How to convert millimeters to inches
- Type the value in millimeters (mm) in the box above.
- The result in inches appears instantly, along with the same value in every other unit of length.
- Press ⇄ to convert the other way.
Formula
inches = millimeters ÷ 25.4. So 1 mm = 0.03937 in, and 10 mm = 0.393701 in.
Millimetres to inches matters for drill bits, bolts and wrenches, jewellery and ring widths, rainfall totals, camera lenses and 3D printing. One inch is exactly 25.4 mm, so divide by 25.4. Workshops often use the nearest fraction: 3 mm ≈ 1/8 in, 6 mm ≈ 1/4 in, 10 mm ≈ 3/8 in, 13 mm ≈ 1/2 in and 19 mm ≈ 3/4 in.
mm to in conversion chart
| Millimeters | Inches |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 3 mm | 0.11811 in |
| 5 mm | 0.19685 in |
| 6 mm | 0.23622 in |
| 8 mm | 0.314961 in |
| 10 mm | 0.393701 in |
| 12 mm | 0.472441 in |
| 16 mm | 0.629921 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.9685 in |
FAQ
Is 6 mm the same as 1/4 inch?
Close but not equal: 1/4 in is 6.35 mm, so a 6 mm bit is 0.35 mm smaller.
How do I convert mm to in?
Use inches = millimeters ÷ 25.4. Or type the value above and the converter does it for you.
How do I convert in back to mm?
Multiply by 25.4, or press the ⇄ button in the converter.