Free Online Discount Calculator
Calculate sale price, savings, and the original price after a discount.
Applied to the discounted price in "find sale price" mode.
In "find original price" mode, enter the final sale price you paid and the advertised discount percentage. Optional tax is removed before working back to the pre-discount price.
About the Discount Calculator
Discounts are usually advertised as a percentage off, but the number that matters at the checkout is the final price and the actual amount saved. This calculator works in both directions. In the forward mode you enter an original price and a discount to see what you will pay. In the reverse mode you enter the sale price and the advertised discount to discover the original price before the markdown.
The formulas
For a percentage discount, the sale price is original × (1 − discount ÷ 100) and the saving is the original price multiplied by the discount rate. For a fixed-amount discount, the sale price is simply the original price minus the discount amount. Optional tax is applied after the discount, because tax is normally charged on the reduced price. In reverse mode the process is inverted: first remove tax by dividing the sale price by (1 + tax ÷ 100), then divide by (1 − discount ÷ 100) to recover the original price.
Watch out for stacked discounts. A 20% discount followed by another 20% is not a 40% discount. Each percentage applies to the already-reduced price, so the effective total is 36% off. The effective discount figure shown by this tool reflects the real reduction relative to the original price, which is the number worth comparing across stores.
Frequently asked questions
Why is my calculated original price higher than expected?
Because the sale price you entered may already include tax, and the discount may have been applied on top of a further markdown. The reverse calculation removes tax first, then reverses the discount.
Can the discount be 100%?
A 100% percentage discount would make the item free and cannot be reversed from a zero sale price. Use a value below 100%, or switch to the fixed-amount mode.
Does the calculator include shipping?
No. Shipping, handling, and other checkout fees are separate. Add them after the final price if you want a true landed cost.