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# 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 discount

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This online calculator illustrates concept of discount as of "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.

### Discount calculator

Digits after the decimal point: 2
Sale Price

Usual Price

Discount

## How to calculate discount

Thus said, a discount is a reduction in the usual price for something $Discount=Usual Price - Sale Price$

Often discount is given as percentage of 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:
$Discount = 100 * \frac{Usual Price - Sale Price}{Usual Price}=100(1 - \frac{Sale Price}{Usual Price})$

To find the regular price from the given sale price and the discount percent, use this formula:
$Usual Price = \frac{Sale Price}{1 - \frac{Discount}{100}}$

To find the sale price from the given regular price and the discount percent, use this formula:
$Sale Price = Usual Price * (1 - \frac{Discount}{100})$