How it works
Successive discounts apply to the remaining price. A 20% discount followed by 10% leaves 72% of the original price, so the combined discount is 28%, not 30%.
Savings = original price × discount % ÷ 100; sale price = original price − savings. Original price = sale price ÷ (1 − discount % ÷ 100).
- Choose the prices or discounts you know.
- Enter per-unit prices in any currency.
- For stacked discounts, choose up to three rates.
- Optionally enter quantity and tax.
- Read the final price, savings and working.
Worked example: 80 at 25% off saves 20.00 and gives a final price of 60.00. With 10% tax added, the payable price is 66.00.
Discount examples
| Method | Original price | Final price | You save | Discount |
|---|---|---|---|---|
| Price and % off | 80.00 | 60.00 | 20.00 (25%) | 25% |
| Price and % off | 49.99 | 42.49 | 7.50 (15%) | 15% |
| Stacked discounts | 100.00 | 72.00 | 28.00 (28%) | 20% then 10% |
| Sale price and % off | 80.00 | 60.00 | 20.00 (25%) | 25% |
| Original and sale price | 50.00 | 35.00 | 15.00 (30%) | From the two prices |
Swipe the table sideways to see the rest.
Examples use quantity 1 and no tax. Amounts are in your currency.
Things to consider
- Compare final prices, not just discount rates.
- Check whether tax is already included.
- Enter quantity for matching units.
- Successive discounts do not add.
Frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percentage and divide by 100. Subtract that saving from the original price. For 80 at 25%, you save 20 and pay 60. The Percentage Calculator handles other percentage questions.
How do I find the original price from a sale price?
Divide the sale price by 1 minus the discount rate as a decimal. A sale price of 60 at 25% off gives 60 ÷ 0.75 = 80. A 100% discount cannot reveal the original price.
Why do stacked discounts not add up?
Each discount applies to the price left after the previous one. Starting at 100, 20% off leaves 80. Another 10% saves 8 and leaves 72, so you save 28%, not 30%. The combined rate uses the successive factors; actual savings can differ slightly after cent rounding.
What is the difference between percent off and amount off?
Percent off scales with the original price. Amount off is a fixed saving per unit. To convert an amount to a percentage, divide the saving by the original price and multiply by 100. For 20 off 80, that is 25%. The Percentage Increase and Change Calculator measures rises and falls; the Percentage Difference Calculator compares two values without choosing an original.
Is tax applied before or after a discount?
Tax usually applies to the discounted price, but rules vary. This calculator adds the optional rate after discounts. If prices already include tax, it extracts tax by dividing the discounted price by 1 plus the tax rate, without adding tax twice. Check the rules that apply to your purchase.
How are prices rounded and quantities calculated?
Prices round to two decimal places, half up. Each successive saving rounds to cents before subtraction. At 49.99 with 15% off, savings round to 7.50 and the final price is 42.49. Quantity multiplies the rounded per-unit price and per-unit tax. A seller may round tax on the whole order instead, giving a small difference.
Is a discount the same as profit margin?
No. A discount compares the saving with the original selling price. Profit margin compares profit with revenue, and markup compares profit with cost. Use the Margin Calculator: Profit Margin and Markup for margin and markup.
Results are estimates for general information only, not financial, medical or professional advice.