How to Calculate a Discount and Sale Price (Free Guide)
Updated 2026-06-01
Spotting a "30% off" sticker is easy; knowing the exact price you will pay is the useful part. Here is the simple way, plus a free Discount Calculator.
The discount formula
Sale price = original price × (1 − discount% ÷ 100)
Example: a $80 item at 25% off → 80 × (1 − 0.25) = 80 × 0.75 = $60. You save $20.
How much did I save?
Savings = original price × (discount% ÷ 100) — in the example, 80 × 0.25 = $20.
Stacking two discounts
Discounts stack multiplicatively, not by adding. 20% then 10% off is not 30% off: 100 → 80 → 72, an effective 28% off. Apply one in the Discount Calculator, then reuse the result for the next.
Don't forget tax
If tax applies after the discount, run the sale price through the VAT Calculator.
Frequently asked questions
Is the discount applied before or after tax? Usually before tax — discount first, then tax on the reduced price.
Is my data uploaded? No. The calculation happens in your browser.