Usually people use the metric system, some (like people of the United States) use the English system.
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It depends on what you consider to be "customary" and what you wish to convert them to.
In the SI system (metric), length is a meter, mass is the kilogram, and time is the second.
to be for real i truly don't know but first you need to make the units the same and that's called renaming the you subtract
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.
SI units is what we use in the United States for the common unit of measurement for matter.