Unit converter
Inches to Millimeters Converter
Convert inches to millimeters exactly. One inch is defined as 25.4 mm, giving you the precise result needed for CAD, engineering drawings, and manufacturing tolerances.
Formula
mm = in × 25.4
Example: 2 in × 25.4 = 50.8 mm.
Inches to Millimeters conversion chart
| Inches (in) | Millimeters (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 |
| 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 |
Frequently asked questions
- How many millimeters are in an inch?
- Exactly 25.4 mm.
- How do I convert fractional inches to mm?
- Convert the fraction to a decimal first. Example: 3/8 in = 0.375 in × 25.4 = 9.525 mm.
- What is 1/2 inch in mm?
- 0.5 in × 25.4 = 12.7 mm.
Reverse
Millimeters → InchesRelated conversions