How many thou are in 1 fathom?

One fathom contains exactly 72,000 thou (6 feet x 12,000 thou/foot).

When is this conversion needed?

In naval engineering where hull thickness (thou) must resist pressure from depth (fathoms).

Thou to Fathoms (thou to ftm) Converter

Q: How many fathoms is 1 thou?

One thou equals approximately 1.389 x 10-5 fathoms.

1 thou = 0.00001 ftm

1 Thou equals 0.00001 Fathoms (1 thou = 0.00001 ftm). Convert Thou to Fathoms with formula, table, and examples.

One thou equals approximately 1.389 x 10^-5 fathoms. A fathom (72,000 thou) contains 72,000 thou. The thou measures ship components; the fathom measures the water those components operate in.

How to Convert Thou to Fathoms

ftm = thou ÷ 72,000

Divide the value in Thou by 72,000

Take your value in Thou
Divide by 72,000
Read the result in Fathoms

Common Thou to Fathoms Conversions

Thou (thou)	Fathoms (ftm)	Status
1 thou	0.00001 ftm
100 thou	0.0014 ftm
1,000 thou	0.0139 ftm
10,000 thou	0.1389 ftm
50,000 thou	0.6944 ftm
72,000 thou	1 ftm
100,000 thou	1.3889 ftm
500,000 thou	6.9444 ftm
1,000,000 thou	13.8889 ftm

Good to Know About Thou to Fathoms Conversion

A ship hull is specified in thou and tested in fathoms. Every thou of thickness buys safety against fathoms of pressure. Naval engineering is the profession where thou-precision meets fathom-scale consequences.

Thou to Fathoms: What You Need to Know

A fathom is 72,000 thou. Hull plating at 1,000 thou (1 inch) thick operates in water measured in fathoms. Ship engineering bridges thou-precision and fathom-depth.

What is a Thou? thou

One thousandth of an inch (0.0254 mm). Also called a mil in the US. Used in engineering, manufacturing, and for measuring thin materials like plastic film.

Imperial engineering plastic film thickness wire gauges

Learn more about Thou →

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 →

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

Thou to Fathoms FAQ

One thou equals approximately 1.389 x 10^-5 fathoms.
One fathom contains exactly 72,000 thou (6 feet x 12,000 thou/foot).
In naval engineering where hull thickness (thou) must resist pressure from depth (fathoms).

Non-Frequently Asked Questions About Thou to Fathoms

Questions nobody should ask - but someone did.

A typical hull is 1,000 thou (1 inch / 25 mm) thick. Each fathom of depth adds about 2.7 psi of pressure. At 300 fathoms (submarine depth), pressure is about 810 psi. 1,000 thou of steel resists 810 psi. That is about 0.81 psi per thou per fathom. Engineering at its tightest.
A loaded cargo ship sinks about 10 m (394,000 thou) deeper than when empty. That is about 5.47 fathoms of additional draft. Loading a ship converts cargo weight into fathoms of submersion, measured in thou at the waterline marks.
Barnacles grow about 200 thou (5 mm) per month regardless of depth (in the photic zone). But below about 100 fathoms, there is too little light for barnacle growth. So the thou-per-fathom ratio is about 200 thou near surface and 0 thou below 100 fathoms. Depth solves the barnacle problem.