Convert fathoms to kilometers

1 ftm=0.001829km

Use the converter below to change any fathoms value into kilometers instantly — with formula, conversion table, and real-world examples.

You have

Equals

0.0018288

Conversion formula

Forward

kilometers = fathoms × 0.001829

Reverse

fathoms = kilometers × 546.807

Example: 10 ftm × 0.001829 = 0.01829 km.

About both units

From

Fathom

ftm

The fathom equals exactly 6 feet or 1.8288 meters. It is the traditional marine unit for water depth, used on older nautical charts and in recreational sailing. Modern charts mark depths in metres, but fathoms still appear in maritime literature and older US charts.

Real-world: A "mark twain" reading — made famous by the Mississippi riverboats — meant 2 fathoms (3.66 m) of water, the minimum safe depth.

Read full fathom reference →

Kilometer

The kilometer equals 1000 meters and is the standard unit for road distances in almost every country except the US and UK. Speed limits in Europe, Asia, Australia and most of Africa are given in km/h. A kilometer is roughly 1250 adult walking steps and takes about 12 minutes on foot.

Real-world: London to Paris by Eurostar is 344 km. A full marathon is 42.195 km. Most European motorway speed limits are 120–130 km/h.

Read full kilometer reference →

Fathom to Kilometer conversion table

Common fathoms to kilometers values for quick reference.

Fathom (ftm)	Kilometer (km)
1 ftm	0.001829 km
5 ftm	0.009144 km
10 ftm	0.01829 km
25 ftm	0.04572 km
50 ftm	0.09144 km
100 ftm	0.1829 km
250 ftm	0.4572 km
500 ftm	0.9144 km
1,000 ftm	1.8288 km
5,000 ftm	9.144 km

Tips & common mistakes

Quick tips

1 fathom = 2 yards = 6 feet = 1.8288 m.
Modern charts use metres internationally; fathoms are mostly historical.
The word "fathom" comes from Old English for "outstretched arms" — originally the span of an adult's arms.

Avoid these

Reading a modern chart that uses metres as if it were fathoms — a factor-of-1.83 depth error.
Confusing fathoms with feet on mixed-unit charts.
Assuming all US charts still use fathoms — NOAA has largely migrated to metres.

Frequently asked questions

How many kilometers in a fathom?

One fathom equals 0.001829 kilometers.

How do I convert fathoms to kilometers?

Multiply the fathom value by 0.001829 to get the equivalent in kilometers.

What is 100 fathoms in kilometers?

100 fathoms equals 0.1829 kilometers.

Is a fathom bigger than a kilometer?

No. 1 fathom equals 0.001829 kilometers, so one fathom is smaller.

How to convert fathoms to kilometers without a calculator?

Multiply by 0 for a quick estimate; use a calculator for precise results.

Related length conversions

📊 See full comparison matrix →

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