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Leagues to Kilometers Converter

Enter a distance in leagues to convert to kilometres.

How it is calculated

The tool uses a league of exactly 3 statute miles: miles = leagues × 3 and km = leagues × 4.828032, since 1 mile is 1.609344 km. Both results are rounded to two decimals. Any number is accepted, with no limit and no negative check. The league has never been a single standard: land leagues, nautical leagues (3 nautical miles, about 5.56 km) and the old Spanish, French or Portuguese leagues all differ, so this tool shows only the 3-mile English-language convention. If a text clearly means another league, convert with that definition instead.

Worked example

Take the number in the title of a famous novel, 20,000 leagues. Miles: 20,000 × 3 = 60,000.00 mi. Kilometres: 20,000 × 4.828032 = 96,560.64 km. For comparison, the Earth's circumference is about 40,000 km, so this distance is more than twice around the planet, which shows the figure describes a travelled distance rather than a depth.

Try this example →

Common mistakes

  • Assuming one league has a single universal length; the tool uses the 3-mile league, but a nautical or old continental league is different.
  • Confusing the league (a distance) with the fathom (a depth) in sea-related texts.
  • Using the miles result as nautical miles, when it is statute miles (1.609344 km each).
  • Rounding 4.828 km to 5 km for a long distance, where the error grows with the number of leagues.

About this calculator

This calculator converts the league, a historical unit of distance, into kilometres and miles using 1 league ≈ 4.828 km (3 miles) — its most common definition, originally meant to represent the distance a person could walk in about an hour.

Leagues vary by country and era (land leagues, nautical leagues and different national definitions all differ slightly), but they live on in literature and popular culture — from Jules Verne's "Twenty Thousand Leagues Under the Sea" to seven-league boots in folklore — which is why readers and translators still need a reliable modern conversion.

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Comments (1)

  • Editorial team

    For folklore, seven-league boots cover 7 leagues per stride, which this tool turns into 33.80 km or 21.00 miles. A marathon of 42.195 km would take the wearer only a little over one stride. The result follows the 3-mile league, so a text with another definition will differ. Which book or story are you converting a distance for?

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