Free Percentage Calculator
X% of Y, what percent X is of Y, and percentage increase or decrease, all in one place.
What this does: three common percentage calculations in one tool: find X% of a number, find what percent one number is of another, and find the percentage increase or decrease between two values. Everything runs instantly in your browser; it is 100% free with no signup.
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Frequently asked questions
Is this percentage calculator free to use?
Yes, completely free with no signup and no paywall. All three calculations run instantly in your browser using plain JavaScript, with nothing sent to a server.
What is the difference between the three tabs?
'X% of Y' finds a portion of a number, such as 20% of 150. 'What % is X of Y' finds what percentage one number represents of another, such as how much percent 30 is of 150. '% Change' finds the percentage increase or decrease between two values, such as from 80 to 100.
Why do I see an error on the % Change tab?
Percentage change is calculated relative to the 'From value', so that number cannot be zero, dividing by zero is undefined. Enter a non-zero starting value to see the result.