Inch → Millimeter
1 in = 25.4 mm. Convert inches to millimeters instantly with this free online tool.
1 in = 25.4 mm
Inch to Millimeter Conversion Table
| Inch (in) | Millimeter (mm) |
|---|---|
| 1 | 25.4 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
| 500 | 12,700 |
| 1000 | 25,400 |
Inch to Millimeter Formula
1 in = 25.4 mm
Nominal vs Actual Lumber Sizes
| Nominal | Actual (in) | Actual (mm) |
|---|---|---|
| 1×2 | 3/4" × 1-1/2" | 19 × 38 |
| 1×4 | 3/4" × 3-1/2" | 19 × 89 |
| 1×6 | 3/4" × 5-1/2" | 19 × 140 |
| 2×2 | 1-1/2" × 1-1/2" | 38 × 38 |
| 2×4 | 1-1/2" × 3-1/2" | 38 × 89 |
| 2×6 | 1-1/2" × 5-1/2" | 38 × 140 |
| 2×8 | 1-1/2" × 7-1/4" | 38 × 184 |
| 2×10 | 1-1/2" × 9-1/4" | 38 × 235 |
| 2×12 | 1-1/2" × 11-1/4" | 38 × 286 |
| 4×4 | 3-1/2" × 3-1/2" | 89 × 89 |
| 6×6 | 5-1/2" × 5-1/2" | 140 × 140 |
About Inch and Millimeter
What is a Inch?
An inch is 1/12 of a foot and exactly 25.4 millimeters, widely used in the United States and United Kingdom for everyday measurements. The width of an adult thumb is approximately 1 inch.
What is a Millimeter?
A millimeter is one thousandth of a meter (0.001 m), the base unit of length in the metric system. A credit card is about 0.76 mm thick.
When to convert Inch to Millimeter
Converting inches to millimeters is common when working with imperial measurements alongside metric specifications. For example, specifying lumber dimensions like 2×4 boards. Use millimeters for precision measurements under 1 cm, especially in hardware, engineering drawings, and tile work.
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