Percentage Calculator
Percent of, percent change, and percent increase.
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What is X% of Y?
A is what % of B / % change
20% of 150
30
80 is what % of 120?
66.67%
% change 80 → 120
50%
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How this calculator works
Formula
part = (percent/100) × whole ; change = (b − a)/a × 100
Method
Three modes: percent-of, ratio-to-percent, and percent change between two values.
Example
20% of 150 = 30. Going from 80 to 120 is a 50% increase.