📏 Length
mm to thou (mil) Converter
Convert mm to thou (mil) instantly with a reference conversion table.
Quick answer: To convert mm to thou (mil), multiply by 39.3701. For example, 1 mm = 39.3701 thou (mil). Use the calculator below for any value.
mm to thou (mil)
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Common conversions
| mm | thou (mil) |
|---|
Formula:
How to convert mm to thou (mil)
1
Enter your value
Type the number of mm you want to convert into the left box. The result in thou (mil) 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 — thou (mil) to mm. Your current value carries across so you don't have to re-enter anything.
3
About mm and thou (mil)
mm and thou (mil) are common length measurements.
📊 Common conversions at a glance
| mm | thou (mil) |
|---|---|
| 0.001 | 0.03937 |
| 0.01 | 0.3937 |
| 0.025 | 0.9843 |
| 0.05 | 1.969 |
| 0.1 | 3.937 |
| 0.5 | 19.69 |
Reviewed for 2026. mm ↔ thou (mil) 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 mm to thou (mil)?
To convert mm to thou (mil), multiply by 39.3701. Or use the calculator above for instant results.
How many thou (mil) are in 1 mm?
1 mm equals 39.3701 thou (mil).
Is the mm to thou (mil) converter free?
Yes, the mm to thou (mil) converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.