Discount Calculator: Sale Price and Percent Off
Find the sale price after a discount, work out the percent off from two prices, or get the original price back from a sale price. You can also stack a second discount and add tax. Select your country to set the currency. It runs in your browser, so nothing you enter is stored.
Estimates only. The store checkout total, tax and any limits on coupons decide the final price.
Your prices
Your results
How to calculate a discount
- Choose what you want: the sale price, the percent off, the original price, or a multi-buy deal such as 3 for 2.
- Pick your country so the currency symbol is right.
- Enter the numbers. For a sale price, give the original price and the discount, as a percent or a fixed amount (a coupon). Add a second discount if the store stacks one.
- Read the result and the steps. Use Load example to see a worked case.
Discount formulas
- Sale price = original price × (1 − discount ÷ 100). For $80 with 25% off: 80 × 0.75 = $60.
- You save = original price × discount ÷ 100. Here that is $20.
- Percent off = (original − sale) ÷ original × 100. For $80 and $60: 20 ÷ 80 = 25%.
- Original price = sale price ÷ (1 − discount ÷ 100). For $60 at 25% off: 60 ÷ 0.75 = $80.
Common discounts on a $100 item
| Discount | You pay | You save |
|---|---|---|
| 10% off | $90 | $10 |
| 15% off | $85 | $15 |
| 20% off | $80 | $20 |
| 25% off | $75 | $25 |
| 30% off | $70 | $30 |
| 40% off | $60 | $40 |
| 50% off | $50 | $50 |
| 60% off | $40 | $60 |
| 70% off | $30 | $70 |
For any other price, move the decimal: 10% off is the price ÷ 10, and 50% off is half.
What happens with two discounts?
Two discounts do not add together. The second one comes off the already reduced price. For example, 20% off and then an extra 10% off is not 30% off. It is $100 × 0.80 × 0.90 = $72, a total discount of 28%.
Use the extra discount box to check a stacked offer before you buy.
Tax, VAT and GST after a discount
Whether tax is added depends on where you shop. In the United States and Canada, tax is usually added at checkout, so enter the tax rate and the calculator adds it after the discount. In the UK, Ireland, Australia, India and most of Europe, shelf prices usually already include VAT or GST, so leave the tax box at 0.
The discount is taken off the price first, and tax is then worked out on the lower price.
Coupons, fixed amounts and multi-buy deals
Fixed amount off. Choose Fixed amount off and type the coupon value. The calculator shows the matching percent. A $20 coupon on an $80 item is 25% off.
Multi-buy deals. Offers like 2 for 1 or 3 for 2 lower the price of each item. Take 3 items, pay for 2, and you save one third (33.3%). Pick Multi-buy mode, enter the price of one item, the items you take and the items you pay for.
| Deal | Items you take | Items you pay for | Effective discount |
|---|---|---|---|
| Buy 1 get 1 free | 2 | 1 | 50% |
| 3 for 2 | 3 | 2 | 33.3% |
| 4 for 3 | 4 | 3 | 25% |
| 5 for 4 | 5 | 4 | 20% |
Frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percent and divide by 100 to get the amount saved. Subtract it from the original price to get the sale price. Or multiply the original price by (1 − discount ÷ 100).
How do I calculate 25% off?
Multiply the price by 0.75. For $80, that is $60. You save $20.
How do I find the percent off from two prices?
Subtract the sale price from the original price, divide by the original price and multiply by 100. For $80 reduced to $60, that is 20 ÷ 80 × 100 = 25%.
How do I find the original price from the sale price?
Divide the sale price by (1 − discount ÷ 100). For a $60 sale price at 25% off, 60 ÷ 0.75 = $80.
Do two discounts add up?
No. The second discount applies to the reduced price, so 20% then 10% is 28% in total, not 30%.
Is tax added before or after the discount?
Usually after. The discount lowers the price and tax is worked out on the lower amount. Some places show prices with tax already included.
What is the difference between a discount and a markdown?
They mean the same thing in practice: a reduction from the original price. Retailers often say markdown for permanent price cuts and discount for offers and coupons.
What is the difference between a percent off and a fixed amount off discount?
A percent off discount takes a share of the price, so it saves more on expensive items. A fixed amount off discount, like a $20 coupon, takes the same amount from any price. To compare them, turn the fixed amount into a percent: amount saved ÷ original price × 100.
How do I spot a fake discount?
Check what the original price really was. Some stores raise the “before” price just before a sale so the cut looks bigger. Compare the sale price with other shops and with the price history if you can. The sale price you pay is the only number that matters.
How do I calculate a discount in Excel or Google Sheets?
If the price is in A1 and the percent off is in B1, the sale price is =A1*(1-B1/100). The amount saved is =A1*B1/100. To find the percent off from two prices, use =(A1-C1)/A1*100 where C1 is the sale price.
What does 3 for 2 or buy one get one free really save?
Buy 1 get 1 free is the same as 50% off when you take two items. 3 for 2 is about 33.3% off, and 4 for 3 is 25% off. Use the Multi-buy mode above to see the exact amount for your price.
Is my information saved?
No. Everything is calculated in your browser and nothing you enter is sent or stored.
About this calculator
Written by Umar Khan. The calculator uses standard percentage formulas: sale price = original × (1 − discount ÷ 100). Results are estimates and your checkout total decides what you pay. Last updated November 12, 2026. Questions or corrections: [email protected].
Written by Umar Khan
Umar Khan is a PhD student in engineering at NTNU, the Norwegian University of Science and Technology, in Norway. Every formula and worked example on this page is shown in full so you can check each result yourself. Corrections are welcome at [email protected].
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For information only, not professional advice.
Written by Umar Khan. Last updated: November 12, 2026.