Percentage Calculator
FreeThree percentage calculations side by side: a percentage of a number, one number as a percentage of another, and the change between two values.
How to use Percentage Calculator
- 1Pick the calculation that matches your question.
- 2Enter the two numbers.
- 3Read the answer, which updates as you type.
Private by design. This tool runs in your browser. Nothing you enter or add is uploaded.
Frequently asked questions
How is percentage change calculated?
Subtract the old value from the new value, divide by the old value, and multiply by 100. A negative result is a decrease.
Why is percentage change undefined when the starting value is zero?
Because the formula divides by the starting value, and division by zero has no answer.
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