A league is commonly treated as three statute miles.
Leagues to Fathoms Converter — lea to ftm
Convert League (lea) to Fathom (ftm) using the exact conversion factor (1 league = 2,640 fathom). See the formula, worked examples, and conversion table.
Leagues to Fathoms converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
A fathom is six feet.
Result = input x 4828.032 / 1.8288.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Leagues to Fathoms
League and Fathom both measure length. Specifically: A league is commonly treated as three statute miles, and a fathom is six feet.
Formula
fathoms = leagues × 2640
This factor comes from each unit's defined relationship to the category's base unit: 1 league equals 4828.032 base units, and 1 fathom equals 1.8288 base units, so dividing one by the other gives the direct league-to-fathom factor of 2640.
Simple example
1 lea × 2640 = 2,640 ftm
1 league = 2,640 fathoms.
Real-world example
10 lea × 2640 = 26,400 ftm
10 leagues = 26,400 fathoms.
Conversion table
| League (lea) | Fathom (ftm) |
|---|---|
| 1 lea | 2,640 ftm |
| 5 lea | 13,200 ftm |
| 10 lea | 26,400 ftm |
| 21.0975 lea | 55,697.4 ftm |
| 42.195 lea | 111,394.8 ftm |
| 100 lea | 264,000 ftm |
Reverse conversion: Fathom to League
1 ftm × 0.0003787878788 = 0.0003787879 lea
1 fathom = 0.0003787879 leagues.
leagues = fathoms × 0.000378787878788
For a page dedicated to this direction, see Fathom to League.
Understanding the League (lea)
A league is commonly treated as three statute miles.
Understanding the Fathom (ftm)
A fathom is six feet.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many fathoms are in 1 league?
1 league equals 2,640 fathoms, using the exact defined conversion factor rather than an estimate.
How do I convert league to fathom?
Multiply the league value by 2640. The converter above does this instantly to whatever precision you set.
How do I convert fathom back to league?
Use the reverse factor: 1 fathom equals 0.0003787879 leagues. You can also use the swap control in the converter above to flip the direction instantly.
What is a league?
League (lea) is a unit of length.
What is a fathom?
Fathom (ftm) is a unit of length.
Is the league to fathom conversion exact?
Yes. Both league and fathom are defined by fixed standards rather than physical artifacts, so the factor of 2640 used above is exact to as many digits as you choose to display.