Convert Mil to Rod
Convert mils to rods instantly. 1 mil = 5.050505e-6 rod — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Rod 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".
Rod
A rod is an Imperial unit of length equal to 16.5 feet (about 5.03 m). It is also called a perch or pole. Used historically in English and American land surveying.
The rod derives from medieval English land-surveying practice. Standardised at 16.5 feet (= 25 links of a surveyor's chain = 1/4 chain) by Edmund Gunter in 1620.
Rods are the standard unit in legacy US public-land-survey records, where lot dimensions are typically expressed in rods and chains. Modern surveyors generally use feet or meters but legacy deeds remain in rods.
Defined by Edmund Gunter in 1620 as 16.5 feet via the chain-based survey system; became exact via the 1959 International Yard and Pound Agreement.
Mil to Rod conversion formula
The relationship between mils and rods:
To convert mils to rods, multiply the value in mils by 5.050505e-6. To reverse, multiply rods by 198000.
How to use this converter
Type a value into the calculator. The result in rods updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Rod to Mil converter for the reverse direction.
Step-by-step: convert mils to rods
- Write down the value in mils (mil).
- Multiply that value by the factor 5.050505e-6.
- The product is the equivalent value in rods (rd).
- To reverse, multiply the rod value by 198000.
Worked examples
Example 1 — Convert 1 mil to rd:
1 × 5.050505e-6 = 5.050505e-6 rd
Example 2 — Convert 100 mil to rd:
100 × 5.050505e-6 = 0.0005050505 rd
Real-world example — Quarter-meter measurement reference
A 250,000-mil length equals 0.25 rods — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.
250000 mil × 5.050505e-6 = 1.2626262626 rd
Real-world example — From microscopic to macroscopic
A million mils equals exactly one rod. This kind of conversion appears in microfluidics, where total channel length is given in rods but feature widths are in mils.
1000000 mil × 5.050505e-6 = 5.0505050505 rd
Real-world example — Macro-scale buildup
A million mils equals exactly one rod — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.
1000000 mil × 5.050505e-6 = 5.0505050505 rd
Mil to Rod conversion table
Standard reference values for converting mils to rods:
| Mil [mil] | Rod [rd] |
|---|---|
| 0.01 | 5.050505e-8 |
| 0.1 | 5.050505e-7 |
| 1 | 5.050505e-6 |
| 2 | 1.010101e-5 |
| 3 | 1.515152e-5 |
| 4 | 2.020202e-5 |
| 5 | 2.525253e-5 |
| 10 | 5.050505e-5 |
| 20 | 0.0001010101 |
| 30 | 0.0001515152 |
| 40 | 0.0002020202 |
| 50 | 0.0002525253 |
| 100 | 0.0005050505 |
| 500 | 0.0025252525 |
| 1000 | 0.0050505051 |
Frequently asked questions
How many rods 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 = 5.050505e-6 rd) 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.