price − % − % + tax
Discount calculator
An item priced at 100 costs 80 after a 20% discount, so you save 20. Enter the price and the discount; add a second discount or a tax rate if the price has them.
- 100 − 20% = 80
- 100 − 20% − 10% = 72 (−28%)
The result updates as you type. Amounts are rounded to the cent only for display, so the percentages are worked out from the unrounded figures. The currency is up to you: the calculator only uses numbers.
Scanned by 
NortonTM Safe Web
At a glance
- Price
- No charge
- Account
- None needed
- Upload
- Not applicable — you type numbers, nothing is sent anywhere
- Formula
- price × (1 − first ÷ 100) × (1 − second ÷ 100) × (1 + tax ÷ 100)
- Rounding
- To the cent, for display only
- Limits
- Discounts from 0 to 100%; tax is added last; any currency
Sale prices at common discounts
Each cell is the original price minus the discount, from the same function as the calculator, before any tax.
| Original price | 10% off | 15% off | 20% off | 25% off | 30% off | 50% off |
|---|---|---|---|---|---|---|
| 10 | 9 | 8.5 | 8 | 7.5 | 7 | 5 |
| 25 | 22.5 | 21.25 | 20 | 18.75 | 17.5 | 12.5 |
| 50 | 45 | 42.5 | 40 | 37.5 | 35 | 25 |
| 100 | 90 | 85 | 80 | 75 | 70 | 50 |
| 250 | 225 | 212.5 | 200 | 187.5 | 175 | 125 |
How to calculate a discount
Enter the original price and the discount
Type the price before the sale and the discount in percent. The sale price and the amount saved appear at once.
Add a second discount or tax if they apply
A second discount, such as an extra 10% at the till, is taken off the already reduced price. A sales tax or VAT rate is added last, on the price after both discounts.
Read the totals
You see the sale price, the amount saved, the total discount as a share of the original price, and the final price including tax.
How the sale price is worked out
A discount of d% multiplies the price by (1 − d ÷ 100). A 20% discount on 100 gives 100 × 0.8 = 80. A second discount applies to the reduced price, not to the original, so the two percentages do not add up: 20% and then 10% gives 100 × 0.8 × 0.9 = 72, which is 28% off, not 30%.
Sales tax is added after the discounts and multiplies the price by (1 + tax ÷ 100): 80 with 20% and 10% off and 8% tax comes to 62.21, because 57.60 × 1.08 = 62.208. Some shops apply tax before a discount or round each line separately, so a receipt can differ from this result by a cent. A discount of 100% gives a price of zero, and a discount above 100% is refused.
Discount questions
How do I calculate a percentage discount?
Multiply the price by the discount divided by 100 to get the amount saved, then subtract it. 25% off 80 saves 0.25 × 80 = 20 and leaves 60. In one step, multiply the price by 0.75.
Do two discounts add up?
No. The second discount applies to the reduced price. 20% off followed by 10% off is 28% off, because 0.8 × 0.9 = 0.72. Two successive discounts of 50% are 75% off, not 100%.
Is tax added before or after the discount?
This calculator adds tax last, on the price after the discounts. If your shop taxes the full price first, the final figure will differ.
How do I find the original price from a sale price?
Divide the sale price by 1 minus the discount. If an item costs 60 after 25% off, the original was 60 ÷ 0.75 = 80. You can check it by entering 80 and 25 here.
Why does my receipt differ by a cent?
This page rounds to the cent only when it shows a figure. A shop may round each line or each tax step to the cent, and the rounding can add up to a cent of difference on the total.
Does the calculator store or send my prices?
No. It does arithmetic in your browser tab and sends nothing anywhere. It also works offline once the page has loaded.