Percentage Calculator
Calculate percentages instantly. Find what percent of a number is, percentage increase/decrease, and convert between fractions and percentages.
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What is X% of Y?
X is what % of Y?
Percentage Change
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X% of Y =
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X is __% of Y
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Percentage Change
How to Calculate Percentages
A percentage is a fraction of 100. The word comes from Latin "per centum" meaning "by the hundred." The three most common percentage calculations are finding a percentage of a number, finding what percentage one number is of another, and calculating percentage change.
Finding X% of Y
Multiply Y by X/100. Example: 15% of 200 = 200 × 0.15 = 30.
Finding What % X Is of Y
Divide X by Y and multiply by 100. Example: 30 is what % of 200? → 30 ÷ 200 × 100 = 15%.
Percentage Change
((New - Original) ÷ Original) × 100. Example: From 80 to 100 → (100-80) ÷ 80 × 100 = 25% increase.
Frequently Asked Questions
How do I calculate a percentage?
To find X% of Y: multiply Y by X/100. To find what % X is of Y: divide X by Y and multiply by 100.
What is percentage change?
Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result means increase; negative means decrease.
How do I convert a fraction to a percentage?
Divide the numerator by the denominator and multiply by 100. Example: 3/4 = 0.75 × 100 = 75%.