the population and the standard deviation of the population.Z-score from P-value This online calculator calculates z score from p value### Telecommunications

Morse Code Morse Code translatorMorse code. Mutator Transforms text into Morse code and than changes dots and dashes into specified symbolsNumber of agents in call center The calculator works out number of call center agents using Erlang C formula for given call load and service level.PBX channel number calculation Calculates number of PBX telecommunications channels for given traffic load using Erlang B and Engset algorithmsTelecommunications traffic, Erlang The calculator gives telecom traffic in Erlang for given time span and total call duration.VOIP call bandwidth The calculator works out bandwidth required to handle given number of VOIP calls with given audio codec.### Units converters

Area expression with different units Calculator expresses the given area through the different units of area measurement.Calculation of volume in cubic meters by the size of one unit of output Calculation of volume in cubic meters by the size of one unit of output (by user's request)Conversion between imperial and metric units of area These calculators convert imperial to metric and metric to imperial units of squareConversion between metric units of length and old Russian system of measures units of length The calculators in this article convert units of length from old Russian system of measures units to metric units and back.Conversion of decimal number to other notations This calculator converts decimal number to binary, hexadecimal and octal notationsConversion of fractional numbers between numeral systems This online calculator helps to convert fractional number in one numeral system to fractional number in other numeral system.Conversion of pounds into inches Conversion of old pounds artillery caliber into more modern inches and millimetersConverting degrees to radians Converts radians to degrees, minutes and secondsCubic meters of wood This calculator calculates the volume in cubic meters from unit sizes and number of units and vice versaDegrees-minutes-seconds to decimal degrees conversion and vice versa. This online calculator converts the value of an angle given in the degrees-minutes-seconds to degrees, expressed in decimal fraction and back from decimal fraction to degrees-minutes-seconds.Digital image size in pixels and photo print size This article is about the relation between an image size in pixels and a photographic print size. First, it recommends the photographic print size for given digital image dimensions in pixels. Second, it finds the resulting pixels per inch value for a printed digital image with known linear and pixel dimensions.Display aspect ratio and dimensions This online calculator finds screen dimensions - height, width and area, given the diagonal value and aspect ratio.Exotic length units Converter from exotic length units to metersExpressing length through different units Calculator expresses a given length through the different units.Height in old Russian system of measures This calculator computes height expressed in old Russian measure system units: arshins and vershoksImperial to Metric and Metric to Imperial measures of length converter Inches to pixels and pixels to inches converter This online calculator converts inches to pixels and vice versa given the resolution in pixels per inchMath operations on degrees This online calculator supports simple mathematical operations, addition/subtraction/multiplication/division, on degreesMeters per second and kilometers per hour This simple calculator convert meters per second to kilometers per hour and vice versaMiles per gallon to liters per kilometer fuel consumption converter Converts miles per gallon to liters per kilometer fuel consumptionPlane angles measurement systems Pounds to Kilogramms convertion and vice versa This online calculator can be used for conversion of kilograms to pounds, ounces and grains as they are used in USA or UK.Pressure units converter Calculator which converts units of pressureTon-kilometer. Conversion based on the cost of a kilometer Calculation of a cost of ton-kilometer### Сryptography

A1Z26 cipher A1Z26 is very simple direct substitution cypher, where each alphabet letter is replaced by its number in the alphabet.Atbash cipher This calculator allows you to encrypt and decrypt text with Atbash methodCaesar cipher Calculator encrypts entered text by using Caesar cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.Caesar cipher with numbers This online calculator applies Caesar cipher not only to the letters, but to the numbers as well. Numbers expands the alphabet and are included to the rotations. Other symbols except letters and numbers are not transformed.Gravity Falls Author's symbol substitution cipher decoder This online calculator can decode messages written in the Author's symbol substitution cipherGravity Falls Bill's symbol substitution cipher decoder This online calculator can decode messages written with Bill's symbol substitution cipherIndex of Coincidence This online calculator calculates index of coincidence (IC, IOC) for the given textIsogram checker This online calculator can check if a word/phrase is an isogram.Kasiski test This online calculator performs Kasiski examination of an entered text using trigrams in attempt to discover a key lengthPATHFINDER cipher checker This online calculator decrypts digits encrypted by PATHFINDER type of cipher.Pangram checker This online calculator can check if a phrase is a pangram.Pigpen cipher decoder This online calculator can decode messages written in the pigpen cipherRail fence cipher This article contains two calculators, first can be used to encode message with the rail fence cipher, second can be used to crack message encoded with the rail fence cipher by brute force. Decoded simply outputs decoded message for different number of "rails".Standard Galactic Alphabet decoder This online calculator can decode message written with standard galactic alphabet symbolsSubstitution cipher breaker This online calculator tries to decode substitution cipher without knowing the key. It uses genetic algorithm over text fitness function to break the encoded textSubstitution cipher tool A tool to encrypt/decrypt messages with a simple substitution cipher given as the key. It is also useful for manual cryptanalysis of a substitution cipher - when you have a message written in the English alphabet partially decrypted with an automatic tool and want to tweak the key.Vigenère cipher Calculator encrypts entered text by using Vigenère cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.Vigenère cipher breaker This online calculator tries to decode Vigenère cipher without knowing the key. It uses the index of coincidence technique.

## Study

### Astronomy

Shadow length Gives a vertical object shadow length for given coordinates and time. Also calculates shadow growth during whole day.Sunrise and sunset time This online calculator is intended for sunrise and sunset time calculation for given place and date. The calculator algorithm is obtained from the great book of Oliver Montenbruck and Thomas Pfleger "Astronomy on the Personal Computer".### Chemistry

ABV (Alcohol by volume) This online calculator estimates alcohol by volume (abv) based on original and final specific gravity values.Acid-base titration curves This online calculator builds theoretical titration curves for monoprotic acids and basesAlcohol amount in the aqueous alcohol solution Defines the mass and volume concentration of ethanol in the solution of two liquids with different levels of alcohol.Chemical equation balancer This online calculator balances equations of chemical reactions.Concentration of analyte with uncertainty analysis for replicate titrations This online calculator calculates the molarity of a solution from replicate titrations data. It also performs uncertainty analysis and displays result with the uncertainty.Convert grams to liters and liters to grams This online calculator converts grams to liters and liters to grams given a gas formula. It uses molar volume of a gas at STP (standard temperature and pressure)Convert moles to grams and grams to moles. This online calculator converts to moles given grams and converts to grams given molesConvert moles to liters and liters to moles This online calculator converts to moles given liters of a gas at STP and converts to liters of a gas at STP given molesDilution calculator and problems solver This online calculator can calculate the molar concentration (molarity) of a solute or volume of a solution before or after the dilution.Fertilizing Calculates an additional amount of potassium chloride to achieve the standards when adding other potassium fertilizers.Molar mass of the substance Calculates the molar mass of the substance using atomic mass units from the periodic tableMolar mass of the substance Calculates the molar mass of the substance using atomic mass units from the periodic tableMolar volume This calculator calculates the molar volume of an ideal gas at different conditions (temperature and pressure)Molarity calculator This online calculator can calculate the molar concentration of a solute in a solution, or mass of a solute in a solution with a specific molar concentration.Peptide calculator Peptide calculatorPeptide dissolution calculator Peptides dissolution calculatorPeptides dissolution calculator. Peptides dissolution calculator.Raoult's Second law and the freezing temperature. Calculation of boiling point and crystallization (freezing) of non-electrolyte solutions.pH of a solution calculator These online calculators calculate the pH of a solution. There are two calculators – one for either strong acid or strong base, and another for either weak acid or weak base.### Math

#### Algebra

##### Combinatorics

2D Bin Packing Problem Solver This online calculator tries to solve an offline two-dimensional (2D) bin packing problem using Maximal Rectangles heuristic algorithmBell triangle This online calculator constructs the Bell triangle for the given number of rows.Bin packing problem Calculator solves bin packing problem by different heuristic algorithms. Created at the request of the user.Bin packing problem 2 Calculator solves bin packing problem with different heuristic algorithms and gives you a best. Created at the user's request.Combination By Lexicographical Index This online calculator finds combination by index in lexicographically ordered set.Combinations generator This online calculator generates all possible combinations of items from different sets/listsCombinations of teams This online calculator creates all combinations of teams, so that everyone can play with, and against everyone. It accepts number of players and size of teams, and then generates a list of all teams with all combinations of players.Combinatorial number system This online calculator represents given natural number as sequences of k-combinations, referred as the combinatorial number system of degree k (for some positive integer k), aka combinadicsCombinatorics – combinations, arrangements and permutations This calculator calculates the number of combinations, arrangements and permutations for given n and mCombinatorics. Generator of combinations. Combinatorics. Generator of combinations of m from n.Combinatorics. Permutation generator from N to M with repetitions. Combinatorics. Permutation generator from N to M with repetitions.Combinatorics. Permutation generator from n to m without repetitions Combinatorics. Permutation generator from n to m without repetitionsFactoring calculator This calculator generates all pairs of factors for given integer.Generator of combinations which satisfy a condition For elements with weights this calculator can filter out all combinations where total weight is under the specified limit.Jaccard / Tanimoto coefficient This online calculator measures the similarity of two sample sets using the Jaccard / Tanimoto coefficientMaking up words out of the syllables Calculator sorts out all combinations of syllables to make words. English homework helper.Restricted Growth Strings Generator This online calculator generates restricted growth strings for the given sizeSeating chart This calculator tries to find seating chart combinations taking into account preferences of students.Set partitions generator This online calculator generates all possible partitions of a given set.Stirling numbers of the second kind This online calculator outputs Stirling numbers of the second kind for the given nTeam combinations, with conditions such as team roles and limits This online calculator generates all possible combinations of creating a team using limiting conditions like team roles and limitsTips and tricks #11: Dynamic table columns This article describes how to work with dynamic columns in your calculatorTournament table The calculator performs the participant placement with two following conditions: 1) Each participant must start from each starting position. 2) Each participant must encounter every other participant.##### Number theory

Continued fraction The calculator represents a fraction as continued fractionEgyptian fraction to rational number The calculator converts an Egyptian fraction to the rational number. Egyptian fraction must be entered as integer part and the fraction denominators separated by space.Egyptian fractions The calculator converts decimal number or simple fraction to Egyptian fraction.Fermat primality test The calculator tests an input number by a primality test based on Fermat's little theorem.Miller–Rabin primality test The calculator checks whether or not a number is prime by Miller-Rabin primality testModular arithmetic The calculator performs arithmetic operations modulo p.Modular exponentiation The calculator performs modular exponentiation of big numbers.Prime numbers. Sieve of Eratosthenes The calculator finds prime numbers using "Sieve of Eratosthenes" method.Relation between two numbers Different relations between two numbers. Created by user's requstRoman numerals Converter of Roman numbers and decimal numbers##### Polynomials

Distinct degree factorization The calculator finds distinct degree factors of a polynomial in finite fieldLagrange polynomial calculator This online calculator builds Lagrange polynomial for a given set of points, shows a step-by-step solution and plots Lagrange polynomial as well as its basis polynomials on a chart. Also, it can interpolate additional points, if givenPartial fraction decomposition The calculator decomposes a polynomial fraction to several fractions with a simpler denominator.Polynomial Greatest Common Divisor The calculator gives the greatest common divisor (GCD) of two input polynomials.Polynomial Taylor Shift The calculator evaluates Taylor shift of the given polynomial using Shaw and Traub algorithm.Polynomial factorization The calculator finds all factors of a polynomial with rational coefficientsPolynomial factorization modulo p The calculator finds polynomial factors modulo p using Elwyn Berlekamp algorithmPolynomial factorizaton in finite field The calculator finds factors of a polynomial using Cantor-Zassenhaus algorithmPolynomial factors as formula This supplementary calculator is intended for representation input univariate polynomial factors as math formula.Polynomial fast exponentiation in finite field The calculator raises a polynomial to a power in finite field.Square-free polynomial factorization in finite field The calculator finds all square factors of polynomial in finite field.Synthetic division A simple method of polynomial division.The Newton Polynomial Interpolation This online calculator constructs Newton interpolating polynomial for given data points. The calculator also shows general form and simplified form, interpolates additional points, if entered, and plots a chart##### linear algebra

Characteristic polynomial This online calculator calculates coefficients of characteristic polynomial of a square matrix using Faddeev–LeVerrier algorithmCramer's Rule This online calculator solves system of linear equations using Cramer's rule and shows detailed steps of the solutionDeterminant of a matrix This online calculator computes determinant of a matrix, using it's definitionExtended polynomial Greatest Common Divisor in finite field The calculator computes extended greatest common divisor of two polynomials in finite fieldGaussian elimination in complex numbers Solve complex coefficient linear equation system.Inverse matrix calculator This online calculator finds inverse matrix via adjugate matrixMatrix Multiplication Matrix MultiplicationMatrix Rank This online calculator determines the rank of a given matrixMatrix Transpose Matrix TransposeMatrix triangulation calculators Matrix triangulation using Gauss and Bareiss methods.Modular inverse of a matrix This calculator finds the modular inverse of a matrix using adjugate matrix and modular multiplicative inversePolynomial addition /subtraction The calculator performs polynomial addition or subtractionPolynomial math The calculator evaluates a polynomial expression. The expression contains polynomials and operations +,-,/,*, mod- division remainder, gcd - greatest common divisior, egcda, egcdb, lc, deg, pp, content, monic functions.Reduced Row Echelon Form (RREF) of a matrix calculator This online calculator reduces a given matrix to a Reduced Row Echelon Form (rref) or row canonical form, and shows the process step-by-stepResultant The calculator gives the resultant of two univariate polynomials. It also displays Silvester matrix.Solution of nonhomogeneous system of linear equations using matrix inverse The solution of a nonhomogeneous system of linear equations using matrix inverseThe discriminant This online calculator calculates the discriminant of the quadratic polynomial, as well as higher degree polynomials

##### Others

Area de la Sombra de un Objeto El área de la sombra se refiere a la de un objeto cuadrado o rectangular.Bisection method The bisection method in mathematics is a root-finding method that repeatedly bisects an interval and then selects a subinterval in which a root must lie for further processing. The method is also called the interval halving method.Collinearity This online calculator finds if points are collinear given their coordinatesCompleting the square This online calculator allows you to use completing the square technique to complete the square.Complex numbers The calculator displays complex number and its conjugate on the complex plane, evaluate complex number absolute value and principal value of the argument . It also demonstrates elementary operations on complex numbers.Complex polynomial value calculation The calculator evaluates polynomial value. The polynomial coefficients can be either real or complex.Determinant by Gaussian elimination Finding matrix determinant using Gaussian elimination in complex, rational or real numbers.Determinant of 3x3 matrices This calculator calculates the determinant of 3x3 matricesEigenvalue calculator This online calculator computes the eigenvalues of a square matrix up to the fourth degree by solving the characteristic equation.Eigenvector calculator This online calculator computes the eigenvectors of a square matrix up to the 4th degree.Evaluating expressions This online calculator substitutes a specific value for each variable, and performs the operations, evaluating the given expression.FOIL Calculator This online calculator shows steps to multiply two binomials using the FOIL method (or the FOIL mnemonic)Factoring trinomials This is factoring trinomials calculator, in other words, the calculator which can factor trinomials given the three terms of the trinomial.False position method The false position method is a root-finding algorithm that uses a succession of roots of secant lines combined with the bisection method to approximate a root of a function f.Geometric progression This calculator computes n-th term and sum of geometric progressionGeometric progression. The common ratio and the first term Finding the common ratio and the first term the geometric progression for two adjacent terms.Hill cipher This calculator uses Hill cipher to encrypt/decrypt a block of textInteger factorization. Trial division Integer factorization using trial division algorithm.Linear approximation This online calculator derives the formula for the linear approximation of a function near the given point, calculates approximated value and plots both the function and its approximation on the graphModular Multiplicative Inverse This calculator calculates modular multiplicative inverse of an given integer a modulo mNewton's method This online calculator implements Newton's method (also known as the Newton–Raphson method) for finding the roots (or zeroes) of a real-valued function.Polynomial division This calculator divides one polynomial by another polynomial.Polynomial multiplication This calculator multiplies two univariate polynomials.Polynomial power expansion The calculator expands n-th power of a given polynomial.Polynomial root isolation The calculators isolates real roots of the input univariate polynomial using Sturm and VAS-CF methods.Polynomial roots The calculator solves polynomial roots of any degree. For small degree polynomials analytic methods are applied, for 5-degree or higher the polynomial roots are estimated by numerical method.Quartic equation solution This calculator produces quartic equation solution using resolvent cubic.Secant method The secant method is a root-finding algorithm that uses a succession of roots of secant lines to better approximate a root of a function f.Solution of a system of 3 linear equations Solution of a system of 3 linear equations with 3 variablesSolution of buckets and tank problem This online calculator find a solution to the question how to fill tank with certain amount of water using two buckets of different sizeSolution of quadratic equation Solution of quadratic equation, including complex rootsSolving a system of equations of first degree with two unknowns This calculator solves a system of equations of first degree with two unknowns.Squarefree polynomial factorization The calculator extracts square factors from the input polynomial.Stirling's approximation of factorial Online calculator computes Stirling's approximation of factorial of given positive integer (up to 170!)The rational number as a fraction This online calculator writes the rational number as a fraction (the ratio of two integers), using the formula of infinite geometric sequence.nth root algorithm This online calculator implements nth root algorithm to find the principal nth root of a positive real number.#### Applied mathematics

#### Geometry

3d coordinate systems Transforms 3d coordinate from / to Cartesian, Cylindrical and Spherical coordinate systems.Altitude of a triangle This online calculator computes the altitude length of a triangle, given the lengths of sides of a triangle.Angle between two vectors This online calculator finds the angle between two vectorsAngle bisector of a triangle This online calculator computes the length of angle bisector given the lengths of triangle edgesAngular size, linear size and distance These calculators computes value of angular size or linear size or distance from the other two'sApparent length from angular size This online calculator converts angular size of distant object to its apparent length, or, in other words, the length of obstacle needed to block that distant object from view, if obstacle placed at some known distance before our eyes.Arc length calculator This universal online calculator can find arc length of circular segment by radius and angle, by chord and height and by radius and height.Area of a Rectangle by the length of one side and the diagonal This online calculator finds the area of a rectangle from the length of one side and the diagonal.Area of a convex quadrilateral. Example of creating a calculator. This online calculator calculates area of a convex quadrilateral given diagonal values and value of angle between them. Article also describes the process of creating a calculator.Area of a quadrilateral This article lists several calculators to compute the area of a quadrilateralArea of a triangle This is universal online calculator for the area of a triangle which uses different methods to find the area of a triangle, depending on your knowledge of the triangle.Area of an irregular quadrangle with the given sides Calculates an area of an irregular quadrangle with the given sidesArea of rectangle by coordinates This online calculator calculates area of convex quadrilateral (rectangles too) given coordinates of four vertices (corners)Area of triangle by coordinates This calculator determines the area of a triangle using its vertex coordinates in the cartesian coordinate system.Ball radius calculated by volume Calculate radius from area This online calculator calculates a radius of a circle from the given area of a circleCalculator of area of a triangle using Hero's formula Circle formulae Circle formulaeCircular sector Calculates area, arc length, perimeter, and center of mass of circular sectorCircular segment Can calculate area, arc length,chord length, height and perimeter of circular segment by radius and angle.Circumcircle of a triangle This online calculator determines the radius and area of the circumcircle of a triangle given the three sidesCollinearity of vectors in 2d space This online calculator determines if 2d space vectors are collinearCone Cone development Calculator of right circular cone / truncated right circular cone developmentCounting pipes from the end face The approach to the calculation of the number of nested circles of smaller radius at a known length of the describing circle of a larger radius. Created by user requestCross product calculator This online calculator computes the cross product (or vector product) and visualizes the result in a cartesian coordinate system.Cube Cutting a circle Two ways to cut a circle into equal parts : sector cuts and parallel cuts.Cylinder Cylindrical Tank Volume Calculator Use this calculator to determine your cylindrical tank volume in cubic inches and gallons even if one or both ends are rounded. Especially useful if you've cut the tank in length. If you've got a flat end just leave it blank or enter 0.Cylindrical tank volume Cylindrical tank volumeDot product This online calculator calculates the dot product of two vectorsEllipsoid Calculates ellipsoid and spheroid volume and surface area.Equation of a circle passing through 3 given points This online calculator finds equation of a circle passing through 3 given pointsEquation of a line passing through two points in 3d This online calculator finds equation of a line in parametrical and symmetrical forms given coordinates of two points on the lineEquation of a plane passing through three points This online calculator calculates the general form of the equation of a plane passing through three pointsEquations of a circle with given center and radius in different forms This online calculator displays equations of a circle in standard form, in parametric form and in general form given center and radiusEquilateral triangle This online calculator calculates characteristics of the equilateral triangle: the length of the sides, the area, the perimeter, the radius of the circumscribed circle, the radius of the inscribed circle, the altitude (height) from single known valueFind the distance and midpoint between two points This online calculator finds the distance and midpoint between two points in cartesian coordinates.Find the intersection of two circles This online calculator finds the intersection points of two circles given the center point and radius of each circle. It also plots them on the graph.Function graphs The calculator plots several function graphs on the single coordinate plane.Hip roof calculator This calculator will help you estimate hip roof parameters, including rafters and roof areaHow many circles of radius r fit in bigger circle of radius R This calculator estimates how many circles of radius r can be placed inside another circle of radius R.Incircle of a triangle This online calculator determines the radius and area of the incircle of a triangle given the three sidesInverse trigonometric functions This calculator determines values of inverse trigonometric functions (arcsine, arccosine, arctangent, arccotangent, arcsecant, arccosecant) and outputs it with different measurement units (degrees, radians, minutes, etc)Involute of an angle Involute of an angle calculator and finding an angle by the given involute.Is a point in a triangle? The calculator determines if an arbitrary point lies inside 2D triangle. The triangle is defined by 3 cartesian coordinate pairs.Isometric projection of a vector This online calculator draws isometric projection of a vector, giving its coordinates in 3D space.Lengths of triangle sides given one side and two angles This online calculator determines lengths of triangle sides given one side and two anglesLevel of liquid in the cylindrical tank, AKA Quarter-Tank Problem This online calculator finds the height above the bottom of a horizontal cylinder (such as a cylindrical gas tank) to which the it must be filled for it to be full at specified percentage (for example, one quarter full amounts)Magnitude of a Vector This online calculator calculates the magnitude of a vectorMedian of a triangle This online calculator computes the median of a triangle given triangle sidesPipe cold bending. Flexure depth with main shaft. Calculates the section flexure depth with pipe bender or bending machine to obtain given parameters.Polygon area An online calculator calculates a polygon area, given lengths of polygon sides and diagonals, which split polygon to non-overlapping triangles.Pythagorean theorem calculator Calculates the side length of a right triangle from two other sides using Pythagorean theorem. Created by user's requestRectangle area calculation by perimeter Rectangle area calculation with known perimeter and aspect ratioRectangle intersection This online calculator displays result of intersection of two rectanglesRegular polygon area from circumcircle Calculates the area of the circumcircle and of the regular polygon from radius of circumcircle and number of sidesRegular polygon, number of sides and length of side from incircle and circumcircle radii This online calculator finds number of sides and length of side of regular polygon given the radii of incircle and circumcircleRegular polygon. Incircle and circumcircle This online calculator determines parameters of circumcircle and incircle of a regular polygonSide length of a triangle This calculator computes side length of a triangle given two sides and angle between them (law of cosines)Side length of the regular polygon Calculates the side length of the regular polygon circumscribed or inscribed to a circle. Created by user's requestSide of regular polygon from polygon area Calculates the side length of regular polygon given the area of the regular polygon and number of sidesSine wave calculator Construction of a sine wave with the user's parametersSphere Spherical cap and spherical segment This calculator computes volume and surface area of spherical cap and spherical segmentSpherical sector Calculates surface area and volume of Spherical sector by radius and heightThe diagonals of a parallelogram Calculator computes the diagonals of a parallelogram and adjancent angles from side lengths and angle.Total square This calculator calculates total square as sum of squares of entered rectanglesTotal volume This calculator calculates total volume as sum of volumes of entered rectangular parallelepipeds.Triangle angles for given triangle sides This calculator computes triangle angles for given triangle sides using cosine lawTrigonometric functions This online calculator computes the values of elementary trigonometric functions, such as sin, cos, tg, ctg, sec, cosec for an angle, which can be set in degrees, radians, or grads.Two argument arc tangent The calculator gives an angle between positive axis x and the ray to the given point from point 0. The result corresponds to atan2 function, implemented in many computer languages and math libraries.Vector Addition Calculator This online calculator performs vector addition and displays vectors and vector sum graphically.Volume of a sphere This online calculator can find volume of a sphere by radius, and radius by volume of a sphereVolume of liquid in a tilted tank with hemispherical heads Calculates volume of liquid in an inclined cylindrical tank with hemispherical ends.Volume of the hemisphere cut at an angle Volume of hemisphere asymmetrically cut by a flat plane under a given angle.#### mathematical analysis

The limit of the function at the given point This calculator calculates the limit of the function at a given point numerically. It calculates the limit of the function well as x approaches to the specified value. It's not suitable for calculating the limits when x goes to infinity.

#### Others

Antilogarithm Antilogarithm calculatorBayes’ theorem This online calculator calculates posterior probabilities according to Bayes’ theorem.Bézout coefficients This online calculator computes Bézout's coefficients for two given integers, and represents them in the general formComplex fraction This online calculator evaluates arithmetic expressions with common or complex fractions.Cryptarithmetic puzzle solver This calculator is a solver of cryptarithmetic puzzles. A cryptarithmetic puzzle is a number puzzle in which a group of arithmetical operations has some or all of its digits replaced by letters or symbols, and where the initial digits must be found. In such a puzzle, each letter represents a unique digit.Cubic equation Solution of cubic equation using Vieta's formulae. Created by user requestCurve fitting using unconstrained and constrained linear least squares methods This online calculator builds a regression model to fit a curve using the linear least squares method. If additional constraints on the approximating function are entered, the calculator uses Lagrange multipliers to find the solutions.Egyptian numbers The calculator displays a number in ancient Egypt hieroglyphs. Multiple numbers are recognised as Egyptian fraction.Euler method This online calculator implements Euler's method, which is a first order numerical method to solve first degree differential equations with a given initial value.Explicit Runge–Kutta methods This online calculator implements several explicit Runge-Kutta methods so you can compare how they solve first degree differential equation with a given initial value.Extended Euclidean algorithm This calculator implements Extended Euclidean algorithm, which computes, besides the greatest common divisor of integers a and b, the coefficients of Bézout's identityFactorial This online calculator calculates factorial of a positive integer. Practically unlimited positive integer. In fact, it is limited only by the time you are willing to wait until calculation completes. I was patient enough to wait for 100000!Fixed-point iteration method This online calculator computes fixed points of iterated functions using the fixed-point iteration method (method of successive approximations).Fraction Simplifier This online calculator simplify the entered fraction using the greatest common factor (GCF)Fraction to Decimal and Decimal to Fraction converter This online calculator determines the decimal value for the entered fraction and fraction value for the entered decimalFraction to Percent and Percent to Fraction converter This online calculator determines the percent value for the entered fraction and the fraction value for the entered percentFunction approximation with regression analysis This online calculator uses several regression models for approximation of an unknown function given by a set of data points.Gamma function Calculation of the Gamma function using Lanczos approximationGaps and missing numbers finder This online calculator helps you find gaps and missing numbers in a sequence of numbersGaussian Method for system of linear equations with any number of variables. The calculator solves the system of linear equations using Gaussian Method.Gaussian elimination The calculator solves the systems of linear equations using the row reduction (Gaussian elimination) algorithm. The calculator produces step by step solution description.Gaussian elimination with fractions This online calculator solves systems of linear equations using row reduction (Gaussian elimination) while retaining fractions on all calculation stages. At the end, it returns the results in two forms - as a floating point numbers and as a fractions (with numerator and denominator)Golden ratio This calculator determines proportions according to golden ratioLeast Common Denominator for several fractions Least Common Denominator for several fractionsLevenshtein Distance Online calculator for measuring Levenshtein distance between two wordsLine equation from two points This online calculator finds the equation of a line given two points it passes through, in slope-intercept and parametric formsLinear Diophantine equations This calculator solves linear diophantine equations.Liquid volume in rectangular tank The calculator gives the liquid volume in a partially filled rectangular tank, pitched and turned by the given angles.Logarithm This online calculator produces the logarithm of a given number with a given base. It computes also the natural logarithm and the common logarithm (decimal logarithm).Luhn algorithm Calculates digit sequence checksum using Luhn algorithm (mod 10), calculates validation digit (the digit to be appended to the digit sequence to make whole sequence checksum equal to zero).Math equation syntax Math equation samples.Math worksheets generator for elementary school Random worksheets, which are generated automatically from user parameters.Mathematical competition tasks Calculator solving some mathematical competition taskMean, variance and standard deviation of discrete random variable This online calculator calculates the mean, variance, and standard deviation of random variables entered in the form of a value-probability table.Midpoint method This online calculator implements a direct midpoint method AKA modified Euler method, which is a second-order numerical method to solve a first-degree differential equation with a given initial value.Mod calculator This online calculator performs modulo operation on integers and on doubles as well (because it just returns reminder of division)Multiplication in columns Calculator shows results of multiplying in columns, can be used to check answersNoisy function generator This online calculator takes function, calculates its values for given range and then adds some random noise to distort original values.Number approximation as a sum of unit fractions The calculator approximates a fractional number with a sum of unit fractions (a unit fraction numerator is one). The unit fraction denominator is a number which is less than the base times the base in integer non negative power.Numeric complements This online calculator calculates radix complement and diminished radix complement for given number and radix.Numerical integration To calculate definite integral by the rectangle method, trapezoid method, Simpson method or other Newton-Cotes quadrature methods.Proportion This online calculator finds unknown member of proportion. Created by user's requestQuick Sum Calculator This online calculator sums up entered integer numbers. Any symbol what is not a digit, for example, a space, a comma, a semicolon, etc, serves as a separator. It is useful when you need to sum up several numbers but do not have speadsheet program at hand.Race Heat Calculator This online calculator generates grid positions for specified number of heats and entrants of kart racing. It tries to make them as fair as it could by harnessing computer processing power to find best combinations.Random combination of numbers from specified range This calculator randomly picks several numbers from specified range.Random matrix generator This online calculator generates a random matrix with specified parameters like a dimension, a range of values, a type of numbersRange finder This online calculator analyzes integer number sequence and prints all continuous ranges it detectsRunge–Kutta method This online calculator implements the Runge-Kutta method, a fourth-order numerical method to solve the first-degree differential equation with a given initial value.Scientific notation The calculator converts a number to the normalized scientific notation also known as standard form.Spiral calculator This online calculator computes unknown archimedean spiral dimensions from known dimensions. The spiral dimensions include: outer diameter, inner diameter, separation distance (distance between arms, thickness), spiral length, number of turningsStudent t-distribution Calculates cumulative distribution function value and probability density function value for Student t-distribution. Quantile calculator evaluates Student quantiles for given probability and specified number of degrees of freedom.Sum of Partial Sums of Arithmetic Sequence This online calculator calculates partial sums of an arithmetic sequence and displays the sum of partial sums.Sum of Partial Sums of Geometric Sequence This online calculator calculates partial sums of geometric sequence and displays sum of partial sums.Surface area of a cube The Greatest Common Factor of several numbers This online calculator finds the greatest common factor of several numbers (two or more).The greatest common divisor and the least common multiple of two integers This calculator finds the greatest common divisor (GCD) and the least common multiple (LCM) of two integersThe greatest common divisor of two integers This calculator determines the greatest common divisor of two integers using Euclidean algorithmTips and tricks #12: Long (infinite) calculations This article describes how to perform long or infinite calculations while allowing user to stop themTips and tricks #8: How to reuse existing calculator This article describes process of reusing another calculator's logic (algorithm) in your calculator.Tips and tricks #9: Big numbers How to use big number input and PCR library.Torus Volume and surface area of torus.Volume of geometric shapes Calculates volume of geometric shapes: cube, prism, pyramid, frustum, cone, cylinder, sphere, ellipsoid.Сomputer algebra Derives a formula from input formulas and input data to calculate remained parameters### Physics

Acceleration of gravity Acceleration of gravity calculation on the surface of a planet. It's possible to calculate the acceleration above the surface by setting the sea level. But it won't be possible under the surface - this is a wrong formula.Angular velocity and linear velocity This online calculator converts angular velocity to linear velocity for given radiusApparent temperature This online calculator computes the apparent temperature, taking into consideration wind speed and relative air humidity. It uses the Australian Bureau of Meteorology formulaAverage Compressibility Factor, (dimensionless) Is the average compressibility factor of the gas flowing through the pipelineAverage Pressure, psia This is the average pressure in the pipeAverage Temperature, °R Average temperature in the pipelineBattery discharge time depending upon load This article contains online calculators that can work out the discharge times for a specified discharge current using battery capacity, the capacity rating (i.e. 20-hour rating, 100-hour rating etc) and Peukert's exponent.CaCl2 ppm to chlorides WPS ppm converter This online calculator converts given CaCl2 ppm concentration into chlorides water phase salinity ppm concentrationCapacitor in Direct Current Circuit These online calculators computes various parameters for charging and discharging the capacitor with the resistorCelsius to Fahrenheit calculator explained Centripetal force This online calculator calculates unknown parameter in the centripetal force formula, whether force, mass, radius or speed.Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure. Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure.Complementary color This calculator shows complementary colors for entered colorsCoulomb's law This online calculator calculates unknown (whether force, charge, or distance) using known values using Coulomb's law scalar formula. It can be used to solve physics problems.Dew point This calculator determines dew point from given temperature and relative humidity of airDoppler Effect in sound Calculation of frequency and wavelength change for a moving sourceElectricity, Work, and Power This online calculator can help you solve the problems on work done by the current and electric power. It can calculate current, voltage, resistance, work, power and time depending on what variables are known and what are unknownEnergy measurement units Energy unit converter (joules, kilowatt-hour, kilogram force per meter, horsepower per hour, kilocalories)Free fall. Distance passed task. Solution of the falling body and distance passed tasks.Humidification loads This online calculator answers question "how to choose" humidifier, by calculating humidification requirements given initial and target relative humidity and building parametersHydrostatic pressure This online calculator can solve hydrostatic pressure problems by finding unknown values in the hydrostatic equation.Kinematic Equations for Uniform Acceleration This calculator will help you to solve uniform acceleration problems using kinematic equationsKinematics. Throwing body up problem Kinematics problem from the Svetozarov's book for MEPI matriculatesNormal force This online calculator calculates the normal force's strength from the object's mass, the gravitational field strength, and the inclined surface's angle measured from the horizontal.Ohm's law This calculator determines current by voltage and resistance using ohm lawPower into torque, and vice versa This online calculator turns power into torque and vice versaPressure over a surface This online calculator computes pressure, cause by given mass over given surface in gravity field. Result is displayed using different units of pressureProjection Calculation of unknown parameters of projection using known parameters. Parameters are duration, maximum height, distance, initial velocity and angle.Quantity of heat This calculator can find missing values in the relationship between heat and temperature: heat added or removed, specific heat, mass, initial temperature and final temperature.Relative humidity to absolute humidity and vice versa calculators The first calculator converts relative humidity to absolute humidity for a given temperature and barometric pressure. The second calculator converts absolute humidity to relative humidity for a given temperature and barometric pressureSaturation vapour pressure This online calculator computes saturation vapour pressure for given temperature and atmospheric (barometric) pressureSound Speed in Gases This online calculator computes speed of sound in an ideal gas.Space object velocity It calculates the circular orbital velocity, escape velocity and planetary system escape velocity for the given planet parameters.Surface tension. Weight and volume of the drop of liquid This online calculator calculates the weight and the volume of the drop given the surface tension, diameter of the capillary tube, and density of the liquidTemperature scales Conversion between different temperature scalesThe buoyant force This calculator computes the buoyant force and weight of the liquid displaced, given the volume of a body in waterThe waves and the wind. Calculation of wave characteristics Calculation of wave characteristicsThe waves and the wind. Wave height statistical forecasting Predicting the height of the waves depending on the wind strengthThermodynamics – calculator for solving mixing problems An online calculator to solve thermodynamic equilibrium problems, such as finding the final temperature when mixing fluids, or finding the required temperature for one of the fluids to achieve a final mixed temperatureTips and tricks #5: How to show/hide input and output controls in a calculator This article describes how to control visibility of input and output controls in a calculatorTraveling Wave Relationship The relationship of the wave frequency, wavelength and propagation velocity.Wind Chill Index This online calculator computes Wind Chill Index using Wind Chill Formula from Environment CanadaWind energy and wind power This online calculator computes kinetic energy of wind and wind powerp-t Graph Analysis This online calculator analyses position vs time table, which is often used to describe 1-D kinematics motion.Сonstant acceleration This online calculator solves problems with constant acceleration. It finds unknown parameter, either initial velocity, final velocity, time or acceleration, from known parameters.

### Others

PSAT/NMSQT Practice Tests Score Calculator This calculator helps you to score your official practice tests results.Universal High School GPA Calculator This online calculator lets you figure out your high school GPA. Even more, it provides you with editable conversion tables and weights, so you can tweak calculations in case you need it.

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Apartment sale tax Apartment sale tax |

Apartment sale tax in Russia Apartment sale tax in Russian federation according to 2017 legislation changes |

Average wage сalculation (for Russia) The calculator calculates the average wage, according to the decree of the Russian Federation government dated December 24, 2007 "On specifics of calculation of average wages" in edition of Russian Federation Government Resolution dated November 11, 2009. |

Calculadora Blogger Post Calculadora Blogger Post |

Land tax Calculates the land tax |

New customs duties on import of cars by individuals It calculates the amount of customs duties for the price, age and engine capacity of the car. |

Old Russian money Converts old Russian monetary units into more common rubles and kopecks. Created by user's request. |

Russian text typed in English letters Restores the Russian phrase, accidentally typed on the English keyboard layout. |

Text file decoder Using this calculator you can decode and read a text file in some encoding. |

Tips and tricks #10: Files, long calculation mode The article describes how to use input and output files in Planetcalc calculators |

Tips and tricks #1: How to set output value This article describes process of calculator creation and how to set output value. |

Tips and tricks #2: How to make calculator translatable into different languages This article describes the process of adding translation support to the calculator, so it can be translated into different languages. |

Tips and tricks #3: How to make calculator with custom errors This article describes the process of adding custom errors to the calculator |

Tips and tricks #4: How to make calculator with table output This article describes how to make calculator which outputs results in table format |

Tips and tricks #6: How to make calculator with virtual keyboard This article describes how to create calculator with virtual keyboard using SVG image |

Tips and tricks #7: How to make calculator with SVG image map This article describes how to create calculator with image map using SVG image |

UTF-8 encoded string The calculator converts an input string to a UTF-8 encoded binary/decimal/hexadecimal dump and vice versa. |

Wage payment delay compensation It calculates the amount of monetary compensation, which the employer must pay the employee for the delay of wages or other payments, according to the Russian Federation Labour Code. |

Wordpress plugin With Planetcalc plugin for Wordpress you can easily insert any planetcalc calculator in your wordpress-based site or blog pages. |

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