Percentage Calculator (%) Online percentage calculator - calculate percentage online. Insert values and press the Calculate button: Percentage of a Value Calculation % of = Example: 40% of 200 = 40% × 200 = 80 Percentage Calculation of = % Example: 30 of 60 = 30 / 60 × 100 = 50% Percentage Change (increase/decrease) from to = % Example: percentage change from 60 to 80 = (80 / 60 × 100) - 100 = 33.33% increase See also Percentage (%) Percent to fraction Fraction to percent Percent to decimal Decimal to percent Percent to ppm ppm to percent Per-mille (‰) Parts-per million (ppm) Math symbols Write how to improve this page URL Name E-mail