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ToolWrenThree everyday percentage calculations in one place: find X% of a number, work out what percentage one number is of another, and measure the percentage change between two values.
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Percentage is a free, private online tool that lets you calculate X% of Y, what percent X is of Y, and percentage increase or decrease between two numbers. It runs entirely in your browser, so nothing you enter is uploaded to a server.
Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.
Multiply to find a portion — e.g. 15% of 200 is 30. Useful for discounts, tips and tax.
Divide and scale to express one number as a percentage of another — e.g. 30 is 15% of 200. Useful for scores and progress.
Measure growth or decline: (new − old) ÷ old × 100. A change from 200 to 260 is a 30% increase.
A percentage is just a fraction out of 100, yet the three everyday percentage questions are easy to mix up: 'what is X% of Y?', 'X is what percent of Y?', and 'what is the percentage change from X to Y?'. This calculator puts all three in one place so you always use the right formula.
This finds a portion of a number — the maths behind discounts, tips, tax and commission. The formula is (X ÷ 100) × Y. For example, 15% of 200 is 0.15 × 200 = 30. It answers questions like 'how much is a 20% deposit on £250?' or 'what's an 8% sales tax on $45?'.
This expresses one number as a percentage of another — useful for scores, progress and proportions. The formula is (X ÷ Y) × 100. So 30 out of 200 is (30 ÷ 200) × 100 = 15%. It answers 'I scored 42 out of 50 — what percentage is that?' or 'we've raised £3,000 of a £10,000 goal — how far along are we?'.
This measures growth or decline between an old and a new value, the basis of price rises, investment returns and statistics. The formula is ((new − old) ÷ old) × 100. Going from 200 to 260 is ((260 − 200) ÷ 200) × 100 = 30% increase; a negative result is a decrease. A common pitfall: a 50% drop followed by a 50% rise does not return you to the start.
Work out discounts and final sale prices, tips and tax, exam and survey percentages, progress toward goals, and price or investment changes. All three calculators update live as you type, entirely in your browser.