Percentage Calculator
Calculate a percentage of a value, a value's share of a total, or a percentage change.
Enter values
Result
About this tool
Switch between three common percentage calculations without rewriting a formula. It is useful for comparisons, reports, and checking changes between two values.
Percentage change uses the absolute value of the starting number as its reference. A change from zero is undefined, so the tool shows an error instead of a misleading result.
Frequently asked questions
Can I use decimals and negative numbers?
Yes. Decimals and negative values are supported, and floating-point noise is removed from the displayed result.
What happens when the starting value is zero?
A conventional percentage change from zero is undefined, so the tool displays an error.
Are my values saved?
No. Values are not saved, and the calculation runs entirely in your browser.
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