mm to Inches Converter
Convert mm to in: 1 mm = 0.03937007874 in. Formula, worked example, table of common values and unit definitions.
Result1 in
1 mm = 0.03937007874 in
25.4 mm =
1 in
Formula
in = mm × 0.03937007874 mm = in × 25.4
Worked example
- 25.4 mm × 0.03937007874 = 1 in
Common values
| mm | in |
|---|---|
| 1 | 0.03937007874 |
| 6 | 0.2362204724 |
| 10 | 0.3937007874 |
| 25.4 | 1 |
| 50 | 1.968503937 |
| 100 | 3.937007874 |
| 300 | 11.81102362 |
Unit definitions
| Unit | Equals | What it is |
|---|---|---|
| mm | 0.001 m | Millimetre. Cable sizes, conductor diameters and drawings. |
| in | 0.0254 m | Inch, exactly 25.4 mm by definition. |
Frequently asked questions
How many in are in one mm?
1 mm = 0.03937007874 in.
What is the formula to convert mm to in?
in = mm × 0.03937007874. To go back, mm = in × 25.4.
Is the factor exact?
Yes. The inch is defined as exactly 25.4 mm, so 1 mm is 1/25.4 inch.
Related
Opposite direction: in to mm
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