Convert Furlong to Rod
Convert furlongs to rods instantly. 1 furlong = 40 rod — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Rod to Furlong converter for the reverse conversion.
Units explained
Furlong
A furlong is an Imperial unit of length equal to 660 feet, or exactly one eighth of a mile (about 201.17 m). It is the longest unit in the traditional English farm-and-survey system.
The furlong derives from Old English furh (furrow) + lang (long) — originally the length of a furrow in a typical medieval English open field. Standardised at 660 feet (= 10 chains = 220 yards = 1/8 mile) in medieval times.
Furlongs are the standard distance unit in horse racing (e.g., 'The race is 8 furlongs'), historical English farming and surveying, and occasional poetic or rhetorical usage. Modern racing courses worldwide list distances in furlongs.
Medieval English farming origin; standardised at 660 feet; remains the official distance unit in flat-racing thoroughbred horse races worldwide.
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.
Furlong to Rod conversion formula
The relationship between furlongs and rods:
To convert furlongs to rods, multiply the value in furlongs by 40. To reverse, multiply rods by 0.025.
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 Furlong converter for the reverse direction.
Step-by-step: convert furlongs to rods
- Write down the value in furlongs (fur).
- Multiply that value by the factor 40.
- The product is the equivalent value in rods (rd).
- To reverse, multiply the rod value by 0.025.
Worked examples
Example 1 — Convert 1 fur to rd:
1 × 40 = 40 rd
Example 2 — Convert 100 fur to rd:
100 × 40 = 4000 rd
Furlong to Rod conversion table
Standard reference values for converting furlongs to rods:
| Furlong [fur] | Rod [rd] |
|---|---|
| 0.01 | 0.4 |
| 0.1 | 4 |
| 1 | 40 |
| 2 | 80 |
| 3 | 120 |
| 4 | 160 |
| 5 | 200 |
| 10 | 400 |
| 20 | 800 |
| 30 | 1200 |
| 40 | 1600 |
| 50 | 2000 |
| 100 | 4000 |
| 500 | 20000 |
| 1000 | 40000 |
Frequently asked questions
How many rods is 1 furlong?
How do I convert furlongs to rods?
How do I convert rods back to furlongs?
How many rods is 100 furlongs?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 fur = 40 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.