How do I calculate 20% off a price?

Multiply the price by 0.20 to get the discount, then subtract it. For $45: 45 × 0.20 = $9 off, so you pay $36. Equivalently, multiply the price by 0.80.

Is 20% off plus 10% off the same as 30% off?

No. Stacked discounts apply one after the other: 20% then 10% leaves you paying 80% × 90% = 72% of the original — a 28% total discount, not 30%.

Discount Calculator

Find out what you'll actually pay after a discount. Enter the original price and the discount percentage to get the final price and the amount saved. You can also stack a second discount (say, 20% off plus an extra 10% off) — the tool applies them sequentially, the way stores do, which is less than adding the percentages together.

Calculators

Original price ($)

Discount (%)

Extra discount (%) — optional

Final price: $90.00
You save: $30.00
Effective discount: 25%

Private by default

This tool runs entirely in your browser. Your data is never uploaded to a server.

How to use

4 clear steps.

Enter the original price.
Enter the discount percentage.
Optionally add a second, stacked discount.
Read the final price and total savings.

Good to know

Frequently asked questions

How do I calculate 20% off a price?: Multiply the price by 0.20 to get the discount, then subtract it. For $45: 45 × 0.20 = $9 off, so you pay $36. Equivalently, multiply the price by 0.80.
Is 20% off plus 10% off the same as 30% off?: No. Stacked discounts apply one after the other: 20% then 10% leaves you paying 80% × 90% = 72% of the original — a 28% total discount, not 30%.