inch to millimetre
Live inch (in) to millimetre (mm) converter. Plus a 10-value reference table and FAQs.
Conversion table
Ten sample values from inch to millimetre. Use the converter above for arbitrary values.
| inch (in) | → | millimetre (mm) |
|---|---|---|
| 0.001 in | → | 0.0254 mm |
| 0.01 in | → | 0.254 mm |
| 0.1 in | → | 2.54 mm |
| 0.5 in | → | 12.7 mm |
| 1 in | → | 25.4 mm |
| 2 in | → | 50.8 mm |
| 5 in | → | 127 mm |
| 10 in | → | 254 mm |
| 100 in | → | 2,540 mm |
| 1,000 in | → | 25,400 mm |
About the inch
1/12 of a foot or 25.4 mm. Screen sizes, paper, US fastener sizes.
About the millimetre
1/1000 of a metre. Standard for small machined parts and rainfall.
Frequently asked questions
Frequently Asked Questions
How do I convert inch to millimetre?
Multiply the inch value by 25.4 to get it in millimetre. For example, 10 in = 254 mm.
What is 1 in in mm?
1 in = 25.4 mm.
What is 100 in in mm?
100 in = 2,540 mm.
What is the formula?
Linear: multiply by 25.4 (the unit factor ratio).
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