Convert Rod to Mil
Convert rods to mils instantly. 1 rod = 198000 mil — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Mil to Rod converter for the reverse conversion.
Units explained
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
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 to Mil conversion formula
The relationship between rods and mils:
To convert rods to mils, multiply the value in rods by 198000. To reverse, multiply mils by 5.050505e-6.
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 Rod converter for the reverse direction.
Step-by-step: convert rods to mils
- Write down the value in rods (rd).
- Multiply that value by the factor 198000.
- The product is the equivalent value in mils (mil).
- To reverse, multiply the mil value by 5.050505e-6.
Worked examples
Example 1 — Convert 1 rd to mil:
1 × 198000 = 198000 mil
Example 2 — Convert 100 rd to mil:
100 × 198000 = 1.98e+7 mil
Real-world example — Sub-meter precision
A 0.001-rod (1 mm) tolerance equals 1,000 mils — useful for surface-finish specs, where macro-scale dimensions are given in the larger unit but feature roughness in the smaller.
0.001 rd × 198000 = 198 mil
Real-world example — Macro-to-micro scale comparison
2 rods of measurement converts to a very large number in mils — useful in materials science when comparing bulk-sample dimensions to feature-level surface specs.
2 rd × 198000 = 396000 mil
Real-world example — Macroscopic to microscopic
One rod equals a million mils. Optical engineers calculating coherence length compare macro-scale path lengths with micro-scale wavelength differences using exactly this conversion.
1 rd × 198000 = 198000 mil
Rod to Mil conversion table
Standard reference values for converting rods to mils:
| Rod [rd] | Mil [mil] |
|---|---|
| 0.01 | 1980 |
| 0.1 | 19800 |
| 1 | 198000 |
| 2 | 396000 |
| 3 | 594000 |
| 4 | 792000 |
| 5 | 990000 |
| 10 | 1980000 |
| 20 | 3960000 |
| 30 | 5940000 |
| 40 | 7920000 |
| 50 | 9900000 |
| 100 | 1.98e+7 |
| 500 | 9.9e+7 |
| 1000 | 1.98e+8 |
Frequently asked questions
How many mils is 1 rod?
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Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 rd = 198000 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.