Percentage Off Calculator

“Percentage off” is the everyday wording for a markdown: 25% off a jacket, 10% off a bill. This calculator uses the same maths as the discount tool, written for that shopping question: what do I pay, and how much do I save?

The percentage off formula

Amount off = Original × (P ÷ 100). Sale price = Original × (1 − P ÷ 100).

How to calculate a discount in 3 steps

Write the percentage off as a decimal (20% = 0.20).
Multiply the original price by that decimal to get the amount off.
Subtract the amount off from the original, or multiply the original by (1 − decimal).

Practical examples

25% off 80

Amount off: 80 × 0.25 = 20. Sale price: 80 − 20 = 60. You pay 75% of 80.

10% off 45.50

Amount off: 4.55. Sale price: 40.95.

A quick mental check for 20% off

10% is one tenth of the price. 20% is twice that. 20% off 50 is 10 off, leaving 40.

When to use this calculator

Sale tags, coupons stated as a percentage, and comparing two markdowns on the same original price.

Common mistakes

Taking 20% off by subtracting 20 from the price, regardless of the original. 20% off 50 is 10, not 20.
Stacking two “percentage off” figures by adding them when they are meant to be applied one after the other.

Frequently asked questions

How do I calculate 20 percent off an item?

Multiply the price by 0.20 to get the saving, then subtract it, or multiply the price by 0.80 to get the sale price directly.

Can a percentage off be greater than 100%?

A figure over 100% would more than wipe out the price and produce a negative result. The calculator will still compute it and warn you, because that is rarely a meaningful sale price.