Discount Calculator
Find the final price after a discount and how much you save.
%
90
Final priceFinal price
75%
You save
25%
- 1
Amount saved
120 × 25 ÷ 100 = 30 - 2
Final price
120 − 30 = 90
Formula
How this is calculated
This tool works out a simple percentage markdown. The two inputs are the original price (the listed price before any reduction, in whatever currency you are using) and the discount, expressed as a percentage of that original price. The calculator never mixes currencies or converts units — both amounts stay in the same money unit you type in.
It first divides the discount percentage by 100 to turn it into a decimal fraction, then multiplies the original price by that fraction to get the amount you save. The final price is simply the original price minus that saving, which is the same as multiplying the price by (1 − discount ÷ 100). For example, 25% off a price of 120 saves 30, leaving a final price of 90.
The result is rounded to two decimal places for display, so very long fractions are trimmed. It assumes a single flat discount applied to the pre-tax price and does not account for sales tax, VAT, stacked or coupon discounts, shipping, or minimum-spend rules. Entering a discount above 100% produces a negative final price, which is not realistic for a sale.
Examples
| Input | Result |
|---|---|
| $120 original, 25% off | Save $30, pay $90 |
| $49.99 original, 30% off | Save $15.00, pay $34.99 |
| $80 original, 20% then extra 10% off | 80 x 0.80 x 0.90 = $57.60 (28% off) |
| Sale price $90 after 25% off | Original = 90 / 0.75 = $120 |
About this calculator
A discount is a reduction from an item's original price, usually advertised as a percentage off such as "25% off." The discount calculator turns that marketing percentage into real numbers by telling you exactly how much you save and what the final sale price will be, so you can judge whether a deal is genuinely worth it. It works for single discounts as well as for comparing the value of competing offers.
The math has two parts. The amount you save equals the original price multiplied by the discount percentage as a decimal, so 25% off a $120 item saves 120 x 0.25 = $30. The sale price is the original price minus that saving, which is 120 - 30 = $90; equivalently you can multiply the original price by (1 minus the discount), so 120 x 0.75 = $90. Both routes give the same answer, and the second is faster when you only need the final price.
To use the calculator, enter the original price and the discount percentage. The tool immediately displays the dollar amount saved and the price you will actually pay. If you want to test a different sale, just change the percentage and watch both figures update, which makes it easy to compare a flat percentage deal against a fixed-dollar coupon.
Interpreting the output is direct. The savings figure is money that stays in your pocket, and the sale price is what rings up at the register before any sales tax. Remember that tax is generally applied to the discounted price, not the original, so a bigger discount also slightly reduces the tax you pay.
The most common trap is stacking discounts incorrectly. Two successive discounts do not simply add: 20% off followed by an extra 10% off is not 30% off, because the second cut applies to the already-reduced price, giving a combined 28% off. Another mistake is comparing a percentage discount with a dollar coupon without checking the original price, since 30% off only beats a flat $20 off when the item costs more than about $67.
Frequently asked questions
Multiply the original price by one minus the discount as a decimal. For 25% off a $120 item, compute 120 x (1 - 0.25) = 120 x 0.75 = $90. You can also subtract the savings of $30 from $120 to get the same result.
No. A second discount applies to the already-reduced price, not the original. Taking 20% off and then 10% off leaves you paying 80% x 90% = 72% of the original, which is a combined 28% discount rather than 30%.
Sales tax is normally calculated on the discounted price, so a larger discount also lowers the tax. If a $90 sale price carries 8% tax, you pay 90 x 1.08 = $97.20, not tax on the original $120.
Compare the two at your item's price. A 30% discount equals a $20 coupon only when the item costs about $66.67; above that price the percentage saves more, and below it the flat coupon wins. Always check against the original price.
Divide the sale price by one minus the discount. If an item is $90 after 25% off, the original was 90 / 0.75 = $120. Dividing rather than adding the percentage back avoids a common reverse-calculation error.
It is the fraction of the original price you do not pay. A 30% discount means you keep 30% of the price and pay the remaining 70%. On a $49.99 item that is a $15.00 saving and a $34.99 final price.
Also known as
TG we-Calculate Editorial Team. (2026). Discount Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/discount-calculator
TG we-Calculate Editorial Team. "Discount Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/discount-calculator.
TG we-Calculate Editorial Team, "Discount Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/discount-calculator
@misc{wecalculate_discount_calculator, title = {Discount Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/discount-calculator}}, year = {2026}, note = {TG we-Calculate} }
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