Formulas and examples
Percent of: 15% of 240 = 15 / 100 x 240 = 36. What percent: 30 of 120 = 30 / 120 x 100 = 25%. Change: from 80 to 100 = (100 - 80) / 80 x 100 = 25%.
Calculators & Converters
Percentage Calculator
Calculate percent of a number, what percent one value is of another, and percentage increase or decrease.
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Fast percentage math with no signup.
Calculator
Calculate common percentages
Switch between percent-of, what-percent, and percentage change calculations without sending anything away from your browser.
Result36
15% of 240
FormulaPercent of
15 / 100 x 240
Local processing: Your percentage values are calculated in your browser. They are not uploaded to our server.
How to use this percentage calculator
Choose the calculation you need, enter the two values, and read the result with the matching formula. It works for discounts, markups, score comparisons, growth rates, and everyday percentage checks.
DiscountsGrowth ratesScore checksQuick math
Internal links
This tool belongs to the calculators and converters collection for quick browser-based math and planning.
FAQ
Which percentage calculations are included?
The calculator includes percent of a number, one value as a percent of another, and percentage increase or decrease from a starting value to an ending value.
How is percentage change calculated?
Percentage change is calculated as ending value minus starting value, divided by the absolute starting value, then multiplied by 100.
Does this calculator send my numbers anywhere?
No. The percentage calculations happen locally in your browser and do not require an account or server request.
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