How to use the Percentage Calculator
Choose the percentage calculation you need, enter the known values, and calculate the missing value. Enter the known values from the same problem and choose the percentage relationship you actually need. Percentages are unitless ratios, so keep the underlying quantities comparable.
What this calculator does
Calculate a percentage of a number, find what percentage one value is of another, or find a number from a percentage. It is intended to make the calculation transparent and repeatable: you provide the known values, the calculator applies the relevant relationship, and the result is shown with the units or labels used by the tool.
When this tool is useful
Use the Percentage Calculator when you need a quick, repeatable check and already have the inputs requested by the page. It is useful for comparing scenarios, checking hand calculations, planning a task, or understanding how changing one input affects the result.
How the calculation works
Percentage calculations use part ÷ whole × 100, or percentage ÷ 100 × whole, depending on which value is missing.
Practical example
For example, if you want 15% of 240, enter 15 as the percentage and 240 as the number. The calculator returns the portion represented by that percentage.
Things to keep in mind
- A percentage result depends on which value is treated as the whole or reference amount.
- Percentage points and percentage change are different concepts; use the dedicated Percentage Change Calculator when comparing an old value with a new value.
- Keep extra precision during the calculation and round the final result only as much as your use case requires.