Percentage calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
part = (percent ÷ 100) × whole
Where this usually goes wrong
Leave any one box empty. "15 is what percent of 60" means filling in part and whole.
Worked example
15 out of 60 is 25%.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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