Percentage Calculator
Calculate percentages instantly: what is X% of Y, percentage change, and what percent one number is of another. Free tool.
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Frequently asked questions
- How do I calculate a percentage of a number?
- Enter the percentage in the first field and the value in the second, and the result appears instantly. For example, 15% of 200 shows 30.
- What is the reverse calculation?
- It shows what percent the second number is of the first, which answers questions like 200 is what percent of 15.
- How is percentage change calculated?
- The tool computes the new value minus the old value, divided by the old value, times 100, and labels the result as an increase or a decrease.
- Can I enter decimals?
- Yes. Both inputs accept decimal values and all results are rounded to two decimal places.
This tool runs entirely in your browser. No data is uploaded anywhere.