Discount Calculator

To calculate a discount percentage, subtract the sale price from the original price, then divide the result by the original price and multiply by 100. For example, if an item costs $80 on sale from $100, the discount is (100 - 80) / 100 × 100 = 20%. Our calculator automates this instantly so you don't need to do the math manually.

To find the final price after a discount, multiply the original price by the discount percentage to get the discount amount, then subtract that from the original price. For instance, a 30% discount on a $50 item saves you $15, making the final price $35. You can also use our calculator by entering the original price and discount percentage to get the result in one click.

To reverse-calculate the original price, divide the sale price by (1 minus the discount rate expressed as a decimal). For example, if an item is $70 after a 30% discount, the original price is $70 / (1 - 0.30) = $100. This reverse discount approach is useful when you see a sale price and want to know what you started with.

Yes. First apply the percentage discount to the original pre-tax price to get the discounted price, then add the applicable sales tax on top of that discounted amount. For example, a $100 item at 20% off becomes $80, and with 8% tax the final cost is $86.40. Our discount calculator with tax support lets you add a tax rate so the true out-of-pocket cost is shown.

A stacked discount means applying two or more discounts sequentially rather than adding them together. For example, a 20% discount followed by an additional 10% off does not equal 30% off — it equals 28% off the original price. Each successive discount is applied to the already-reduced price, so the combined savings are slightly less than the sum of the individual percentages.

The amount saved equals the original price multiplied by the discount percentage divided by 100. Written as a formula: Savings = Original Price × (Discount % / 100). For a $200 item at 15% off, you save $200 × 0.15 = $30, giving a final price of $170. This is the core calculation behind every discount calculator.

When the discount is a fixed dollar amount rather than a percentage, simply subtract the discount dollar value from the original price to find the final price. To also find the equivalent discount percentage, divide the dollar discount by the original price and multiply by 100. For instance, a $25 coupon on a $125 item is a 20% discount and brings the final price to $100.