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Discount Calculator
Work out the sale price, the amount saved, the discount percentage, or the original price — instantly.
Runs entirely in your browser — nothing you type is uploaded.
How to use the Discount Calculator
- Pick a mode: Sale price, Discount %, Original price or From savings.
- Enter the two values the mode asks for — the field labels change to match.
- Optionally choose a currency symbol so the results read the way you expect.
- Press Calculate (or the Enter key) to see the result, then Copy result or Reset.
What a discount calculator does
A discount calculator takes the guesswork out of sales. Whether you are shopping and want to know the final price after a percent off, checking how big a deal really is, or working backwards from a sale price, this tool does the arithmetic for you in four ways: it finds the sale price, the amount you save, the discount percentage, or the original price.
What discount percentage means
A discount percentage is the share of the original price that is taken off. A 20% discount means you pay 20% less than the original price. To turn a percentage into money, multiply the original price by the percentage and divide by 100 — so 20% of 100 is 20. The bigger the percentage, the more you save.
How the sale price is calculated
The sale price is the original price minus the discount amount. In formulas:
- Sale price
Original − (Original × Discount% ÷ 100) - Amount saved
Original − Sale - Discount %
(Original − Sale) ÷ Original × 100 - Original from sale + %
Sale ÷ (1 − Discount% ÷ 100) - Original from sale + savings
Sale + Savings
For example, a 100 item at 20% off costs 100 − 20 = 80, and you save 20. If you only know the sale price (80) and the discount (20%), the original price is 80 ÷ (1 − 0.20) = 100.
Benefits and use cases
- Shop smarter — see the real final price before you buy.
- Compare deals — turn “25% off” and “save 20” into numbers you can compare.
- Price your products — set a sale price from a target discount, or recover the original price.
- Check the maths — confirm the discount a shop advertised is really what you get.
Is it private?
Yes. The Discount Calculator runs entirely in your web browser using JavaScript. The numbers you enter are never sent to a server, never stored, and never shared. There is no sign-up and no tracking.
Frequently Asked Questions
Is the Discount Calculator free?
Yes. It is completely free to use, with no account, sign-up or limits.
How do I calculate a sale price after a discount?
Multiply the original price by the discount percentage to get the amount off, then subtract it from the original price. For example, 20% off 100 is 20 off, giving a sale price of 80. The “Sale price” mode does this for you.
How do I work out the discount percentage from two prices?
Subtract the sale price from the original price to get the savings, divide that by the original price and multiply by 100. For example, 100 down to 75 is a saving of 25, which is a 25% discount. Use the “Discount %” mode.
Can it find the original price before the discount?
Yes. If you know the sale price and the discount percentage, divide the sale price by (1 − discount ÷ 100). If you know the sale price and the amount saved, add them together. Both are built in as separate modes.
Is my data stored or sent anywhere?
No. All calculations run locally in your browser — the numbers you enter are never uploaded, saved or shared.