Discount Calculator (Percent Off)
Enter the original price and the discount to see the sale price and how much you save. Add an extra discount or sales tax if you need to.
Your result appears here.
By Shah Rukh, software developer · Last updated:
How to calculate a discount
Sale price = Original price × (1 − Discount ÷ 100)
Example: $80 with 25% off: 80 × 0.75 = $60, so you save $20.
Stacked discounts aren’t added together
“25% off plus an extra 10%” is not 35% off. The second discount applies to the already-reduced price: 80 × 0.75 × 0.90 = $54, which is 32.5% off in total. The calculator shows the real combined discount.
Quick discount maths
- 50% off: half the price.
- 25% off: take a quarter away.
- 20% off: find 10% (move the decimal) and double it.
- “Buy one, get one 50% off” on two equal items is 25% off overall.
Need other percentages? Try the percentage calculator.
Frequently asked questions
How do I calculate 30% off?
Multiply the price by 0.70. For example, $50 with 30% off costs $35.
Is tax added before or after the discount?
Usually after. Sales tax is charged on the discounted price, which is how this calculator works.
How do I find the original price from the sale price?
Divide the sale price by (1 − discount). A $60 item at 25% off was 60 ÷ 0.75 = $80.
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