Free tool
Percentage calculator
Three common percentage questions answered at once from two numbers.
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How it works
How it works
X% of Y = X / 100 x Y. X is what percent of Y = X / Y x 100. Percent change from X to Y = (Y - X) / X x 100.
FAQ
About this calculator
How do I take a percent of a number?
Divide the percent by 100 and multiply. 20% of 150 is 0.20 x 150 = 30.
How do I find percent change?
Subtract the old value from the new value, divide by the old value and multiply by 100.
Why can percent change be over 100%?
If the new value is more than double the old one, the increase is over 100%.
Is anything saved?
No. The math runs in your browser and nothing you enter is sent to us.
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