--- title: "1 mm to in = 0.03937 in" description: "1 millimeter is 0.03937 inches. The arithmetic, a table of nearby values, and a converter for any other number." url: https://atoneplace.net/convert/1-mm-to-inches/ site: "At One Place" --- # 1 mm to in **1 millimeter in inches: 1 mm = 0.03937 in** in = mm × 0.03937007874 1 millimeter is 0.03937 inches. To get there, multiply by 0.03937007874. ## Values either side *Millimeters near 1, converted to inches.* | Millimeters | Inches | | --- | --- | | 0.5 mm | 0.019685 | | 1 mm ← | 0.03937 | | 1.5 mm | 0.059055 | | 2 mm | 0.07874 | | 2.5 mm | 0.098425 | | 3 mm | 0.11811 | ## How the conversion works The relationship is in = mm × 0.03937007874. Both units measure length, so the conversion is a fixed factor that never changes. The figure is exact rather than approximate: since the international yard and pound agreement of 1959, an inch is defined as exactly 25.4 millimetres and a pound as exactly 0.45359237 kilograms, and every other imperial and US customary unit here is derived from those two. ## Common questions ### What is 1 mm in inches? 1 mm is 0.03937 in. ### How do you convert millimeters to inches? Multiply by 0.03937007874. ## Related pages - [Millimeters to inches](https://atoneplace.net/convert/mm-to-inches/) - [1 in to mm](https://atoneplace.net/convert/1-inches-to-mm/) - [0.5 mm to in](https://atoneplace.net/convert/0-5-mm-to-inches/) - [1.5 mm to in](https://atoneplace.net/convert/1-5-mm-to-inches/) - [2 mm to in](https://atoneplace.net/convert/2-mm-to-inches/) - [2.5 mm to in](https://atoneplace.net/convert/2-5-mm-to-inches/) - [3 mm to in](https://atoneplace.net/convert/3-mm-to-inches/) ## Sources - Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)] - The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure) - Calculated on this page — At One Place (/about/)