CalcLibrary

Percentage Calculator

Calculate percentages easily: find X% of Y, what percent X is of Y, or percent change between values.

%
Examples

Find a quarter of 200

Amount
50

25% of 200 is 50.

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Examples

How It Works

Formula

X% of Y=X100×YX\% \text{ of } Y = \frac{X}{100} \times Y

X as a % of Y=XY×100X \text{ as a \% of } Y = \frac{X}{Y} \times 100

% change=Y−X∣X∣×100\%\text{ change} = \frac{Y - X}{|X|} \times 100

Variables

XX

First value (the percentage in mode 1, original value in mode 3)

YY

Second value (the base in modes 1 & 2, new value in mode 3)

Select one of three modes: (1) find X% of Y by multiplying Y by X/100, (2) find what percent X is of Y by dividing X by Y and multiplying by 100, (3) find percent change from X to Y using (Y−X)/|X| × 100.

Frequently Asked Questions

01How do I find X% of a number?
Multiply the number by X/100. For example, 25% of 200 = 200 × 0.25 = 50.
02How do I find what percent X is of Y?
Divide X by Y and multiply by 100. For example, 50 is (50/200) × 100 = 25% of 200.
03How is percent change calculated?
Percent change = ((New − Old) / |Old|) × 100. A positive result means increase, negative means decrease.
04What does percent mean?
Percent means "per hundred." 25% means 25 out of 100, or the fraction 25/100 = 0.25.
05Can percent change be more than 100%?
Yes. If a value doubles, the percent change is 100%. If it triples, the change is 200%.

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