Percentage Calculator
Three similar-looking questions, three different formulas. Choose the one that matches what you are comparing.
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Your result
How to use Percentage Calculator
- Enter your own input or try the example above.
- Choose the mode that matches your task. Results update as you edit; random generators run only when you choose Generate.
- Review the result, then copy or download it. Closing this tab discards the input.
Percent of a number
Part = percentage ÷ 100 × whole. A negative percentage or whole is allowed; the sign is retained. Always keep the original units with the answer.
Change needs a baseline
Change = (new − old) ÷ old × 100. This calculator requires a positive old value because a zero or negative baseline makes ordinary growth-language misleading.
Difference has no direction
Symmetric difference = |a − b| ÷ ((a + b) ÷ 2) × 100, for nonnegative values. It measures separation rather than growth. Two zeroes have zero difference by convention here.