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Percentage calculator

Work out X percent of Y, what percentage X is of Y, and the percent change between two numbers, instantly.

Percentage

Pick a mode. Results update live as you type.

Result
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Enter numbers to see the result.

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Formulas: X% of Y = (X / 100) x Y. X as % of Y = (X / Y) x 100. Percent change = ((Y - X) / X) x 100.
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Three calculations in one

X% of Y answers questions like "what is 20% of 150?" X is what % of Y answers "30 is what percent of 150?" Percent change answers "prices went from $80 to $100: how much did they rise?" Pick the mode that matches your question and the math updates as you type.

Percent change, signed

Percent change can be positive or negative: a rise shows with a +, a drop shows as a negative number. It is always measured against the old value, which is why going from 100 to 150 (+50%) and back from 150 to 100 (-33.3%) are not symmetric.

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Percentage Calculator FAQs

How do I calculate X percent of Y?
Divide X by 100 and multiply by Y. For example, 20% of 150 is (20 / 100) x 150 = 30.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 as a percentage of 150 is (30 / 150) x 100 = 20%.
How is percent change calculated?
Subtract the old value from the new value, divide by the old value, and multiply by 100. From 80 to 100 that is ((100 - 80) / 80) x 100 = +25%.
What is the difference between percent and percentage points?
A move from 20% to 25% is a 5 percentage point increase, but a 25% relative increase. Mixing the two up is one of the most common statistics mistakes.
Is my data uploaded anywhere?
No. Every calculation happens in your browser with JavaScript. Nothing you enter leaves your device.
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