How many inches are in 1 fathom?

One fathom contains exactly 72 inches (6 feet x 12 inches/foot = 72 inches).

How do I convert fathoms to inches?

Multiply the fathom value by 72. For example, 5 fathoms = 5 x 72 = 360 inches (30 feet).

When would I need fathoms in inches?

When specifying anchor chain lengths, mooring line dimensions, or underwater construction measurements that require inch-level precision alongside fathom-based depth readings.

Fathoms to Inches (ftm to in) Converter

1 ftm = 72 in

1 Fathom equals 72 Inches (1 ftm = 72 in). Convert Fathoms to Inches with formula, table, and examples.

One fathom equals exactly 72 inches. Since 1 fathom = 6 feet and 1 foot = 12 inches, the calculation is 6 x 12 = 72. This conversion is used when detailed measurements of underwater objects, anchor chain lengths, or rope are needed in inch-level precision.

How to Convert Fathoms to Inches

in = ftm × 72

Multiply the value in Fathoms by 72

Take your value in Fathoms
Multiply by 72
Read the result in Inches

Common Fathoms to Inches Conversions

Fathoms (ftm)	Inches (in)	Status
0.1 ftm	7.2 in
0.25 ftm	18 in
0.5 ftm	36 in
1 ftm	72 in
2 ftm	144 in
5 ftm	360 in
10 ftm	720 in
20 ftm	1,440 in
50 ftm	3,600 in
100 ftm	7,200 in
200 ftm	14,400 in
500 ftm	36,000 in
1,000 ftm	72,000 in
6,000 ftm	432,000 in

Good to Know About Fathoms to Inches Conversion

Sailors traditionally measured anchor chain by pulling it through their hands, counting fathoms. But the chain links themselves were specified in inches. A '3/4-inch chain at 15 fathoms' mixes both units naturally in maritime practice.

Fathoms to Inches: What You Need to Know

A 10-fathom anchor chain is 720 inches long. Mooring line diameters are measured in inches while their lengths are measured in fathoms. A diver at 3 fathoms (216 inches / 18 feet) is at a typical recreational depth. Converting between fathoms and inches helps when specifying rope and chain dimensions.

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 Inch? in

An imperial unit of length equal to exactly 2.54 centimeters. Commonly used in the US and UK for screen sizes, body measurements, and construction.

Imperial Us-customary screen sizes construction (US) body measurements

Learn more about Inch →

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

Fathoms to Inches FAQ

One fathom contains exactly 72 inches (6 feet x 12 inches/foot = 72 inches).
Multiply the fathom value by 72. For example, 5 fathoms = 5 x 72 = 360 inches (30 feet).
When specifying anchor chain lengths, mooring line dimensions, or underwater construction measurements that require inch-level precision alongside fathom-based depth readings.

Non-Frequently Asked Questions About Fathoms to Inches

Questions nobody should ask - but someone did.

The Titanic sank in about 2,060 fathoms (12,500 feet = 150,000 inches). A sounding line to that depth would need 150,000 inches (3,810 meters) of rope. Nobody sounded that deep with rope. They used sonar decades later to find the wreck.
A typical pool is about 5-8 feet deep, or 60-96 inches. In fathoms, that is 0.83-1.33 fathoms. Saying 'my pool is one fathom deep' makes it sound more adventurous than '72 inches.' Real estate agents take note.
One inch (1/72 of a fathom) of water can be dangerous in flash floods because fast-moving water at even 6 inches exerts strong force. But in calm water, 1 inch is barely a puddle. The fathom concerns itself with more serious depths.