Percentage Calculator
Use five common percentage formulas without switching between separate tools.
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Percentage Calculator formula
Percentage value = total × percentage ÷ 100. Percentage change = (new − old) ÷ old × 100.
Worked example
15% of 240 is 36 because 240 × 15 ÷ 100 = 36.
How to use this calculator
- Choose the percentage calculation you need.
- Enter the labeled values.
- Copy the formatted result.
Important assumptions and limitations
A percentage comparison cannot divide by zero. Results are rounded only for display.
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Frequently asked questions
Can percentages be negative?
Yes. Negative percentages are accepted where they have a mathematical meaning.
How is percentage change calculated?
The difference is divided by the original value, then multiplied by 100.