Millimetre
Unit of length 1/1000 of a metre / From Wikipedia, the free encyclopedia
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Further information: Metre
The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length. Therefore, there are one thousand millimetres in a metre. There are ten millimetres in a centimetre.
Quick Facts General information, Unit system ...
millimetre | |
---|---|
General information | |
Unit system | SI |
Unit of | Length |
Symbol | mm |
Named after | The metric prefix mille (Latin for "one thousand") and the metre |
Conversions | |
1 mm in ... | ... is equal to ... |
micrometres | 1×103 μm = 1000 μm |
centimetres | 1×10−1 cm = 0.1 cm |
metres | 1×10−3 m = 0.001 m |
kilometres | 1×10−6 km |
inches | 0.039370 in |
feet | 0.0032808 ft |
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One millimetre is equal to 1000 micrometres or 1000000 nanometres. Since an inch is officially defined as exactly 25.4 millimetres, a millimetre is equal to exactly 5⁄127 (≈ 0.03937) of an inch.