Convert Mil to Ell
Convert mils to ells instantly. 1 mil = 2.222222e-5 ell — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Ell 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".
Ell
An ell is an Imperial unit of length equal to 45 inches (1.143 m), historically used as the standard measure of cloth in English commerce.
The ell derives from old English elna (forearm) and was standardised in medieval English trade as the cloth-measuring yard equivalent. The English ell is 45 inches; other regional ells differed.
Ells appear in historical English commerce records (especially cloth and tapestry trade). Used in legal documents through the 19th century; rare in modern commerce but referenced in literary and historical contexts.
Medieval English cloth-trade origin; standardised at 45 inches; became exact via the 1959 International Yard and Pound Agreement.
Mil to Ell conversion formula
The relationship between mils and ells:
To convert mils to ells, multiply the value in mils by 2.222222e-5. To reverse, multiply ells by 45000.
How to use this converter
Type a value into the calculator. The result in ells updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Ell to Mil converter for the reverse direction.
Step-by-step: convert mils to ells
- Write down the value in mils (mil).
- Multiply that value by the factor 2.222222e-5.
- The product is the equivalent value in ells (ell).
- To reverse, multiply the ell value by 45000.
Worked examples
Example 1 — Convert 1 mil to ell:
1 × 2.222222e-5 = 2.222222e-5 ell
Example 2 — Convert 100 mil to ell:
100 × 2.222222e-5 = 0.0022222222 ell
Real-world example — Macro-scale buildup
A million mils equals exactly one ell — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.
1000000 mil × 2.222222e-5 = 22.2222222222 ell
Real-world example — Quarter-meter measurement reference
A 250,000-mil length equals 0.25 ells — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.
250000 mil × 2.222222e-5 = 5.5555555556 ell
Real-world example — From microscopic to macroscopic
A million mils equals exactly one ell. This kind of conversion appears in microfluidics, where total channel length is given in ells but feature widths are in mils.
1000000 mil × 2.222222e-5 = 22.2222222222 ell
Mil to Ell conversion table
Standard reference values for converting mils to ells:
| Mil [mil] | Ell [ell] |
|---|---|
| 0.01 | 2.222222e-7 |
| 0.1 | 2.222222e-6 |
| 1 | 2.222222e-5 |
| 2 | 4.444444e-5 |
| 3 | 6.666667e-5 |
| 4 | 8.888889e-5 |
| 5 | 0.0001111111 |
| 10 | 0.0002222222 |
| 20 | 0.0004444444 |
| 30 | 0.0006666667 |
| 40 | 0.0008888889 |
| 50 | 0.0011111111 |
| 100 | 0.0022222222 |
| 500 | 0.0111111111 |
| 1000 | 0.0222222222 |
Frequently asked questions
How many ells is 1 mil?
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Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 mil = 2.222222e-5 ell) 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.