Convert Millimeters to Inches
1 mm = 0.03937 in. Enter any value below.
Converted to every unit
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Millimeters to Inches formula
in = mm × 0.03937
A millimeter is one thousandth of a meter, used for small, precise measurements. An inch is exactly 2.54 centimeters; there are 12 inches in a foot.
Worked example
To convert 5 mm, multiply by 0.03937: 5 mm × 0.03937 = 0.19685 in.
Millimeters to Inches conversion table
| Millimeters | Inches |
|---|---|
| 1 mm | 0.03937 in |
| 2 mm | 0.07874 in |
| 3 mm | 0.11811 in |
| 4 mm | 0.15748 in |
| 5 mm | 0.19685 in |
| 6 mm | 0.23622 in |
| 7 mm | 0.275591 in |
| 8 mm | 0.314961 in |
| 9 mm | 0.354331 in |
| 10 mm | 0.393701 in |
| 12 mm | 0.472441 in |
| 15 mm | 0.590551 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 30 mm | 1.181102 in |
| 40 mm | 1.574803 in |
| 50 mm | 1.968504 in |
| 75 mm | 2.952756 in |
| 100 mm | 3.937008 in |
| 250 mm | 9.84252 in |
| 500 mm | 19.685039 in |
| 1,000 mm | 39.370079 in |
Frequently asked questions
How many inches are in a millimeter?
1 mm equals 0.03937 in.
How do I convert millimeters to inches?
Use the formula in = mm × 0.03937. For example, 5 mm = 0.19685 in.
Last reviewed: October 2026 · Uses exact, internationally defined conversion factors.