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Percentage Calculator
Calculate percentages easily. Find X% of Y, percentage increase or decrease, and reverse percentage problems.
How to use this tool
- Use X% of Y to calculate a direct percentage value from two inputs.
- Use X is what % of Y to convert part-to-whole values into a percentage.
- Use Percentage Change to compare before and after values, then copy or download the summary.
Common use cases
- Calculate discounts, taxes, commissions, and markups.
- Measure percentage growth or decline across reporting periods.
- Translate raw numbers into easier-to-compare percentage metrics.
Calculation notes
- Results are rounded to two decimal places for quick readability.
- Division-by-zero scenarios display a fallback instead of a numeric output.
- Percent change uses (to - from) / from × 100.
FAQ
- Can I use decimal values?
- Yes. Inputs accept decimals, and outputs are formatted to two decimal places.
- Why does percentage change show a dash?
- A dash appears when the calculation is not finite, such as when the baseline value is zero.
- Can I save the output?
- Yes. Use Copy All for clipboard output or Download for a text file export.
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