Inches to Millimeters Converter
Type a value in inches to get millimeters. You can also type in the millimeters box to convert the other way.
in
mm
1 in = 25.4 mm
Convert mm to inchesHow to convert inches to millimeters
The formula:
mm = in × 25.4
Example: 1.5 in × 25.4 = 38.1 mm
Router bits and pipe threads are often sold in fractional inches: 1/4 inch is 6.35 mm and 1/2 inch is 12.7 mm.
Inches to Millimeters conversion chart
| Inches | Millimeters |
|---|---|
| 0.125 in | 3.175 mm |
| 0.25 in | 6.35 mm |
| 0.375 in | 9.525 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 |
| 12 in | 304.8 mm |
What is an inch?
Exactly 2.54 centimeters, fixed by international agreement in 1959. Pipe, bolt and screen sizes are given in inches.
What is a millimeter?
One thousandth of a meter. The standard unit on engineering drawings, CNC machines and sheet metal.
Frequently asked questions
What is 1 in in millimeters?
1 in is 25.4 mm.
How do I convert inches to millimeters?
Multiply the value in inches by 25.4. For example, 1.5 in × 25.4 = 38.1 mm.
What is 1.5 in in millimeters?
1.5 in is 38.1 mm.