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Sun, 03 May 2026 21:56:12 +0000

The millimetre (SI symbol: mm; international spelling) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, the SI base unit of length. Millimeters to Inches (mm to inches) conversion calculator for length conversions with additional tables and formulas. A millimeter (mm) is a very small unit of length in the metric system, equal to one-thousandth of a meter. It is about the thickness of a dime or a paperclip wi Definition: A millimeter (symbol: mm) is a unit of length in the International System of Units (SI). It is defined in terms of the meter, as 1/1000 of a meter, or the distance traveled by light in 1/299 792 458.