Millimeters to Inches
1 millimeter is 0.0393701 inches.
- To convert millimeters to inches, multiply the number of millimeters by 0.0393701 — or, equivalently, divide by 25.4.
- Going the other way, 1 inch is 25.4 millimeters.
- For example, 15 millimeters is 0.5906 inches.
Conversion
Millimeters → Inches
0.590551
15 millimeters equals this many inches
Pre-filled for this page. Open the full Unit Converter for every option.
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 | 0.03937 |
| 2 | 0.07874 |
| 3 | 0.1181 |
| 5 | 0.1969 |
| 6 | 0.2362 |
| 8 | 0.315 |
| 10 | 0.3937 |
| 12 | 0.4724 |
| 15 | 0.5906 |
| 20 | 0.7874 |
| 25 | 0.9843 |
| 30 | 1.18 |
| 40 | 1.57 |
| 50 | 1.97 |
| 100 | 3.94 |
| 300 | 11.81 |
About millimeters and inches
Millimeters dominate engineering drawings, drill bits, and fasteners worldwide, while U.S. tools are often sized in fractions of an inch. 25.4 mm is exactly one inch, so a 6 mm bit is just under 1/4 inch (6.35 mm).
Frequently asked questions
- How many inches are in a millimeter?
- There are 0.0393701 inches in one millimeter. To convert millimeters to inches, multiply the number of millimeters by 0.0393701 — or, equivalently, divide by 25.4.
- How do I convert 15 millimeters to inches?
- Multiply 15 by 0.0393701: 15 millimeters is 0.5906 inches.
- How many millimeters are in an inch?
- Exactly 25.4 mm. That is why a 1/4-inch part measures 6.35 mm and a 1/2-inch part 12.7 mm.