Convert Millimeters to Mils
1 millimeter (mm) equals 39.37007874 mils (mil).
1 mm = 39.37007874 mil
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimeter to mil converter to paste a column from Excel.
How to Convert Millimeter to Mil
- 1 mm = 39.37007874 mil
- 1 mil = 0.0254 mm
- Example: convert 15 mm to mil: 15 mm = 15 × 39.37007874 mil = 590.5511811 mil
Formula
mil = mm × 39.37007874016
Derivation from SI units:
- 1 mm = 10⁻³ m
- 1 mil = 0.001 in = 25.4 µm (exact)
- 1 mm = 0.001 m ÷ 0.0000254 m per mil = 39.37007874016 mil
Both units are defined exactly, so the factor is exact. Millimeter definition: millimeter; Mil definition: mil.
Worked examples
- A 0.1 mm film is 3.937007874 mil thick.
0.1 mm × 39.37007874 = 3.937007874 mil - 1 mm is 39.37007874 mil.
1 mm × 39.37007874 = 39.37007874 mil
Millimeter to Mil conversion table
| Millimeters (mm) | Mils (mil) |
|---|---|
| 0.1 mm | 3.937007874 mil |
| 0.5 mm | 19.68503937 mil |
| 1 mm | 39.37007874 mil |
| 2 mm | 78.74015748 mil |
| 3 mm | 118.1102362 mil |
| 5 mm | 196.8503937 mil |
| 6 mm | 236.2204724 mil |
| 8 mm | 314.9606299 mil |
| 10 mm | 393.7007874 mil |
| 12 mm | 472.4409449 mil |
| 15 mm | 590.5511811 mil |
| 16 mm | 629.9212598 mil |
| 20 mm | 787.4015748 mil |
| 25 mm | 984.2519685 mil |
| 25.4 mm | 1000 mil |
| 30 mm | 1181.102362 mil |
| 50 mm | 1968.503937 mil |
| 75 mm | 2952.755906 mil |
| 100 mm | 3937.007874 mil |
| 150 mm | 5905.511811 mil |
| 300 mm | 11811.02362 mil |
| 500 mm | 19685.03937 mil |
| 1000 mm | 39370.07874 mil |
Where it's used
Metric thicknesses are converted to mils for US packaging, coating and PCB specifications. Divide by 0.0254.
Millimeter to other length units
| Conversion | 1 mm equals |
|---|---|
| millimeter to meter | 0.001 m |
| millimeter to kilometer | 0.000001 km |
| millimeter to centimeter | 0.1 cm |
| millimeter to micrometer | 1000 µm |
| millimeter to nanometer | 1000000 nm |
| millimeter to angstrom | 10000000 Å |
| millimeter to mile | 6.213711922 × 10⁻⁷ mi |
| millimeter to yard | 0.001093613298 yd |
| millimeter to foot | 0.003280839895 ft |
| millimeter to inch | 0.03937007874 in |
| millimeter to mil | 39.37007874 mil |
| millimeter to nautical mile | 5.399568035 × 10⁻⁷ nmi |
Frequently asked questions
How many mils is 1 mm?
1 mm = 39.3701 mil.
How many mils are in 1 millimeter?
1 mm = 39.37007874 mil.
How do I convert millimeters to mils?
Multiply the value in mm by 39.37007874. For example, 15 mm × 39.37007874 = 590.5511811 mil.
Is the mm to mil conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "mil (0.001 in)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Millimeters to Mils. Retrieved October 17, 2026, from https://scientificconverters.com/length/millimeters-to-mils/
IEEE
Scientific Converters, "Convert Millimeters to Mils," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/millimeters-to-mils/