How it works
Sale price = original price × (1 − discount ÷ 100).
A worked example
25% off an 80 price saves 20 and gives a final price of 60.
What to keep in mind
A single percentage discount. Shipping, additional taxes and stacked offers are excluded.
How to calculate a discount
Multiply the original price by the discount percentage and divide by 100 to get the saving, then subtract the saving from the original price. For 25% off £80, the saving is £20 and the sale price is £60.
Quick percentage-off examples
10% off £50 is £45. 20% off £60 is £48. 30% off £120 is £84. 50% off £35 is £17.50. A shortcut: the sale price equals the original price multiplied by (100 minus the discount) ÷ 100, so 20% off is the same as multiplying by 0.8.
Stacked discounts are not added together
An extra 10% off an item already reduced by 20% is not 30% off. The second discount applies to the reduced price: £100 becomes £80, then £72, which is 28% off in total. Run the calculator twice to work out stacked offers.
Frequently asked questions
How do I work out 20% off?
Multiply the price by 0.8. For example, 20% off £45 is £36.
Does a second discount add to the first?
No. Successive discounts apply to the already-discounted price. Run the second discount on the first result.
How do I find the original price before a discount?
Divide the sale price by (1 − discount ÷ 100). For example, £60 after 25% off was originally £60 ÷ 0.75 = £80.
How do I find what percentage off something is?
Divide the saving by the original price and multiply by 100. Use the percentage change calculator to do this automatically.
Results use the assumptions above. Check critical measurements and dates independently.