Length conversion
Inch to Millimeter
1 in =25.4mm
25.4
1 in =25.4 mm
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About Inch to Millimeter
Convert inch (in) to millimeter (mm) instantly. This page explains the formula, gives common reference values, and provides a quick-lookup table for the most-searched conversions.
Formula
Millimeter = Inch × 25.4.
Worked example
For example, 10 in × 25.4 = 254.0000 mm.
Inch to Millimeter table
| Inch (in) | Millimeter (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1,270 |
| 100 | 2,540 |
| 250 | 6,350 |
| 500 | 12,700 |
| 1,000 | 25,400 |
Common use cases
- 01Converting length between metric and imperial systems
- 02Engineering, science, and education
- 03Travel, shopping, and everyday calculations
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Frequently asked questions
How do I convert Inch to Millimeter?+
Multiply the value in inch by 25.4.
What is 1 in in mm?+
1 in = 25.4 mm.
Need the reverse?
Convert Millimeter to Inch →