Comparison of the imperial and US customary measurement systems information
For a topical guide, see Imperial and US customary measurement systems.
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A baby bottle with measurements in metric, imperial and US customaryA one-US-gallon petrol can purchased near the US–Canada border showing equivalents in imperial gallons and litres
Both the British imperial measurement system and United States customary systems of measurement derive from earlier English unit systems used prior to 1824 that were the result of a combination of the local Anglo-Saxon units inherited from Germanic tribes and Roman units.
Having this shared heritage, the two systems are quite similar, but there are differences. The US customary system is based on English systems of the 18th century, while the imperial system was defined in 1824, almost a half-century after American independence.
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