Convert Caliber to Mil
Convert calibers to mils instantly. 1 caliber = 10 mil — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Mil to Caliber converter for the reverse conversion.
Units explained
Caliber
In length-measurement context, a caliber is a unit equal to one hundredth of an inch (2.54×10⁻⁴ m). The same word also refers to a firearm's bore diameter; in that context the value depends on the specific cartridge.
The caliber as a length unit derives from the inch by hundredth subdivision. Standardised through the 1959 International Yard and Pound Agreement.
Calibers appear in ballistics literature (alongside the more common usage as bore diameter), historical small-arms specifications, and a few precision-engineering contexts. Often confused with the cartridge-naming caliber, which is a different concept.
Length-unit usage standardised through the 1959 International Yard and Pound Agreement; the bore-diameter usage long predates this.
Mil
A mil (also called a thou) is an Imperial unit of length equal to one thousandth of an inch (1/1000 in = 0.0254 mm = 25.4 μm exactly). It is used in engineering, manufacturing, and materials specifications.
The mil is derived from the Latin mille, "thousand," denoting one-thousandth of an inch. Standardized in industrial use during the 19th-century rise of precision engineering.
Mils are used to specify thicknesses of plastic films, foils, paper, copper traces on printed circuit boards (PCBs), wire insulation, and paint coatings. A standard sheet of paper is about 4 mils thick.
Adopted in 19th-century engineering practice; the value (1/1000 in) became exact in 1959 when the inch was fixed at 25.4 mm via the International Yard and Pound Agreement. The British term is "thou"; American term is "mil".
Caliber to Mil conversion formula
The relationship between calibers and mils:
To convert calibers to mils, multiply the value in calibers by 10. To reverse, multiply mils by 0.1.
How to use this converter
Type a value into the calculator. The result in mils updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Mil to Caliber converter for the reverse direction.
Step-by-step: convert calibers to mils
- Write down the value in calibers (cl).
- Multiply that value by the factor 10.
- The product is the equivalent value in mils (mil).
- To reverse, multiply the mil value by 0.1.
Worked examples
Example 1 — Convert 1 cl to mil:
1 × 10 = 10 mil
Example 2 — Convert 100 cl to mil:
100 × 10 = 1000 mil
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 calibers), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 cl × 10 = 30 mil
Real-world example — Plastic-film thickness alternates
A 150-caliber plastic film converts cleanly to mils — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 cl × 10 = 1500 mil
Real-world example — Hair-width scale measurements
A 70-caliber measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like mils for direct comparison across supplier datasheets.
70 cl × 10 = 700 mil
Caliber to Mil conversion table
Standard reference values for converting calibers to mils:
| Caliber [cl] | Mil [mil] |
|---|---|
| 0.01 | 0.1 |
| 0.1 | 1 |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 10 | 100 |
| 20 | 200 |
| 30 | 300 |
| 40 | 400 |
| 50 | 500 |
| 100 | 1000 |
| 500 | 5000 |
| 1000 | 10000 |
Frequently asked questions
How many mils is 1 caliber?
How do I convert calibers to mils?
How do I convert mils back to calibers?
How many mils is 100 calibers?
Popular length unit conversions
Convert Caliber to other length units
Show all Caliber conversions
Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 cl = 10 mil) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.