1 in in millimetres
1 inches =
25.4 mm
Formula: mm = in × 25.4
How to convert 1 in to mm
- One inch is 25.4 mm.
- Multiply: 1 × 25.4 = 25.4 mm.
- To check, convert back: 25.4 mm is 1 in.
Convert another value
1 in in other units
- Millimetre25.4 mm
- Centimetre2.54 cm
- Metre0.0254 m
- Kilometre0.0000254 km
- Foot0.0833 ft
- Mile0.00001578 mi
Nearby values
| Inches | Millimetres |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 4 in | 101.6 mm |
| 5 in | 127 mm |
Questions
How many millimetres is 1 in?
1 in is 25.4 mm.
How do you convert 1 in to mm?
Use the formula mm = in × 25.4. For 1 in, that gives 25.4 mm.