🏷️Discount Calculator
Find the sale price, the percent off, or the original price of any discounted item
Last updated: October 20, 2026
How to Use the Discount Calculator
How to calculate a discount
- Choose what you want to find. Pick Sale price if you know the original price and the percent off, Percent off if you know both prices, or Original price if you only know what you paid and the discount.
- Enter the numbers. Type the prices and the discount percentage. Only the fields you need are shown.
- Add an extra discount (optional). If a coupon or checkout offer takes another percentage off, enter it in the extra discount field. The calculator applies it after the first discount.
- Add sales tax (optional). Enter your local rate to see the final amount you will pay at the register.
- Read your result. The answer updates as you type, with the amount you save shown underneath.
Formula & Methodology
Discount formulas
Sale price = Original price × (1 − Discount % ÷ 100)
Amount saved = Original price − Sale price
Discount % = (Original price − Sale price) ÷ Original price × 100
Original price = Sale price ÷ (1 − Discount % ÷ 100)
Worked example
A jacket costs $80 and is 25% off.
- Convert the percentage to a decimal: 25 ÷ 100 = 0.25
- Subtract it from 1: 1 − 0.25 = 0.75
- Multiply: $80 × 0.75 = $60.00
- You save $80 − $60 = $20.00
Stacked discounts
When a second discount is applied after the first, the two percentages are not added together. Each one applies to the price left after the previous one:
Final price = Original × (1 − D1) × (1 − D2)
20% off followed by an extra 10% off leaves 0.80 × 0.90 = 0.72 of the price, which is a 28% total discount, not 30%.
Adding sales tax
Sales tax is normally charged on the discounted price, so Total = Sale price × (1 + Tax % ÷ 100).
About Discount Calculator
Our discount calculator is a free, easy-to-use tool designed to help youfind the sale price, the percent off, or the original price of any discounted item. If you're a professional or just need quick calculations, our calculator provides accurate results instantly.
Frequently Asked Questions
How do you calculate a percent discount?
Multiply the original price by the discount percentage divided by 100 to get the amount saved, then subtract it from the original price. For example, 25% off $80 is $80 × 0.25 = $20 saved, so the sale price is $60. A shortcut is to multiply the original price by (1 − 0.25) = 0.75 to get $60 directly.
How do I find the discount percentage if I know both prices?
Subtract the sale price from the original price, divide the result by the original price, and multiply by 100. If an item dropped from $80 to $60, the discount is (80 − 60) ÷ 80 × 100 = 25%. Choose "Percent off" in the calculator above to do this automatically.
How do I work out the original price from a sale price?
Divide the sale price by (1 − discount as a decimal). If you paid $60 after a 25% discount, the original price was $60 ÷ 0.75 = $80. A common mistake is to add 25% back onto $60, which gives $75 and is wrong because the 25% was taken off the larger original amount.
How do two discounts in a row work (double discount)?
Stacked discounts multiply rather than add. 20% off and then an extra 10% off is 0.80 × 0.90 = 0.72 of the original price, a 28% total discount. The order does not change the final price, but the percentages are never simply added together.
Is sales tax calculated before or after the discount?
In most places sales tax is charged on the discounted price, so a discount also lowers the tax you pay. Some stores, and manufacturer coupons in particular, are treated differently, so the receipt can vary. Enter your local tax rate above to see an estimate of the total.
What is 30% off $50?
30% of $50 is $15, so you save $15 and pay $35. You can also multiply $50 by 0.70 to get $35 in one step.
Is a 50% discount the same as buy one get one free?
For two identical items, yes: paying for one and getting the second free costs the same as getting both at 50% off. The difference is that BOGO deals usually require you to buy two items, while a percent discount applies to each item you buy.
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