Convert Mils to Inches
1 mil equals 0.001 inches (in).
1 mil = 0.001 in
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk mil to inch converter to paste a column from Excel.
How to Convert Mil to Inch
- 1 mil = 0.001 in
- 1 in = 1000 mil
- Example: convert 15 mil to in: 15 mil = 15 × 0.001 in = 0.015 in
Reference conditions. in: The international yard and pound agreement (1959) fixed 1 yard = 0.9144 m exactly, so the inch, foot and mile are exact.
Formula
in = mil ÷ 1000
Derivation from SI units:
- 1 mil = 0.001 in = 25.4 µm (exact)
- 1 in = 2.54 cm = 0.0254 m (exact)
- 1 mil = 0.0000254 m ÷ 0.0254 m per in = 0.001 in
Both units are defined exactly, so the factor is exact. Mil definition: mil; Inch definition: inch.
Worked examples
- A reading of 4 mil converts to 0.004 in.
4 mil × 0.001 = 0.004 in - A value of 15 mil is 0.015 in.
15 mil × 0.001 = 0.015 in
Mil to Inch conversion table
| Mils (mil) | Inches (in) |
|---|---|
| 0.5 mil | 0.0005 in |
| 1 mil | 0.001 in |
| 1.5 mil | 0.0015 in |
| 2 mil | 0.002 in |
| 3 mil | 0.003 in |
| 4 mil | 0.004 in |
| 5 mil | 0.005 in |
| 6 mil | 0.006 in |
| 8 mil | 0.008 in |
| 10 mil | 0.01 in |
| 15 mil | 0.015 in |
| 20 mil | 0.02 in |
| 40 mil | 0.04 in |
| 50 mil | 0.05 in |
| 100 mil | 0.1 in |
Where it's used
Mils are used for plastic film and bag thickness, while inches appear in screen and TV sizes (diagonal). Both measure length and distance, so the conversion is a fixed factor.
Mil to other length units
| Conversion | 1 mil equals |
|---|---|
| mil to meter | 0.0000254 m |
| mil to kilometer | 2.54 × 10⁻⁸ km |
| mil to centimeter | 0.00254 cm |
| mil to millimeter | 0.0254 mm |
| mil to micrometer | 25.4 µm |
| mil to nanometer | 25400 nm |
| mil to angstrom | 254000 Å |
| mil to mile | 1.578282828 × 10⁻⁸ mi |
| mil to yard | 0.00002777777778 yd |
| mil to foot | 0.00008333333333 ft |
| mil to inch | 0.001 in |
| mil to nautical mile | 1.371490281 × 10⁻⁸ nmi |
Frequently asked questions
How many inches are in 1 mil?
1 mil = 0.001 in.
How do I convert mils to inches?
Multiply the value in mil by 0.001, or divide it by 1000. For example, 15 mil × 0.001 = 0.015 in.
Is the mil to in conversion exact?
Yes. Both units are defined exactly, and 1 mil is exactly 0.001 in.
Sources
- 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)".
- 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, "inch (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 Mils to Inches. Retrieved October 17, 2026, from https://scientificconverters.com/length/mils-to-inches/
IEEE
Scientific Converters, "Convert Mils to Inches," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/mils-to-inches/