Discount Calculator
Work out the sale price and amount saved after a percentage discount.
How to Use
- Choose which calculation you need from the options above the form.
- Enter the price and the discount percentage — no need to type a % or $ sign.
- The result updates instantly as you type.
- Use Copy Result to copy the answer to your clipboard.
Formula
- Sale price
- sale_price = price × (1 − discount% ÷ 100)
- Amount saved
- amount_saved = price × (discount% ÷ 100)
- Original price (reverse)
- original_price = sale_price ÷ (1 − discount% ÷ 100)
Worked Example
An $80 item with a 25% discount.
- Convert 25% to a decimal: 25 ÷ 100 = 0.25
- Subtract from 1 to get the remaining fraction of the price: 1 − 0.25 = 0.75
- Multiply by the original price: $80 × 0.75 = $60
Result: $60
About This Tool
What this tool does
This calculator works out the sale price and the amount saved when a percentage discount is applied to an original price, and can also work backwards from a sale price to recover the original price.
When to use it
Use it while shopping to check a sale price is correct, to compare discounts across items, or to figure out an item's original price from a "% off" sale tag.
What the result means
Sale price and amount saved are always in the same currency as the price you entered — the calculator has no notion of currency, it just does the arithmetic. The original-price (reverse) result answers "what was this before the discount?".
Assumptions & limitations
Prices must be zero or greater — a negative price is rejected. Discount percentages must be between 0% and 100% inclusive — a discount over 100% (paying you to take the item) or below 0% (a markup) isn't supported by this tool. Recovering the original price from a 100% discount is undefined (a free item could have started at any price), so that case is reported as an error rather than a guess.