Discount Calculator

About this tool

A discount is a percent of the original price. This tool finds the sale price, reconstructs the original from a sale sticker, or works out the percent off when you know both prices.

How to use

1. Choose whether you need the sale price, the original price, or the discount percent.
2. Enter the numbers you already have.
3. Read sale price, savings and the discount percent.

Formula and methodology

Sale = original × (1 − percent/100). Original = sale ÷ (1 − percent/100). Percent off = (original − sale) ÷ original × 100. A 100% discount cannot reconstruct an original price, and a sale above the original is rejected.

Worked example

20% off 2,499 is a 499.80 saving and a 1,999.20 sale price. A 1,999 sale at 20% off implies an original of 2,498.75.