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Three calculators in one: percentage of a number, what percent one number is of another, and percent increase/decrease.
%
| Detail | 20% of 500 = 100 |
Three Ways to Think About Percentages
A percentage is just a fraction out of 100. "X% of Y" converts the percent to a decimal and multiplies it by Y (e.g. 20% of 500 = 0.20 × 500 = 100). "X is what % of Y" divides X by Y and multiplies by 100 to express the result as a percentage. Percent change compares an old and new value: it takes the difference between them, divides by the original value, and multiplies by 100 - a positive result is an increase, a negative result is a decrease.
% of = P × X ÷ 100
Where P is the base number and X is the percent
% Change = (New − Old) ÷ Old × 100