Convert mm to inches
1 mm = 0.0393701 in
1 in = 25.4 mm
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How to convert mm to inches
Divide the value in mm by 25.4 to get inches. As a formula: in = mm ÷ 25.4
Good to know
An inch is exactly 25.4 mm. Tools, drill bits and fasteners are often sold in both systems, and the metric size is rarely an exact match for the imperial one: a 1/4-inch bit is 6.35 mm, not 6 mm.
mm to inches conversion table
| mm (mm) | inches (in) |
|---|---|
| 1 mm | 0.0393701 in |
| 2 mm | 0.0787402 in |
| 3 mm | 0.11811 in |
| 4 mm | 0.15748 in |
| 5 mm | 0.19685 in |
| 6 mm | 0.23622 in |
| 8 mm | 0.314961 in |
| 9 mm | 0.354331 in |
| 10 mm | 0.393701 in |
| 12 mm | 0.472441 in |
| 14 mm | 0.551181 in |
| 15 mm | 0.590551 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.9685 in |
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Need other units? The full Length Converter converts between every unit it supports, and the Unit Converters page lists the rest.
mm to inches — questions
How many inches are in 1 mm?
1 mm = 0.0393701 in. Divide the value in mm by 25.4 to get inches.
How do I convert mm to inches?
Divide the value in mm by 25.4. For example, 4 mm ÷ 25.4 = 0.15748 in.
What is 4 mm in inches?
4 mm = 0.15748 in.
What is 8 mm in inches?
8 mm = 0.314961 in.
What is 9 mm in inches?
9 mm = 0.354331 in.
What is 12 mm in inches?
12 mm = 0.472441 in.