Inches to MM Converter
Convert inches to millimeters instantly with our free online inches to mm converter. Enter any length in inches and see the exact equivalent in millimeters immediately.
How to Use This Inch to Millimeter Converter
- 1Enter the length in inches (in) in the input field above.
- 2The converter automatically calculates the exact length in millimeters (mm).
- 3Use the swap button to switch between inches to mm and mm to inches conversion.
- 4Check the common conversions table for fractional inch measurements.
Inch to Millimeter Formula
To convert inches to millimeters, multiply the length in inches by 25.4. The formula is: millimeters = inches × 25.4. This exact conversion factor was established in 1959, defining the inch as precisely 25.4 millimeters.
For example, to convert 2 inches to mm: 2 × 25.4 = 50.8 mm. To convert 0.5 inches to mm: 0.5 × 25.4 = 12.7 mm.
Common Inches to Millimeters Conversions
| Inch (in) | Millimeter (mm) |
|---|---|
| 0.125 | 3.17 |
| 0.25 | 6.35 |
| 0.5 | 12.7 |
| 0.75 | 19.05 |
| 1 | 25.4 |
| 1.5 | 38.1 |
| 2 | 50.8 |
| 3 | 76.2 |
| 4 | 101.6 |
| 5 | 127 |
| 6 | 152.4 |
| 8 | 203.2 |
| 10 | 254 |
| 12 | 304.8 |
| 16 | 406.4 |
| 20 | 508 |
| 24 | 609.6 |
| 36 | 914.4 |
| 48 | 1,219.2 |
| 60 | 1,524 |
About Inches and Millimeters
The inch is a unit of length equal to exactly 25.4 millimeters. It remains the standard unit of measurement in the United States for construction materials, screen sizes, and countless everyday items. Millimeters are used in the metric system for precision engineering, 3D printing, and scientific applications. Converting inches to millimeters is necessary when working with metric specifications, ordering components from international suppliers, setting up 3D printer settings, or collaborating on projects that use mixed measurement systems. Our converter handles both whole numbers and fractional inch values with precision.