The short answer
- 1 mm ≈ 0.03937008 in
- 1 in = 25.4 mm
Worked example25 mm ÷ 25.4 = 0.984252 in
UNIT CONVERSION
← Length converterMillimetres to inches
To convert millimetres to inches, divide the number of millimetres by 25.4.
What the units mean
Millimetre. The millimetre is one thousandth of a metre.
Inch. The inch is exactly 2.54 centimetres, fixed by the international yard and pound agreement of 1959. There are 12 inches in a foot.
Millimetres to inches table
| Millimetres (mm) | Inches (in) |
|---|---|
| 0.5 | 0.01968504 |
| 1 | 0.03937008 |
| 2 | 0.07874016 |
| 3 | 0.1181102 |
| 4 | 0.1574803 |
| 5 | 0.1968504 |
| 6 | 0.2362205 |
| 7 | 0.2755906 |
| 8 | 0.3149606 |
| 9 | 0.3543307 |
| 10 | 0.3937008 |
| 12 | 0.4724409 |
| 15 | 0.5905512 |
| 20 | 0.7874016 |
| 25 | 0.984252 |
| 30 | 1.181102 |
| 40 | 1.574803 |
| 50 | 1.968504 |
| 60 | 2.362205 |
| 70 | 2.755906 |
| 75 | 2.952756 |
| 80 | 3.149606 |
| 90 | 3.543307 |
| 100 | 3.937008 |
| 150 | 5.905512 |
| 200 | 7.874016 |
| 250 | 9.84252 |
| 500 | 19.68504 |
| 1,000 | 39.37008 |
Values are rounded to 7 significant figures.
Common questions
How do I convert millimetres to inches?
Divide the number of millimetres by 25.4. For example, 25 mm ÷ 25.4 = 0.984252 in.
How many inches are in one millimetre?
One millimetre is about 0.03937008 inches.
Is this conversion exact?
Yes. Both units have exact legal definitions, so the factor is exact. Values on this page are rounded to 7 significant figures.