Percentage Calculator Online
Runs 100% in your browser — your files never leave your device.
Discounts, tips, growth rates, grade curves — percentage math is daily life, and the questions people ask are always one of the same three. This calculator answers all of them side by side with live results as you type: what is X% of Y, X is what percent of Y, and the percent change from X to Y.
How it works
- 1
Pick your question
Three cards cover the three percentage questions: of, is-what-percent, and change.
- 2
Type the numbers
Results appear live as you type — no equals button needed.
- 3
Read the answer
Undefined cases (like change from zero) explain themselves instead of failing silently.
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