- Single discount: sale price = price × (1 − discount%). $80 with 20% off is $80 × 0.80 = $64.
- Stacked discounts apply one after the other — 20% off then an extra 10% is 72% of the original, not 30% off.
- The second section works backwards: enter the old and new price to reveal the percentage you actually saved.
- Combine with our percentage calculator for tax on sale prices.
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Discount Calculator
Find the final sale price after a percentage discount — and stack an extra 'additional % off' like clearance sales do. Savings shown instantly.
Price after discount
You save: $16 | You pay: $64
What was the discount percentage?
Discount: 25% off
How the discount calculator works
Browse all embeddable calculators →
Frequently asked questions
How do I calculate a discount?
Multiply the price by the discount percentage and subtract it, or multiply the price by (1 − percentage as a decimal). 20% off $80: 80 × 0.20 = $16 off, so you pay $64.
Last updated: October 2026.
How much is 20% off?
Take the price × 0.20 to find the saving, or price × 0.80 for what you pay. $50 at 20% off costs $40.
How do double discounts work?
They're applied in sequence, not added. 20% off then extra 10% off a $100 item: $100 → $80 → $72 — a total of 28% off, not 30%.
How do I find the original price from a sale price?
Divide the sale price by (1 − the discount as a decimal). A $75 item at '25% off' was originally $75 ÷ 0.75 = $100.
How does the “discount calculator uk” calculate a sale price?
Enter the original price and discount percentage. The page explains the formula: sale price = price × (1 − discount%). Its example shows £80 with 20% off becoming £64.
Related tools
- Percentage calculator — percentage change and share
- Sales tax calculator — US state and local sales tax
- Profit margin calculator — margin and markup on your prices
Estimates are for guidance only. Sale prices exclude tax unless stated.