| Millimetres (mm) | Inches (in) |
|---|
To convert millimetres to inches, divide by 25.4.
This conversion is exact because one inch is defined as exactly 25.4 mm.
Divide millimetres by 25.4 to convert to inches. For example, 50 mm equals 1.9685 inches. Because the inch is defined as exactly 25.4 mm, this is a precise conversion used in engineering and manufacturing.
To convert inches back to millimetres, multiply by 25.4. This makes it easy to switch between metric drawings and imperial tools.
Useful for hardware sizing, woodworking, 3D printing, machining, and reading product specs where drawings and components may use different unit systems.
1 inch equals exactly 25.4 mm.
10 mm is approximately 0.3937 inches.
Yes, the base relationship is exact.
100 mm is approximately 3.937 inches.
Yes, this page also shows decimal and practical fractional interpretations.