Percentage Calculator
Calculate percentages, increases, and decreases.
About Percentage Calculator
Solve any percentage problem online for free with this three-in-one percentage calculator. Work out what X% of a number is, find what percent one number is of another, or calculate the percentage increase or decrease between two values - all on one screen with instant results as you type. It's handy for figuring out discounts and tips, tax, grades, tip splitting, statistics, and business metrics like growth rates. There's nothing to install and nothing is uploaded; the math runs in your browser, so you get a private, ad-light answer the moment you enter your numbers.
How to use this tool
- 1Pick the type of percentage question you need.
- 2Fill in the two known numbers.
- 3The answer appears instantly as you type.
Frequently asked questions
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 25 of 200 is 25 / 200 * 100 = 12.5%.
How is percentage change calculated?
Percentage change is (new - old) / old * 100. A positive result is an increase, a negative one is a decrease.
Related guide
6 min readPercentage Math Without Tears: Discounts, Increases, and Reverse Percentages
The three types of percentage problems, how to reverse a percentage (the one everyone gets wrong), and the mental math shortcuts that make it instant.