Discount Calculator

Free discount calculator: find the final price after a discount and how much you save. Enter the original price and discount percentage.

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This tool has a free JSON API. Copy a prompt or skill below to use it with ChatGPT, Claude, or any AI agent — no API key needed.

API docs
Enter price and discount.

How discount calculator works

This discount calculator works out the final price after applying a percentage discount. It multiplies the original price by the discount percentage divided by 100 to get the savings, then subtracts that from the original price. For example, a 100 item with a 25% discount saves 25, giving a final price of 75.

The calculator handles discount percentages from 0 to 100. A 100% discount means the item is free. Values are rounded to two decimal places (cents). It is useful during sales, for comparing deals, and for verifying that advertised discounts are correct.

All calculation happens in your browser instantly as you type. No data is sent anywhere, so it is safe to use for any price point.

Frequently asked questions

How do I calculate a discount?
Multiply the original price by the discount percentage and divide by 100 to get the savings, then subtract from the original price. For example, 25% off 80 is 80 times 0.25 = 20 saved, final price 60.
How do I calculate the original price from a discounted price?
Divide the discounted price by (1 minus discount/100). For example, if 60 is the price after a 25% discount, the original was 60 / 0.75 = 80.
Can I use this for any discount percentage?
Yes. Any percentage from 0 to 100 works. A 0% discount means no change, and a 100% discount means the item is free.
Does it handle decimal discounts?
Yes. You can enter decimal percentages like 33.3% or 12.5%. The calculator rounds monetary results to two decimal places.