Percent Converters

Convert between percentages, decimals, fractions, ratios, and common percentage-based units with simple, free online tools.

Percentage conversion tools

Choose a converter based on the number format you have and the format you need. Each tool shows the converted value and the basic conversion method.

Converters are being added: Start with the main Percentage Calculator for percentage-of, what-percent, percent-change, and reverse-percentage questions.

Common percentage conversions

A percentage represents a value out of 100. For example, 0.25 is 25%, 1/2 is 50%, and 75% can be written as 0.75.

Quick reference: To convert a decimal to a percentage, multiply by 100. To convert a percentage to a decimal, divide by 100.