Convert Inches to Mils
1 inch (in) equals 1000 mils (mil).
1 in = 1000 mil
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk inch to mil converter to paste a column from Excel.
How to Convert Inch to Mil
- 1 in = 1000 mil
- 1 mil = 0.001 in
- Example: convert 15 in to mil: 15 in = 15 × 1000 mil = 15000 mil
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
mil = in × 1000
Derivation from SI units:
- 1 in = 2.54 cm = 0.0254 m (exact)
- 1 mil = 0.001 in = 25.4 µm (exact)
- 1 in = 0.0254 m ÷ 0.0000254 m per mil = 1000 mil
Both units are defined exactly, so the factor is exact. Inch definition: inch; Mil definition: mil.
Worked examples
- A reading of 4 in converts to 4000 mil.
4 in × 1000 = 4000 mil - A value of 24 in is 24000 mil.
24 in × 1000 = 24000 mil
Inch to Mil conversion table
| Inches (in) | Mils (mil) |
|---|---|
| 0.125 in | 125 mil |
| 0.25 in | 250 mil |
| 0.5 in | 500 mil |
| 0.75 in | 750 mil |
| 1 in | 1000 mil |
| 1.5 in | 1500 mil |
| 2 in | 2000 mil |
| 3 in | 3000 mil |
| 4 in | 4000 mil |
| 5 in | 5000 mil |
| 6 in | 6000 mil |
| 8 in | 8000 mil |
| 10 in | 10000 mil |
| 12 in | 12000 mil |
| 15 in | 15000 mil |
| 20 in | 20000 mil |
| 24 in | 24000 mil |
| 27 in | 27000 mil |
| 32 in | 32000 mil |
| 36 in | 36000 mil |
| 48 in | 48000 mil |
| 55 in | 55000 mil |
| 65 in | 65000 mil |
| 72 in | 72000 mil |
Where it's used
Inches are used for screen and TV sizes (diagonal), while mils appear in plastic film and bag thickness. Both measure length and distance, so the conversion is a fixed factor.
Inch to other length units
| Conversion | 1 in equals |
|---|---|
| inch to meter | 0.0254 m |
| inch to kilometer | 0.0000254 km |
| inch to centimeter | 2.54 cm |
| inch to millimeter | 25.4 mm |
| inch to micrometer | 25400 µm |
| inch to nanometer | 25400000 nm |
| inch to angstrom | 254000000 Å |
| inch to mile | 0.00001578282828 mi |
| inch to yard | 0.02777777778 yd |
| inch to foot | 0.08333333333 ft |
| inch to mil | 1000 mil |
| inch to nautical mile | 0.00001371490281 nmi |
Frequently asked questions
How many mils are in 1 inch?
1 in = 1000 mil.
How do I convert inches to mils?
Multiply the value in in by 1000. For example, 15 in × 1000 = 15000 mil.
Is the in to mil conversion exact?
Yes. Both units are defined exactly, and 1 in is exactly 1000 mil.
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, "inch (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, "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 Inches to Mils. Retrieved October 17, 2026, from https://scientificconverters.com/length/inches-to-mils/
IEEE
Scientific Converters, "Convert Inches to Mils," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/inches-to-mils/