Discount Calculator
Calculate the sale price and how much you save online free. Free online discount calculator for % off, stacked extra discounts, sales tax and original price.
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Part of the toolkit
How to use Discount Calculator
- 1Choose Sale price to find the price after a discount, % off to find the discount from two prices, or Original price to work backwards
- 2Enter the price and discount — tap a quick button like 20% off or 50% off
- 3Optionally add an extra stacked discount, sales tax and quantity; the final price and your savings update instantly
Frequently asked questions
How do I calculate a discount?▾
Multiply the price by the discount percentage and subtract it: 25% off 80 is 80 × 0.25 = 20 off, so you pay 60. Equivalently, multiply by (1 − 0.25).
Is 20% off plus an extra 20% off the same as 40% off?▾
No. Stacked discounts apply one after the other: 20% then another 20% leaves 0.8 × 0.8 = 64% of the price, which is 36% off in total — not 40%.
Is sales tax added before or after the discount?▾
In most places sales tax is charged on the discounted price, which is how this calculator works.
How do I find the percent off from two prices?▾
Divide the sale price by the original price, subtract from 1 and multiply by 100. From 80 down to 60 is (1 − 60/80) × 100 = 25% off.
How do I find the original price before a discount?▾
Divide the sale price by (1 − discount). If something costs 60 after 25% off, the original price was 60 ÷ 0.75 = 80.
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