QConvert
Inch to Millimeter Converter
Convert Inch to Millimeter instantly — live results with exact conversion factors.
Answer
1 inch = 25.4 millimeters. To convert in to mm, multiply by 25.4.
Quick Reference Table
| Inch (in) | Millimeter (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 50 | 1270 |
| 100 | 2540 |
| 250 | 6350 |
| 500 | 12700 |
| 1000 | 25400 |
Formula
Convert Inch (in) to Millimeter (mm) using the relationship:
mm = in × 25.4
How to Convert
- Take the value in inches (in).
- Multiply it by 25.4 (the conversion factor from in to mm).
- The result is the equivalent value in millimeters (mm).
- Example: 1 in = 25.4 mm.
Reverse Conversion
Need it the other direction? Millimeter to Inch conversion.
All Length Conversions
See the full list of Length conversions.
Related Conversions
FAQ
▸ How many millimeters are in 1 inch?
1 Inch equals 25.4 millimeters. Multiply by 25.4 to convert in to mm.
▸ What is the formula to convert inch to millimeter?
Multiply the value in inches by 25.4 to get millimeters. Formula: mm = in × 25.4.
▸ How do I convert inches to millimeters easily?
Enter your value in the converter at the top of this page — the millimeters result updates live as you type. You can also multiply by 25.4 directly.