Convert millimeters (mm) to inches (in) instantly. Our calculator uses the exact conversion factor: 1 millimeter = 0.0393701 inches.
To convert millimeters to inches, multiply the length in millimeters by 0.0393701. For quick estimates:
One inch
25.4 mm = 1 in
One foot
304.8 mm = 12 in
Thickness of a credit card
1 mm = 0.039 in
Standard pencil diameter
5 mm = 0.197 in
The millimeter is the smallest commonly used metric unit of length, equal to one thousandth of a meter. Common uses include:
The inch is the standard unit of length in the US and some other countries. One inch equals exactly 25.4 millimeters. Used for:
| Millimeters (mm) | Inches (in) |
|---|---|
| 10 | 0.394 |
| 20 | 0.787 |
| 30 | 1.181 |
| 40 | 1.575 |
| 50 | 1.969 |
| 60 | 2.362 |
| 70 | 2.756 |
| 80 | 3.15 |
| 90 | 3.543 |
| 100 | 3.937 |