What is PlanetCalc?

Planetcalc is a free online calculator collection.

Online calculator - A simple program, located in Internet web pages to perform mathematical calculations.


Planetcalc contains 983 online calculators. You can leave a new online calculator request here. If you describe your requirements in detail, one of Planetcalc’s authors can create the calculator for you. Any Planetcalc online calculator can be installed on your website.

Planetcalc authors

117595 users registered on Planetcalc. 151 of them became authors. To become a Planetcalc author, please provide one of the following:
  • Create a new calculator.
  • Write a calculator description article.
  • Translate the calculator, article or site interface into (or from) a foreign language.
Here you can find information about a new calculator development..

Our plans

  • Implement more online calculators.
  • Improve calculator editor.
  • Translate site interface into other languages.
  • Create Android and iOS applications.

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Online calculator sample

PLANETCALC, Days between two dates

Days between two dates

Download on the App StoreGet it in Google Play
Years, Months, Days

Commercial services

Premium account distribution, author promotion, project development

Planetcalc LLC runs commercial services for Planetcalc.

TIN: 7743872163

Russia, 125445, Moscow, Smolnaya st., 24A, office 702