Convert MM to Inches
Convert length units instantly: millimeters, centimeters, meters, kilometers, inches, feet, yards and miles.
Result
This page opens the length converter preset to millimeters → inches. One inch is exactly 25.4 millimeters, so the formula is inches = millimeters ÷ 25.4; one millimeter is about 0.03937 inches, close to 1/25 of an inch.
Practical anchors: 5 mm ≈ 0.197 in (just under 13/64), 10 mm ≈ 0.394 in, 25.4 mm = 1 in exactly, and 100 mm ≈ 3.937 in. A 6 mm drill bit is close to 15/64 in; standard 18 mm plywood is about 0.709 in, near the imperial 23/32 sheet.
Machinists, 3D-printing hobbyists, jewelers sizing stones and anyone matching metric fasteners to imperial tools rely on this conversion. Type millimeters to see inches instantly — and because the fields sync both ways, you can also enter a decimal inch value to get millimeters.