Convert Fathom to Furlong
Convert fathoms to furlongs instantly. 1 fathom = 0.0090909091 furlong — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Furlong to Fathom converter for the reverse conversion.
Units explained
Fathom
A fathom is an Imperial unit of length equal to 6 feet or exactly 1.8288 meters. It is used almost exclusively for measuring water depth in maritime contexts.
The fathom derives from the Old English word fæthm, meaning "the embracing arms" — the distance between the fingertips of a person's outstretched arms. Standardized at 6 feet in English maritime tradition.
Fathoms are used in nautical depth charts, scuba diving, oceanography, and maritime literature. Despite metrication efforts, fathoms remain common in English-language nautical charts and recreational diving.
Old English origin (predating 1066); standardized at 6 feet by English maritime tradition; fixed at 1.8288 m exactly via the 1959 International Yard and Pound Agreement.
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.
Fathom to Furlong conversion formula
The relationship between fathoms and furlongs:
To convert fathoms to furlongs, multiply the value in fathoms by 0.0090909091. To reverse, multiply furlongs by 110.
How to use this converter
Type a value into the calculator. The result in furlongs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Furlong to Fathom converter for the reverse direction.
Step-by-step: convert fathoms to furlongs
- Write down the value in fathoms (ftm).
- Multiply that value by the factor 0.0090909091.
- The product is the equivalent value in furlongs (fur).
- To reverse, multiply the furlong value by 110.
Worked examples
Example 1 — Convert 1 ftm to fur:
1 × 0.0090909091 = 0.0090909091 fur
Example 2 — Convert 100 ftm to fur:
100 × 0.0090909091 = 0.9090909091 fur
Real-world example — Fabric purchase length
Two fathoms of fabric equals a value in furlongs essential for tailors and textile buyers sourcing material from international suppliers that quote in different units.
2 ftm × 0.0090909091 = 0.0181818182 fur
Real-world example — Maritime depth conversion
A 10-fathom sounding depth converts cleanly into furlongs. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 ftm × 0.0090909091 = 0.0909090909 fur
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 ftm × 0.0090909091 = 0.0090909091 fur
Fathom to Furlong conversion table
Standard reference values for converting fathoms to furlongs:
| Fathom [ftm] | Furlong [fur] |
|---|---|
| 0.01 | 9.090909e-5 |
| 0.1 | 0.0009090909 |
| 1 | 0.0090909091 |
| 2 | 0.0181818182 |
| 3 | 0.0272727273 |
| 4 | 0.0363636364 |
| 5 | 0.0454545455 |
| 10 | 0.0909090909 |
| 20 | 0.1818181818 |
| 30 | 0.2727272727 |
| 40 | 0.3636363636 |
| 50 | 0.4545454545 |
| 100 | 0.9090909091 |
| 500 | 4.5454545455 |
| 1000 | 9.0909090909 |
Frequently asked questions
How many furlongs is 1 fathom?
How do I convert fathoms to furlongs?
How do I convert furlongs back to fathoms?
How many furlongs is 100 fathoms?
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 ftm = 0.0090909091 fur) 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.