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What this calculator does
Calculate a percentage of a number or find what percentage one value is of another.
How to use this calculator
- Choose the question you need and enter both values.
- Review the calculation assumptions before using the result.
- The result expresses the relationship as a percentage.
How to calculate
Choose the calculation mode where available, then enter the values requested by the percentage calculator. Results update immediately.
Worked example
With the example values shown above, the result is 20.
Understanding your result
The result expresses the relationship as a percentage.
- Check whether the base value is the correct reference.
- Double-check values and units before calculating.
Frequently asked questions
What does this percentage calculator do?
Calculate a percentage of a number or find what percentage one value is of another.
How do I use this percentage calculator?
Choose the question you need and enter both values.
What does the result mean?
The result expresses the relationship as a percentage.
What should I check before relying on it?
Check whether the base value is the correct reference.
How do I find what percent one number is of another?
Choose the 'x is what percent of y?' mode and enter both values — the calculator divides x by y and multiplies by 100.
How do I find the original number from a percentage?
Choose the 'x is p% of what?' mode, enter the known amount and percentage, and the calculator solves for the original base value.
Can I use this for a percentage increase or decrease?
Yes — choose the 'increase or decrease x by p%' mode to add or subtract a percentage from a starting value in one step.