Unit Converters

Unit converters change a value from one unit to another using fixed conversion factors, with the factor and a worked example shown on each page. Start with the unit converter for everyday units, or go straight to the length converter, weight converter or temperature converter.

The converters are grouped by field. Common Converters holds single-pair pages such as cm to inches, kg to lbs and Celsius to Fahrenheit, plus general converters for volume, area, pressure, energy, speed and data storage. Engineering, Heat, Fluid, Light, Electricity, Magnetism and Radiology converters cover technical units such as torque, thermal conductivity, viscosity, illuminance, capacitance and absorbed dose. Other Converters covers SI prefixes, decibels, typography units and board feet.

Factors follow published definitions such as the international inch and pound. Check whether you need US or imperial units, since gallons, cups and mpg differ between the two.