Number of mm in an Inch

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How many millimeters are there in an inch?


According to the ‘Å“Guide for the Use of the International System of Units (SI)’, published by the National Institute of Standards and Technology (NIST), one inch is equivalent to 25.4 millimeters. The inch belongs to the US customary units, whereas the millimeter belongs to the metric units (or International System of Units – SI).

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