Convert League to Fathom
Convert leagues to fathoms instantly. 1 league = 2640 fathom — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Fathom to League converter for the reverse conversion.
Units explained
League
A league is an Imperial unit of length equal to 3 miles (about 4.83 km). It is one of the oldest distance units in English usage, historically representing the distance a person could walk in one hour.
The English league derives from the ancient Roman leuga via medieval English customary practice. Standardised at 3 statute miles in English law.
Leagues appear in historical English literature ('seven-league boots'), maritime navigation (a nautical league is 3 nautical miles), and traditional distance descriptions. Modern usage is largely literary.
Medieval English customary origin; standardised at 3 miles; became exact via the 1959 International Yard and Pound Agreement.
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.
League to Fathom conversion formula
The relationship between leagues and fathoms:
To convert leagues to fathoms, multiply the value in leagues by 2640. To reverse, multiply fathoms by 0.0003787879.
How to use this converter
Type a value into the calculator. The result in fathoms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Fathom to League converter for the reverse direction.
Step-by-step: convert leagues to fathoms
- Write down the value in leagues (lea).
- Multiply that value by the factor 2640.
- The product is the equivalent value in fathoms (ftm).
- To reverse, multiply the fathom value by 0.0003787879.
Worked examples
Example 1 — Convert 1 lea to ftm:
1 × 2640 = 2640 ftm
Example 2 — Convert 100 lea to ftm:
100 × 2640 = 264000 ftm
Real-world example — Track athletics distances
A 1-league running track equals one thousand fathoms. Track athletes' lap pacing converts the lap (often 400 of the smaller unit) into the fractional race distance whenever a coach reviews splits.
1 lea × 2640 = 2640 ftm
Real-world example — Geographic to human-scale conversion
One league converts to a precise number of fathoms — the everyday arithmetic for navigation systems, race-distance calculations, and any context where bigger geographic units must be related to the smaller working units.
1 lea × 2640 = 2640 ftm
Real-world example — Lap pacing and route segmentation
Translating a league-scale distance into fathoms is how runners, cyclists, and route planners convert top-line totals into the working segments they actually pace and execute.
1 lea × 2640 = 2640 ftm
League to Fathom conversion table
Standard reference values for converting leagues to fathoms:
| League [lea] | Fathom [ftm] |
|---|---|
| 0.01 | 26.4 |
| 0.1 | 264 |
| 1 | 2640 |
| 2 | 5280 |
| 3 | 7920 |
| 4 | 10560 |
| 5 | 13200 |
| 10 | 26400 |
| 20 | 52800 |
| 30 | 79200 |
| 40 | 105600 |
| 50 | 132000 |
| 100 | 264000 |
| 500 | 1320000 |
| 1000 | 2640000 |
Frequently asked questions
How many fathoms is 1 league?
How do I convert leagues to fathoms?
How do I convert fathoms back to leagues?
How many fathoms is 100 leagues?
Popular length unit conversions
Convert League to other length units
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 lea = 2640 ftm) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.