Percentage Calculator
Calculate X% of Y, what percent X is of Y, or the percent change from X to Y — three common percentage questions, one tool, instantly, in your browser.
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Calculate three common percentage questions: what X% of Y is, what percent X is of Y, or the percent change from X to Y. Choose your question below — the result updates instantly, entirely in your browser.
Formulas
- X% of Y:
(X ÷ 100) × Y. Example: 20% of 50 = (20 ÷ 100) × 50 = 10. - X is what % of Y:
(X ÷ Y) × 100. Example: 10 is (10 ÷ 50) × 100 = 20% of 50. - Percent change from X to Y:
((Y − X) ÷ |X|) × 100. Example: from 50 to 75 is a 50% increase.
FAQs
What’s the difference between “% of” and “% change”?
“X% of Y” answers a proportion question (like a tip or a discount). “% change” answers how much something grew or shrank between two values — a completely different calculation that people often reach for the wrong tool to answer.