How many kilometers is 1 fathom?

One fathom equals exactly 0.0018288 km (1.8288 meters). Since 1 fathom = 6 feet = 1.8288 m = 0.0018288 km.

How do I convert fathoms to kilometers?

Multiply the fathom value by 0.0018288. For example, 1,000 fathoms = 1.8288 km. For quick estimation, multiply fathoms by 0.0018.

How deep is the ocean in kilometers?

The average ocean depth is about 3.69 km (2,017 fathoms). The deepest point (Challenger Deep) is about 10.99 km (6,011 fathoms). The shallowest seas are less than 0.1 km (55 fathoms).

Fathoms to Kilometers (ftm to km) Converter

1 ftm = 0.0018 km

1 Fathom equals 0.0018 Kilometers (1 ftm = 0.0018 km). Convert Fathoms to Kilometers with formula, table, and examples.

One fathom equals exactly 0.0018288 kilometers, or about 1.83 meters. This conversion is essential for expressing nautical chart depths in modern metric distances. The world's oceans range from 0 to about 11 km deep (about 6,000 fathoms), making the fathom-to-kilometer conversion important for oceanography.

How to Convert Fathoms to Kilometers

km = ftm × 0.0018288

Multiply the value in Fathoms by 0.0018288

Take your value in Fathoms
Multiply by 0.0018288
Read the result in Kilometers

Common Fathoms to Kilometers Conversions

Fathoms (ftm)	Kilometers (km)	Status
1 ftm	0.0018 km
5 ftm	0.0091 km
10 ftm	0.0183 km
50 ftm	0.0914 km
100 ftm	0.1829 km
500 ftm	0.9144 km
1,000 ftm	1.8288 km
5,000 ftm	9.144 km
6,000 ftm	10.9728 km
10,000 ftm	18.288 km
50,000 ftm	91.44 km

Good to Know About Fathoms to Kilometers Conversion

Oceanography has largely switched from fathoms to meters and kilometers, but legacy data from centuries of naval surveys remains in fathoms. Converting this historical depth data to kilometers is an ongoing task in marine science.

Fathoms to Kilometers: What You Need to Know

The Challenger Deep at about 6,011 fathoms is approximately 10.99 km (10,994 m) deep. Average ocean depth is about 2,000 fathoms (3.66 km). A shipping channel at 10 fathoms is 0.018 km (18.3 m). Modern oceanographic papers report depths in kilometers or meters, requiring conversion from legacy fathom data.

What is a Fathom? ftm

Exactly 6 feet (1.8288 m). Traditionally used to measure water depth in nautical contexts. Originally based on the span of outstretched arms.

Imperial water depth nautical marine charts

Learn more about Fathom →

What is a Kilometer? km

A metric unit of length equal to 1000 meters. The standard unit for measuring road distances and geographic distances in most countries.

Metric road distances geography running

Learn more about Kilometer →

Going the other way? Use our Kilometers to Fathoms converter.

Fathoms to Kilometers FAQ

One fathom equals exactly 0.0018288 km (1.8288 meters). Since 1 fathom = 6 feet = 1.8288 m = 0.0018288 km.
Multiply the fathom value by 0.0018288. For example, 1,000 fathoms = 1.8288 km. For quick estimation, multiply fathoms by 0.0018.
The average ocean depth is about 3.69 km (2,017 fathoms). The deepest point (Challenger Deep) is about 10.99 km (6,011 fathoms). The shallowest seas are less than 0.1 km (55 fathoms).

Non-Frequently Asked Questions About Fathoms to Kilometers

Questions nobody should ask - but someone did.

The Mariana Trench is about 6,011 fathoms (10.994 km) deep. Mount Everest is 8.849 km tall. So yes, the ocean is about 1.24 times deeper than Everest is tall. If you dropped Everest into the Trench, it would be submerged with 2.1 km of water overhead.
A marathon (42.195 km = 42,195 m) is about 23,072 fathoms. That is about 3.8 times deeper than the Mariana Trench. Running a marathon covers more distance than the ocean's maximum depth. Take that, ocean.
An average swimmer descends at about 0.5 m/s = 1.8 km/h = about 985 fathoms per hour. At that rate, reaching the bottom of the Mariana Trench would take about 6.1 hours. No human can hold their breath that long. Or survive the pressure. Or swim that consistently.