Leagues to Miles Converter
The league is an old unit whose length was not always the same. This converter makes you choose your league type (English, nautical, French) and then converts to miles, kilometers and meters, so you get an unambiguous value.
Set if your source uses another league.
Result
Miles
3.000000
Kilometers
4.828032
Meters
4828.032
Converted 1 English league → 3 mi → 4.8280 km
Reference: common league definitions
| League type | Miles | Kilometers | Notes |
|---|---|---|---|
| English land league | 3 mi | 4.828032 km | 3 statute miles (1 mi = 1609.344 m) |
| Nautical league | 3 nmi | 5.556 km | 1 nmi = 1852 m → 3 × 1852 = 5556 m |
| French league (lieue) | ~2.48548 mi | 4 km | Often rounded to 4 km |
How the converter works
Because “league” isn’t a fixed modern SI unit, we normalize each variant to meters, then to miles and kilometers.
Formulas
English land league: 1 league = 3 × 1609.344 m = 4828.032 m
Nautical league: 1 league = 3 × 1852 m = 5556 m
French league: 1 league = 4000 m
Then: miles = meters / 1609.344; kilometers = meters / 1000
Example
Convert 2 nautical leagues:
2 × 5556 m = 11,112 m → 11,112 / 1609.344 = 6.904 mi → 11.112 km
Always match the source document’s league definition (historical texts often mean French leagues).
Formula (LaTeX) + variables + units
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English land league: 1 league = 3 × 1609.344 m = 4828.032 m Nautical league: 1 league = 3 × 1852 m = 5556 m French league: 1 league = 4000 m Then: miles = meters / 1609.344; kilometers = meters / 1000
- No variables provided in audit spec.
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
Last code update: 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
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