| Convert Between US/Imperial & Metric Units | |
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| Select Measurand |
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User Guide
Use this tool to convert between us / imperial and metric units for measurements of length, area, volume, speed, temperature, mass, force, and pressure.
Select the measurand you wish to convert, then choose between converting to metric units or us/imperial units, and then select the units required before entering the value to convert.
#Tip – If you have a series of unit conversions that you need to make on a regular basis, you can go through as many measurands as you like and select the required units, and then click the save settings button to create a unique URL link to bookmark in your browser, to quickly access your pre-selected converters in the future.
US & Imperial units are mostly used in the USA and a few other countries. For the most part, US units represent the same quantity as Imperial units. However there are differences when it comes to some units of volume and weight, such as gallons, pints, fluid ounces, hundredweight and tonnes, which all have different values for use in the USA and the UK.
Metric units are more widely used internationally, particularly in European countries where the metric system originated. It is also used by the scientific community, and SI units (International System of Units) on which all measurement standards are based and controlled, is based on the metric unit system.
In some countries such as the UK they are used alongside the metric unit system, and the weighting of usage of each units varies depending on the measurand and the application e.g. mph (mile per hour) which is an imperial unit of speed is predominantly used instead of the metric kph (kilometres per hour), whereas metric units cc (cubic centimetres) and L (litres) are always used instead of the imperial unit cu in (cubic inches).