How to Calculate a Percentage

How to find a percentage of a number

To calculate a percentage of a number, convert the percentage to a decimal and multiply it by the number.

For example, 20% written as a decimal is 0.20. Twenty percent of $50 is therefore $10.

How to calculate a percentage increase

A percentage increase compares the amount of change with the original value. The change is divided by the original value and multiplied by 100 to express the result as a percentage.

How to calculate a percentage decrease

A percentage decrease is calculated by comparing the reduction with the original value. This is commonly used for discounts, price reductions, and changes in quantities.