% of
is what % of
= % change
About the Percentage Calculator
The Percentage Calculator answers the three everyday percent questions in one place: what is X% of Y, X is what percent of Y, and the percentage increase or decrease between two values.
Change = (new − old) ÷ old × 100. Going from 50 to 75 is +50%; going from 75 to 50 is −33.3%.