Percentage Calculator
Calculate percentages, ratios and percentage change instantly.
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20Result
Helpful guidance
Choose one of three common percentage questions, then enter X and Y.
The first mode finds X percent of Y; the second finds what percent X is of Y.
Percentage change compares an old value X with a new value Y and shows decreases as negative.
Frequently asked questions
How do I find 20% of 50?
Choose “X% of Y”, enter 20 and 50, and the result is 10.
How is percentage change calculated?
The difference between new and old values is divided by the absolute old value and multiplied by 100.
Why is division by zero rejected?
A ratio or change from zero has no finite percentage value.
Can values be negative?
Yes. Finite positive and negative numbers are accepted where the selected formula is defined.