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Calculators

Percentage Calculator

Calculate X% of Y, what percent one value is of another, or the percent change between two values.

Three separate calculations live under one tool — "X% of Y", "what percent is X of Y", and "percent change from X to Y" — pick the mode that matches the question you're actually asking.

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Frequently Asked Questions

"% of" finds a percentage of a number (e.g. 20% of 150). "What percent" finds what percentage one number is of another (e.g. 30 is what % of 150). "Percent change" finds the percent increase or decrease between two numbers.

Yes — a negative result means a decrease. For example, a change from 100 to 80 shows as -20%.

Both require a non-zero denominator — "what percent" needs a non-zero total, and "percent change" needs a non-zero original value, since dividing by zero has no defined percentage.