Percentage calculator
Three quick tools in one — find a percentage of a number, what percent one number is of another, and percentage change.
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What is X% of Y?
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X is what percent of Y?
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Percentage increase / decrease
Change
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Percentage formulas
- X% of Y = (X ÷ 100) × Y
- X as a percent of Y = (X ÷ Y) × 100
- Percent change = ((New − Old) ÷ Old) × 100
The donut chart above the first tool shows exactly what your chosen percentage looks like as a slice of the whole — a quick visual check that the number "feels right" before you use it.
Everyday uses for percentages
- Shopping discounts — "X% of Y" tells you exactly how much you save on a sale price.
- Restaurant tips — see our dedicated tip calculator for a faster, purpose-built version.
- Exam scores — "X is what percent of Y" converts a raw score into a percentage grade.
- Pay rises and price changes — the increase/decrease tool shows the exact percentage change between two numbers, e.g. how to calculate a percentage increase.
Percentages appear everywhere in daily life — discounts while shopping, tips at restaurants, tax rates, exam scores and interest rates. Bookmark this page for instant answers.
Frequently asked questions
How do I calculate X% of Y?
Multiply Y by X and divide by 100 — e.g. 15% of 200 = (15 ÷ 100) × 200 = 30.
How do I find what percent X is of Y?
Divide X by Y and multiply by 100 — e.g. 30 is 20% of 150.
How do I calculate percentage increase or decrease?
(New − Old) ÷ Old × 100. A positive result is an increase; negative is a decrease.