One can just convert it themselves. For example 1 inch is 2.54cm, and one pound is .45kg. There are many conversion tables that can be found, both in print and online that give the full list of standard to metric conversions. Also many scientific calculators have the conversions built in so one just has to enter data and it converts it for them.
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kilometers
That depends what you are measuring. There are lots of different units to measure different things: length, area, volume, weight, mass, force, etc.
The difference between centimeters and inches is that inches is in the standard measuring system and centimeters is part of the metric measuring system.
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".
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