Percentage Calculator
Runs locallyThree everyday percentage questions, answered instantly: X% of Y, X is what % of Y, and % change.
What is % of = ?
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is what % of
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Change from to
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Answer the three percentage questions that come up all the time: What is X% of Y? X is what percent of Y? What is the percentage change from X to Y? Results update as you type. Runs locally in your browser.
Frequently asked questions
Which three questions does it answer?
What is X% of Y (tips, discounts), X is what percent of Y (scores, rates), and the percentage change from X to Y (growth, price moves).
How do I work out a discount?
Use the first mode: 20% of 80 is 16 — that is your saving, so you pay 64. For markup, use percentage change from old price to new.
Does it work offline?
Yes. Once the page is loaded, every calculation runs in your browser — no connection needed.