Percent Off Calculator
Enter a price and a percent off to see the sale price and exactly what you save. You can also stack a second discount, add sales tax for the checkout total, or work backwards to find the real % off between two prices or the original price before a sale.
How to calculate percent off
Multiply the original price by the percent off to find your saving, then subtract it. The shortcut formula is:
Sale price = Original × (1 − Percent off ÷ 100)
So 20% off $80 is $80 × 0.20 = $16 saved, leaving a $64 sale price. The same identity works backwards: divide a sale price by (1 − %/100) to recover the original.
Percent off chart (on a $100 item)
What common discounts come to on a $100 price. The savings scale proportionally, so for your own price just use the calculator above.
| Percent off | You save | Sale price |
|---|---|---|
| 5% off | $5.00 | $95.00 |
| 10% off | $10.00 | $90.00 |
| 15% off | $15.00 | $85.00 |
| 20% off | $20.00 | $80.00 |
| 25% off | $25.00 | $75.00 |
| 30% off | $30.00 | $70.00 |
| 40% off | $40.00 | $60.00 |
| 50% off | $50.00 | $50.00 |
| 60% off | $60.00 | $40.00 |
| 70% off | $70.00 | $30.00 |
| 75% off | $75.00 | $25.00 |
| 80% off | $80.00 | $20.00 |
| 90% off | $90.00 | $10.00 |
Do discounts stack? Why 20% + 10% ≠ 30%
The most common discount mistake is adding percentages. A second discount applies to the already-reduced price, not the original, so it always comes off less money than the first.
- $100, 20% off → $80
- then an extra 10% off the $80 → $72
- total saved is $28, a real 28% off, not 30%
Use add another discount in the calculator to stack as many as you like and see the true effective rate.
Discounts and sales tax
Stores discount first, then charge sales tax on the lower price, so the tax is calculated on what you actually pay rather than the original ticket price. Check add sales tax and the calculator applies your rate after every discount, then shows an itemized total down to the final amount due.
Working backwards from the sale price
- How much of a discount is this, really? Use % off from prices: enter the original and current price to get the true percent off and whether it's a genuine deal.
- What was it before the sale? Use Find original price: enter the sale price and the percent off to recover the pre-discount price.
How to use this calculator
- Enter the original price and a percent off (or tap a quick chip).
- Read the sale price and your saving in the readout.
- Optionally stack another discount or add sales tax for the real total.
- Switch modes to find the percent off from two prices, or the original price from a sale price.
Frequently Asked Questions
How do you calculate percent off?
Do two discounts add together? (20% off then 10% off)
Are discounts applied before or after sales tax?
How do I find the original price from a sale price?
How do I find the percent off from two prices?
What does a negative percent off mean?
Is my data sent anywhere?
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