Discount Calculator
Work out a sale price from a percent off, the percent off from two prices, or the original price
Updated 2026-11-10
- Sale price
- $60.00
- You save
- $20.00
- Total discount
- 25.0%
Sale price = original × (1 − discount). Sales tax is charged on the discounted price.
Your numbers stay on this device. The page link keeps your inputs, so a bookmark or shared link reopens these results.
| Discount | You pay | You save |
|---|---|---|
| 5% off | $76.00 | $4.00 |
| 10% off | $72.00 | $8.00 |
| 15% off | $68.00 | $12.00 |
| 20% off | $64.00 | $16.00 |
| 25% off | $60.00 | $20.00 |
| 30% off | $56.00 | $24.00 |
| 40% off | $48.00 | $32.00 |
| 50% off | $40.00 | $40.00 |
| 60% off | $32.00 | $48.00 |
| 70% off | $24.00 | $56.00 |
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A discount takes a percentage off the original price: 25% off $80 is $80 × 0.75 = $60, and you save $20. Pick what you want to find. Sale price uses the original price and the percent off; percent off compares the original and sale prices; original price works backwards from a sale price. Add a second discount to see what stacked deals really give you, and a tax rate to see the price at the register. Nothing is stored or sent.
The discount formula
Sale price = original price × (1 − discount ÷ 100). The amount saved is the original price × discount ÷ 100. So 30% off a $45 item saves $13.50 and the sale price is $31.50.
Percent off = (original − sale) ÷ original × 100. A $45 item marked down to $36 is $9 off, and $9 ÷ $45 = 20% off.
Original price = sale price ÷ (1 − discount ÷ 100). If something costs $63 after 30% off, it was $63 ÷ 0.70 = $90 before the sale. Adding 30% back to $63 gives $81.90, which is wrong: the 30% was taken off the bigger number.
Stacked discounts do not add up
When a second discount applies on top of the first ("an extra 10% off sale prices"), it comes off the already-reduced price. 20% off and then 10% off a $50 item is $50 × 0.80 × 0.90 = $36, which is 28% off in total, not 30%.
The order does not matter: 10% then 20% gives the same $36. What matters is whether the store adds the percentages (rare) or applies them one after the other (usual).
| First | Then | Total off |
|---|---|---|
| 10% | 10% | 19% |
| 20% | 10% | 28% |
| 25% | 10% | 32.5% |
| 30% | 20% | 44% |
| 40% | 25% | 55% |
| 50% | 20% | 60% |
| 50% | 50% | 75% |
Discounts and sales tax
Sales tax is charged on what you actually pay, so it is worked out after the discount. A $60 sale price at 8.25% tax is $60 + $4.95 = $64.95 at the register. A store coupon reduces the taxable price; in many states a manufacturer coupon does not, because the store is paid the coupon value by the manufacturer.
Running a sale as a business
For the seller, a discount comes straight out of gross profit, so it costs far more than its headline percentage. An item with a 40% margin that goes 20% off keeps only a 25% margin, and you need to sell 60% more units to make the same profit.
Before you set a sale price, check the volume you need with the discount break-even calculator, and the margin left at the new price with the profit margin calculator.
Frequently asked questions
How do I calculate a discount?
Multiply the price by the discount as a decimal to get the saving, then subtract it. 25% off $80: 80 × 0.25 = $20 saved, so you pay $60.
How do I calculate the percent off?
Subtract the sale price from the original price, divide by the original price and multiply by 100. $45 down to $36 is 9 ÷ 45 = 20% off.
What is 20% off $50?
$40. You save $10, because 20% of $50 is $10.
Is 20% off and then 10% off the same as 30% off?
No. The second discount comes off the reduced price, so 20% then 10% is 28% off: $50 becomes $40 and then $36.
How do I find the original price before a discount?
Divide the sale price by 1 minus the discount. A $63 price after 30% off was 63 ÷ 0.7 = $90.
Is sales tax calculated before or after a discount?
After a store discount: you pay tax on the reduced price. A $60 sale price at 8.25% tax costs $64.95.
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Start freeAs an Amazon Associate, ExpressBizTools earns from qualifying purchases. Product links are affiliate links. Calculations are for general planning and are not tax, legal, or financial advice.