Convert Mil to Centiinch
Convert mils to centiinches instantly. 1 mil = 0.1 centiinch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Centiinch to Mil converter for the reverse conversion.
Units explained
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".
Centiinch
A centiinch is an Imperial unit of length equal to one hundredth of an inch (2.54×10⁻⁴ m). It is functionally identical to the caliber as a length unit but appears in different industrial contexts.
Derived from the inch via the metric-style prefix centi- (Latin centum, hundred). Standardised through the 1959 International Yard and Pound Agreement.
Centiinches occasionally appear in older engineering specifications and US-localised metric-pseudo notation. Most contemporary use prefers thousandths (mils) for sub-inch precision.
Standardised through the 1959 International Yard and Pound Agreement; rarely used in modern practice.
Mil to Centiinch conversion formula
The relationship between mils and centiinches:
To convert mils to centiinches, multiply the value in mils by 0.1. To reverse, multiply centiinches by 10.
How to use this converter
Type a value into the calculator. The result in centiinches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Centiinch to Mil converter for the reverse direction.
Step-by-step: convert mils to centiinches
- Write down the value in mils (mil).
- Multiply that value by the factor 0.1.
- The product is the equivalent value in centiinches (cin).
- To reverse, multiply the centiinch value by 10.
Worked examples
Example 1 — Convert 1 mil to cin:
1 × 0.1 = 0.1 cin
Example 2 — Convert 100 mil to cin:
100 × 0.1 = 10 cin
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 mils), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 mil × 0.1 = 0.3 cin
Real-world example — Plastic-film thickness alternates
A 150-mil plastic film converts cleanly to centiinches — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 mil × 0.1 = 15 cin
Real-world example — Hair-width scale measurements
A 70-mil measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like centiinches for direct comparison across supplier datasheets.
70 mil × 0.1 = 7 cin
Mil to Centiinch conversion table
Standard reference values for converting mils to centiinches:
| Mil [mil] | Centiinch [cin] |
|---|---|
| 0.01 | 0.001 |
| 0.1 | 0.01 |
| 1 | 0.1 |
| 2 | 0.2 |
| 3 | 0.3 |
| 4 | 0.4 |
| 5 | 0.5 |
| 10 | 1 |
| 20 | 2 |
| 30 | 3 |
| 40 | 4 |
| 50 | 5 |
| 100 | 10 |
| 500 | 50 |
| 1000 | 100 |
Frequently asked questions
How many centiinches is 1 mil?
How do I convert mils to centiinches?
How do I convert centiinches back to mils?
How many centiinches is 100 mils?
Popular length unit conversions
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Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 mil = 0.1 cin) 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.