Inch to Mm Converter
To convert inches to millimeters, multiply the length value by 25.4.
Interactive inch ↔ mm Converter
Formula: mm = in × 25.4 · in = mm ÷ 25.4
Quick Conversion Formula
millimeters = inches × 25.4
Common Inch to Mm Conversions
| Inches (in) | Millimeters (mm) |
|---|---|
| 1/16 | 1.5875 |
| 1/8 | 3.175 |
| 1/4 | 6.35 |
| 1/2 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
Real-World Examples
- 1/2 inch is 12.7 mm (common for bolts and tools).
- 1 inch equals 25.4 mm (standard conversion reference).
- 3 mm is about 0.118 inches (common material thickness).
Common Mistakes
A common mistake is confusing cm with mm. Remember: 1 inch = 2.54 cm = 25.4 mm.
FAQ
Why is 25.4 used? 25.4 mm per inch is the internationally agreed conversion factor.
Is 1 mm equal to 1 inch? No. 1 inch equals 25.4 mm.
How many mm are in 1/8 inch? 1/8 inch is 3.175 mm.