Percentage Calculator
Free online percentage calculator. Instantly compute what is X% of Y, percentage change, increase/decrease and percentage of a total. No signup needed.
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What is X% of Y?
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X is what % of Y?
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How to Calculate Percentages
A percentage is a ratio expressed as a fraction of 100. The word "percent" comes from the Latin "per centum" meaning "by the hundred."
Common Percentage Formulas
- X% of Y = (X/100) × Y — e.g., 15% of 200 = 30
- X is what % of Y = (X/Y) × 100 — e.g., 30 is 15% of 200
- % Change = ((New-Old)/Old) × 100 — shows increase or decrease