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Percentage calculator
Three common percentage questions. Change any number and the answer updates.
What is % of ?
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is what percent of ?
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Change from to
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The three formulas
Percent of a number: multiply the number by the percent and divide by 100. What percent: divide the part by the whole and multiply by 100. Percent change: subtract the old value from the new one, divide by the old value and multiply by 100.
A rise from 80 to 100 is a 25% increase, but a fall from 100 back to 80 is a 20% decrease. The base number is different, so the percentages are too.