Units of length such as kilometre, metre, centimetre, and millimetre should begin with a lowercase letter, and their symbols (km, m, cm, mm) are also lowercase. They are never followed by ‘s’ for the plural.
Chapter 5 Measurement of length and motion
Class VI NCERT Book Curiosity Science
How should units of length like kilometre and metre be written in terms of capitalization and pluralization?
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Units of length such as kilo-metre, metre, centi-metre, and milli-metre should be written in lowercase, except at the beginning of a sentence. Their symbols (km, m, cm, mm) are also lowercase and should not be followed by an ‘s’ for pluralization.