MM to Inches Converter: Precise Measurement Conversion with Fraction Option

Convert millimeters to inches fast: divide by 25.4—every 1 mm equals 0.03937 in (NIST SP 811, 2020). Enter any positive mm value, pick decimal or fraction output, and hit Convert. A 57 mm entry returns 2.24 in or 2 ¼ in; 254.3 mm shows 10.012 in. Free, mobile-friendly tool—ideal for shop, lab, or class.