📏 Length
thou (mil) to mm Converter
Convert thou (mil) to mm instantly with a reference conversion table.
Quick answer: To convert thou (mil) to mm, multiply by 0.0254. For example, 1 thou (mil) = 0.0254 mm. Use the calculator below for any value.
thou (mil) to mm
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Common conversions
| thou (mil) | mm |
|---|
Formula:
How to convert thou (mil) to mm
1
Enter your value
Type the number of thou (mil) you want to convert into the left box. The result in mm appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — mm to thou (mil). Your current value carries across so you don't have to re-enter anything.
3
About thou (mil) and mm
thou (mil) and mm are common length measurements.
📊 Common conversions at a glance
| thou (mil) | mm |
|---|---|
| 1 | 0.0254 |
| 2 | 0.0508 |
| 4 | 0.1016 |
| 5 | 0.127 |
| 10 | 0.254 |
| 20 | 0.508 |
Reviewed for 2026. thou (mil) ↔ mm conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.
Frequently asked questions
How do I convert thou (mil) to mm?
To convert thou (mil) to mm, multiply by 0.0254. Or use the calculator above for instant results.
How many mm are in 1 thou (mil)?
1 thou (mil) equals 0.0254 mm.
Is the thou (mil) to mm converter free?
Yes, the thou (mil) to mm converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.