Free Percentage Calculator
Calculate percentages, ratios, and percentage change instantly, no submit button needed.
Result
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How to use this tool
Pick the calculation you need using the tabs above the inputs. “X% of Y” finds a percentage of a number, “X is what % of Y” finds what percentage one number represents of another, and “% Increase/Decrease” finds the percentage change between two values.
Type numbers into either field and the result updates immediately as you type — there is no calculate button. Negative numbers and decimals are supported in every mode.
These calculations are common for figuring out discounts and sale prices, tips, exam or survey scores, and tracking growth or decline between two values such as revenue, weight, or prices.
FAQ
- How do I find X% of a number?
- Use the 'X% of Y' tab. Enter the percentage in the first field and the number in the second field, and the result updates instantly.
- How do I find what percent one number is of another?
- Use the 'X is what % of Y' tab. Enter the two numbers and the calculator divides X by Y and multiplies by 100.
- How is percentage increase or decrease calculated?
- The 'Increase/Decrease' tab calculates ((Y - X) / X) * 100, where X is the starting value and Y is the ending value. A positive result is an increase, a negative result is a decrease.
- Does this handle negative numbers and decimals?
- Yes. All three modes accept negative numbers and decimal values.