All of them. Whatever units a country uses are 'customary' in that country.
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It is a converter to the metric system, an international decimalised system of measurement, that is the common system of measuring units used by most of the world. Scroll down to related links and look at "Countries where the metric system is official are shown in green".
Convert the non-metric units to metric. It is a converter to the metric system, an international decimalised system of measurement, that is the common system of measuring units used by most of the world. Scroll down to related links and look at "Countries where the metric system is official are shown in green".
The US and the UK.
It is a measure of volume in the Imperial system, a measurement system which is now obsolete in all but a few recalcitrant countries.
metric system