How Percentages Work
A percentage expresses a value as a part of 100. Use the calculator modes to find a percentage of a number, determine what percentage one number is of another, or calculate percentage change.
Formula
Percentage = Part ÷ Whole × 100
Example
Twenty percent of 250 is 50.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology