Free Online Unit Converter
Convert between metric and imperial units across 10 categories. Choose a category, enter a value, and get instant conversions in every unit.
How to Use the Unit Converter
1. Choose a Category
Pick from length, weight, temperature, area, volume, speed, time, data storage, energy, or pressure.
2. Enter a Value and Unit
Type your value and select the unit you are converting from.
3. Read the Results
The highlighted result shows your conversion, and the list below shows the value in every other unit in that category.
About Unit Conversion
Unit conversion is the process of expressing a quantity in a different unit of measurement while keeping the underlying value identical. This is essential when working across the metric system (meters, kilograms, liters) and the imperial system (feet, pounds, gallons) used in the United States.
Our converter uses precise conversion factors. For example, 1 inch equals exactly 2.54 centimeters, 1 pound equals 0.45359237 kilograms, and 1 mile equals 1.609344 kilometers. Temperature uses the formulas °F = (°C × 9/5) + 32 and K = °C + 273.15.