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Inches to millimetres (in to mm)
Type in either box: inches change to millimetres as you type, and back. One inch is exactly 25.4 mm.
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Quick table
Common inches to millimetres
| Inches (in) | Millimetres (mm) |
|---|---|
| 0.125 in | 3.175 mm |
| 0.25 in | 6.35 mm |
| 0.5 in | 12.7 mm |
| 0.75 in | 19.05 mm |
| 1 in | 25.4 mm |
| 1.5 in | 38.1 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 8 in | 203.2 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 18 in | 457.2 mm |
| 24 in | 609.6 mm |
| 36 in | 914.4 mm |
Questions
Good to know
How do I convert inches to millimetres?
Use this formula: mm = inches × 25.4. One inch is exactly 25.4 mm.
What is 1 in in mm?
1 in is 25.4 mm.
Need other units?
Use our length converter to see every unit at once.
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