Percentage Calculator
Three calculators in one: find X% of Y, work out what percent X is of Y, and calculate the percentage change between two values.
What is X% of Y?
20% of 150 is
30
X is what percent of Y?
30 is what % of 150
20%
Percentage change from X to Y
Percentage change
+25%
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Frequently asked questions
How is percentage change calculated?+
As ((new value − original value) / original value) × 100. A positive result means an increase; negative means a decrease.
What if the original value is zero?+
Percentage change and "what percent of" calculations are undefined when dividing by zero, so those fields will show no result.
Can I enter negative numbers?+
Yes, all three calculators accept negative values.