A percentage calculator answers three questions: what is X% of Y, X is what percent of Y, and the percentage change between two numbers. For example, 15% of 120 is 18 — multiply 120 by 0.15.
A percentage calculator answers three questions: what is X% of Y, X is what percent of Y, and the percentage change between two numbers. For example, 15% of 120 is 18 — multiply 120 by 0.15. Our percentage calculator is built on the same core calculate percentage online percent change calculator what is percentage of number and is trusted by students, professionals and everyday users who need a fast, accurate result. Because every calculation runs locally in your browser, there is no waiting, no sign-up and no limit on how often you use it.
Three Ways to Calculate Percentages
Our percentage calculator offers three powerful modes: Mode 1 (X% of Y) answers questions like "What is 20% of 150?", Mode 2 (X is what % of Y) solves "40 is what percent of 200?", and Mode 3 (% Change) calculates growth or reduction between two values.
How to Calculate Percentage Manually
To find X% of Y: multiply Y by X then divide by 100. Example: 15% of 80 = (80 × 15) ÷ 100 = 12. To find what percent X is of Y: divide X by Y then multiply by 100. For percentage change: ((New − Old) ÷ |Old|) × 100.
Common Everyday Percentage Uses
Percentage calculations are essential in finance (interest rates, discounts, tips), academic test scoring, business profit margins, and health metrics.
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