Percentage Calculator
Percent of, is-what-percent, and % change.
15% of 200 is
30
Runs entirely in your browser — nothing you enter is uploaded or sent to a server.
Simple percentage maths — just make sure you've picked the right question (percent-of, is-what-percent, or change), since each one answers something different. Read our full disclaimer.
About this tool
Percentages come up constantly — discounts, tips, grades, growth. This tool handles the three common questions in one place: a percentage of a number, what percentage one number is of another, and the percentage change from one value to another.
Try it
15% of 200 is 30. 30 is 15% of 200. Going from 200 to 250 is a 25% increase.
How to use
- 1Pick the type of question.
- 2Enter the two numbers.
- 3Read the answer instantly.
Features
- Three questions in one: percent-of, is-what-percent, and % change.
- Handles both increases and decreases (signed % change).
- Answers update the moment you type the two numbers.
Frequently asked questions
How do I calculate percentage change?
Percentage change = (new − old) / |old| × 100. From 200 to 250 that's (250 − 200) / 200 × 100 = 25%.
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