How to convert inches to millimetres
1 inch = 25.4 millimetres and 1 millimetre = 0.0393700787 inches. To convert inches to millimetres, multiply by 25.4:
mm = in × 25.4
Examples
- 0.5 in × 25.4 = 12.7 mm
- 2 in × 25.4 = 50.8 mm
- 10 in × 25.4 = 254 mm
in to mm conversion table
| Inches (in) | Millimetres (mm) |
|---|---|
| 1 in | 25.4 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 |
| 7 in | 177.8 mm |
| 8 in | 203.2 mm |
| 9 in | 228.6 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 15 in | 381 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 30 in | 762 mm |
| 40 in | 1,016 mm |
| 50 in | 1,270 mm |
| 60 in | 1,524 mm |
| 70 in | 1,778 mm |
| 75 in | 1,905 mm |
| 80 in | 2,032 mm |
| 90 in | 2,286 mm |
| 100 in | 2,540 mm |
| 150 in | 3,810 mm |
| 200 in | 5,080 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1,000 in | 25,400 mm |
| 5,000 in | 1,27,000 mm |
| 10,000 in | 2,54,000 mm |
What is an inch?
An inch is exactly 2.54 centimetres (since 1959). It is used for screen sizes, pipe and tyre sizes, and heights in feet and inches.
What is a millimetre?
A millimetre is one thousandth of a metre (0.001 m), used for precise measurements in engineering, construction drawings and rainfall.
Related conversions
Millimetres to inchesMillimetres to centimetresCentimetres to millimetresMillimetres to metresMetres to millimetresCentimetres to inchesInches to centimetresInches to feetFeet to inchesMetres to inchesInches to metresAll length units
Frequently asked questions
How do I convert inches to millimetres?
Multiply the value in inches by 25.4. 1 inch = 25.4 millimetres.
How many inches are in one millimetre?
1 millimetre = 0.0393700787 inches.
What is 2 in in mm?
2 in = 50.8 mm.
What is 10 in in mm?
10 in = 254 mm.