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Percentage Calculator

Find percents of amounts, reverse percents, and percent change in one free tool.

What is X% of Y?

Find a percentage of a number.

Result

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Enter the percent and base amount.

X is what percent of Y?

Find what percent one number is of another.

Result

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Enter a part and a non-zero whole.

Percent change from X to Y

Find the percent increase or decrease.

Result

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Enter a non-zero starting value and an ending value.

Help & support

Frequently Asked Questions

Quick answers to common questions about the Percentage calculator.

What is 20% of 150?

Convert 20% to 0.2 and multiply by 150. The result is 30.

How do I calculate percentage increase?

Subtract the original from the new value, divide by the original, then multiply by 100.

What is the difference between percent and percentage points?

Percentage points are the direct difference between two percentages. Percent change compares that difference with the original percentage.

Can a percentage change be negative?

Yes. A negative change indicates the new value is below the original value.

Why is percentage change from zero undefined?

The formula divides by the original value, and division by zero has no finite result.