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Discount Calculator

What you really pay, and what you really save.

For “an extra 10% off sale prices”.

Price after discount = price × (1 − discount ÷ 100). A second discount applies to the already-reduced price, so 20% then 10% off is 28% off in total, not 30%.

Everything is processed on your device. Nothing you upload or type is sent to a server, and nothing is stored.

Discount Calculator online

“20% off, plus an extra 10% at the till” sounds like 30% — it is actually 28%. Enter the original price and the discounts to see the price you pay, how much you save, and the true total discount.

How to use discount calculator

  1. Enter the original price

    The price before any discount.

  2. Enter the discount

    The percentage off, plus an optional extra discount applied after it.

  3. Read the result

    The price you pay, your saving and the total discount, as you type.

Frequently asked questions

How do I calculate a discount?

Multiply the price by 1 minus the discount as a decimal. 25% off ₦8,000 is ₦8,000 × 0.75 = ₦6,000.

Why isn't 20% plus 10% off the same as 30%?

The second discount applies to the already-reduced price. 20% then 10% leaves 0.8 × 0.9 = 72% of the price — 28% off.

Can I work out the original price from a sale price?

Divide the sale price by 1 minus the discount. ₦6,000 after 25% off was ₦6,000 ÷ 0.75 = ₦8,000.

Add Discount Calculator to your website

Free to embed on any site or blog. Your visitors use it right on your page, and their files never leave their device.

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