About mm to in
Handy for drill bits, bolts, rain totals, and 3D-printing tolerances when the plan is metric but your tools are imperial.
To convert, divide the value in millimeters by 25.4. For example, 12 mm = 0.472441 in.
Millimeters: one thousandth of a meter. Inches: exactly 2.54 cm.
Millimeters to inches conversion table
Formula: in = mm ÷ 25.4
| Millimeters | Inches |
|---|---|
| 1 mm | 0.0393701 in |
| 2 mm | 0.0787402 in |
| 3 mm | 0.11811 in |
| 5 mm | 0.19685 in |
| 6 mm | 0.23622 in |
| 8 mm | 0.314961 in |
| 10 mm | 0.393701 in |
| 12 mm | 0.472441 in |
| 15 mm | 0.590551 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 25.4 mm | 1 in |
| 50 mm | 1.9685 in |
| 100 mm | 3.93701 in |
Values rounded to 6 significant figures.
How to do it
- 1
Type a value in millimeters in the converter above (it is preset to mm → in).
- 2
Read the result instantly; tap Swap units to convert the other way.
- 3
Use the table for common values or the formula in = mm ÷ 25.4 to convert by hand.