Percentage Calculator
Calculate percentages, find what % one number is of another, and compute % change.
Percentage Calculator
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How to Use
- Choose a mode: "X% of Y", "X is what % of Y?", or "% Change".
- Enter your values in the input fields.
- The result updates instantly — no need to click Calculate.
- Switch between modes anytime without losing your inputs.
Frequently Asked Questions
QHow do I find X% of a number?
Multiply the number by X and divide by 100. For example, 15% of 200 = 200 × 15 ÷ 100 = 30.
QHow do I calculate percentage increase?
Percentage increase = ((New Value − Old Value) ÷ Old Value) × 100. For example, from 80 to 100 = ((100 − 80) ÷ 80) × 100 = 25%.
QWhat is a percentage?
A percentage is a number expressed as a fraction of 100. The word comes from the Latin "per centum" meaning "by the hundred".
About This Calculator
All calculations use standard arithmetic. Percentage change correctly distinguishes increase (positive) from decrease (negative) and shows the absolute difference alongside the percentage.