Discount Calculator

How discounts work

Multiply the original price by the discount percentage divided by 100 to get the saving. Subtract that from the original price to get the sale price. A 30% discount on £80 saves £24, giving a final price of £56.

Finding the original price

Divide the sale price by (1 minus the discount as a decimal). If something costs £56 after a 30% discount, the original price was £56 ÷ 0.7 = £80. This is useful when you only know the discounted price and want to work backwards.

Stacking multiple discounts

Stacking discounts means applying them one after another, not adding them together. A 20% discount followed by a 10% discount is not 30% off — it’s 20% off first, then 10% off the reduced price. The total discount works out to 28%, not 30%.