How do I calculate a discount by hand?

Multiply the original price by the discount percentage and divide by 100 to get the discount amount, then subtract it from the original price. For $80 at 25% off: 80 × 25 ÷ 100 = $20 off, so you pay $60.

Do 20% off and another 20% off make 40% off?

No. The second discount applies to the already-reduced price, not the original. A $100 item at 20% off becomes $80, and another 20% off $80 is $64 — a combined 36%, not 40%. The calculator shows this effective percentage for you.

How do I find the percent off from two prices?

Subtract the sale price from the original price, divide by the original price, and multiply by 100. The reverse calculator on this page does it instantly — useful for checking whether a '50% off' sign is telling the truth.

Does this include sales tax or VAT?

No. The result is the pre-tax sale price. Tax is normally applied to the discounted price, so calculate the discount first and add tax to the final number.

Is my data sent anywhere?

No. The calculation runs in JavaScript inside your browser. Nothing is uploaded, logged, or stored, and the page keeps working with the network switched off.

Discount Calculator — Sale Price, Savings & Percent Off

Original price

Percent off

Extra coupon

% more

You pay

—

You save

—

Effective discount

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Reverse: what percent off is this?

Enter the old price and the new price to get the real discount.

Was

Now

Percent off

—

Savings

—

Type in the original price and the percentage off to see what you actually pay and how much you save. A second field stacks an extra coupon on top of the sale price — the way most 'extra 20% off already-reduced items' offers really work. The reverse calculator below turns an old price and a new price back into a percentage.

How it works

1
Enter the original price Put the pre-sale price into the first field and pick your currency symbol. Decimals are fine — 129.99 works just as well as 130.
2
Enter the percent off Type the discount percentage or tap one of the presets (10%, 20%, 25%, 30%, 50%, 70%). The sale price and your savings update as you type.
3
Stack a second coupon (optional) If a coupon takes an extra percentage off the already-reduced price, put it in the second field. The tool shows the intermediate price and the true combined discount.

Your data stays private

All processing happens entirely in your browser. No files, text, or data are ever sent to our servers. You can disconnect from the internet and this tool will still work.

Frequently asked questions

How do I calculate a discount by hand?: Multiply the original price by the discount percentage and divide by 100 to get the discount amount, then subtract it from the original price. For $80 at 25% off: 80 × 25 ÷ 100 = $20 off, so you pay $60.
Do 20% off and another 20% off make 40% off?: No. The second discount applies to the already-reduced price, not the original. A $100 item at 20% off becomes $80, and another 20% off $80 is $64 — a combined 36%, not 40%. The calculator shows this effective percentage for you.
How do I find the percent off from two prices?: Subtract the sale price from the original price, divide by the original price, and multiply by 100. The reverse calculator on this page does it instantly — useful for checking whether a '50% off' sign is telling the truth.
Does this include sales tax or VAT?: No. The result is the pre-tax sale price. Tax is normally applied to the discounted price, so calculate the discount first and add tax to the final number.
Is my data sent anywhere?: No. The calculation runs in JavaScript inside your browser. Nothing is uploaded, logged, or stored, and the page keeps working with the network switched off.

From the blog

How to Calculate a Discount (and Why Stacked Coupons Lie) Percent-off maths in plain English, plus the reason two 20% coupons never add up to 40%. Read the post →