Inch to Millimeter Conversion
1 Inch (in) equals 25.4 Millimeter (mm).
1 Inch = 25.4 Millimeter
How to convert Inch to Millimeter
Multiply the value in Inch by 25.4 to get Millimeter. To convert back from Millimeter to Inch, divide by 25.4 — or multiply by 0.03937007874.
mm = in × 25.4
Example: 25 in × 25.4 = 635 mm.
Inch to Millimeter conversion table
| Inch (in) | Millimeter (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 10 | 254 |
| 15 | 381 |
| 20 | 508 |
| 25 | 635 |
| 50 | 1,270 |
| 75 | 1,905 |
| 100 | 2,540 |
| 250 | 6,350 |
| 500 | 12,700 |
| 1,000 | 25,400 |
Frequently asked questions
What is 1 Inch in Millimeter?
1 Inch (in) is 25.4 Millimeter (mm).
What is 1 Millimeter in Inch?
1 Millimeter (mm) is 0.03937007874 Inch (in).
How do I convert Inch to Millimeter?
Multiply the value in Inch by 25.4. For example, 5 in × 25.4 = 127 mm. To go the other way, divide by 25.4.
How many units does the length converter support?
It converts between 14 units: Meter, Kilometer, Centimeter, Millimeter, Micrometer, Nanometer, Mile, Yard, Foot, Inch, Nautical Mile, Light-year, Fathom, Furlong.
More length conversions
- Meter to Foot
- Foot to Meter
- Kilometer to Mile
- Mile to Kilometer
- Centimeter to Inch
- Inch to Centimeter
- Meter to Yard
- Yard to Meter
- Millimeter to Inch
- Meter to Inch
- Inch to Meter
- Kilometer to Meter
- Meter to Kilometer
- Foot to Inch
- Inch to Foot
- Yard to Foot
- Foot to Yard
- Mile to Foot
- Foot to Mile
- Nautical Mile to Kilometer
- Kilometer to Nautical Mile
- Nautical Mile to Mile
- Mile to Nautical Mile
Full converter
For any other length unit, use the full Length Converter.