ConvertThemAll

Discount calculator

See what you pay and what you save, or how big a discount really is.

Formula Everyday

%

%

Applied after the first discount, as shops do with “an extra 10% off”.

You pay

You pay: US$60.00

You save
US$20.00
Total discount
25%
PaidUS$60.00
You saveUS$20.00

How it works

A discount of P% means you pay (100 − P)% of the price. Multiply the price by (1 − P ÷ 100) to get the sale price.

Two discounts in a row multiply; they do not add. 25% off and then an extra 10% off is a total of 32.5% off, not 35%.

To find the percentage off, divide the amount saved by the original price.

Formula

Sale price = price × (1 − P ÷ 100) × (1 − extra ÷ 100)
Saved = price − sale price
% off = saved ÷ price × 100

Worked example

A jacket costs 80 with 25% off: 80 × 0.75 = 60, so you save 20. With an extra 10% off, you pay 60 × 0.9 = 54, a total discount of 32.5%.

Questions people ask

Is 20% off plus 20% off the same as 40% off?

No. The second discount applies to the reduced price, so the total is 1 − 0.8 × 0.8 = 36% off.

Is sales tax or VAT included?

This calculator works on whatever price you enter. Where tax is added at the till, use the sales tax calculator on the sale price afterwards.