Percentage Calculator
What is X% of Y?
What is
% of
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X is what % of Y?
is what % of
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Percentage Change
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Percentage Increase/Decrease
Increase/decrease
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Free Online Percentage Calculator
Calculate percentages instantly with four common calculation types: find a percentage of a number, determine what percentage one number is of another, compute percentage change between two values, or increase/decrease a number by a given percentage.
How to Use
Enter your numbers into any of the four calculator sections above and click Calculate. All calculations happen instantly in your browser — no data is sent anywhere.
Percentage Formulas
- X% of Y = (X / 100) × Y
- X is what % of Y = (X / Y) × 100
- Percentage change = ((New − Old) / |Old|) × 100
- Increase by X% = Value × (1 + X / 100)
- Decrease by X% = Value × (1 − X / 100)
Frequently Asked Questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 200 = (15 / 100) × 200 = 30.
What is the difference between percentage change and percentage points?
Percentage change is relative (e.g., going from 50 to 75 is a 50% increase). Percentage points are absolute (e.g., an interest rate going from 3% to 5% is a 2 percentage point increase, but a 66.7% relative increase).