Convert Millimeters Milimetres mm Units Calculator
Millimeter mm conversion calculator.
The millimetre (International spelling as used by the International Bureau of Weights and Measures) or millimeter (American spelling) (SI unit symbol mm) is a unit of length in the metric system, equal to one thousandth of a meter, which is the SI base unit of length.
It is equal to 1,000 micrometres and 1,000,000 nanometres. There are 25.4 mm in one inch by definition, so a millimetre is exactly equal to 5⁄127 inch.
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