This online calculator illustrates the concept of discount as "a reduction in the usual price for something" (according to Cambridge Dictionary). A discount is usually given in percents. You can find all formulas below the calculator.
How to calculate discount
Thus said, a discount is a reduction in the usual price for something
Often discount is given as a percentage of the usual price. There are three parameters to find: a regular price, a sale price, and a discount.
To find the discount in percents from the given regular price and sale price use this formula:
To find the regular price from the given sale price and the discount percent, use this formula:
To find the sale price from the given regular price and the discount percent, use this formula: