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A Customary Unit or non-SI unit is a measurement unit that is not part of the metric system. Customary units are mainly units of the Imperial system but they could be localised customary units - such as Gaj (for area) is South Asia.
gaga
It depends on what you consider to be "customary" and what you wish to convert them to.
Fahrenheit, if you're talking about U.S. Customary units.
Customary Units