Length conversion
1 mm to in
0.0394 in
1 millimetres = 0.0394 inches. Exact factor: in = mm ÷ 25.4.
Live converter
Edit either field — the other updates instantly. Type decimal values like 38.4.
The formula
in = mm ÷ 25.4
Worked example: 1 × 0.0393700787 = 0.0394 in.
Values near 1 mm
| mm | in |
|---|---|
| 0.25 | 0.0098 |
| 0.5 | 0.0197 |
| 0.75 | 0.0295 |
| 1this page | 0.0394 |
| 1.25 | 0.0492 |
| 1.5 | 0.0591 |
| 1.75 | 0.0689 |
Frequently asked
How do you convert millimetres to inches?
Apply the formula in = mm ÷ 25.4. Enter any value in the live converter above and the result updates as you type.
What is 1 mm in in?
1 mm equals 0.0394 in. The reference table below shows the values immediately around 1 mm.
Is this conversion exact?
Yes. Hardware, drill bits and camera lenses are specified in millimetres almost everywhere, including in the US.