Percentage Calculator
Calculate percentages, what-percent-is-X-of-Y, and percentage change/increase/decrease, entirely in your browser.
How to Calculate Percentages for Free
1. Use the first calculator to find X% of a value (e.g. 20% of 150).
2. Use the second to find what percent one number is of another (e.g. 30 is what % of 150).
3. Use the third to find the percentage increase or decrease between two values.
4. All three update instantly as you type — no button to press.
Calculation in Your Browser
Every calculation runs entirely in your browser using plain JavaScript arithmetic. Nothing you type is ever sent to a server.