Percentage Calculator
Calculate what X% of a number is, what percent one number is of another, or the percent change between two numbers.
Everything is calculated entirely in your browser. Nothing is sent to a server.
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How to use this tool
- 1Choose a calculation: what is A% of B, A is what percent of B, or percent change from A to B.
- 2Enter the two values.
- 3The result updates automatically.
Features
- Three common percentage calculations in one tool.
- Instant results as you type.
- No account or sign-up required.
Privacy
Your numbers are calculated entirely in your browser. Nothing is sent to a server.
Frequently asked questions
Is this percentage calculator free?
Yes, and there is no limit on how many times you can use it.
How is percent change calculated?
As ((B − A) / |A|) × 100. A positive result is an increase, a negative result is a decrease.
What happens if I divide by zero?
If the total or starting value is 0, the result is undefined and shown as a dash rather than an error.
Is my data sent to a server?
No. All calculations happen locally in your browser.
Guides
- How to Calculate a Percentage (3 Common Ways, Explained)
What is X% of Y, what percent is X of Y, and what's the percent change between two numbers? Here are the 3 most common percentage calculations, explained.
- How to Find the Original Price Before a Discount
A jacket is $63 after 30% off — what was the original price? Learn the reverse percentage formula, why subtracting 30% back is wrong, and check it free.
- New Year Savings Goal: How Much to Save Each Month
Turn a New Year savings resolution into a monthly number. The formula, worked examples with interest, and a free compound interest calculator.
- Holiday Baking Conversions: Cups to ML, °F to °C and More
Baking a recipe from another country this holiday season? Convert cups, sticks of butter, ounces and oven temperatures correctly — with a handy chart.