UnitConvConvert
Length

Convert fathoms to inches

1 ftm=72in

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

72

Conversion formula

Forward
inches = fathoms × 72
Reverse
fathoms = inches × 0.01389

Example: 10 ftm × 72 = 720 in.

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 →
To

Inch

in

The inch equals 2.54 centimeters exactly since 1959. It is the global standard for screen diagonal sizes — a "55-inch TV" has a 139.7 cm diagonal. Pipe diameters, US and UK shoe sizes, and hard-drive form factors are all specified in inches. 1 inch = 1/12 foot = 1/36 yard.

Real-world: A 65-inch TV has a 165 cm diagonal. A smartphone screen is typically 6–7 inches. Standard copper plumbing in the UK is ½ inch or ¾ inch.
Read full inch reference →

Fathom to Inch conversion table

Common fathoms to inches values for quick reference.

Fathom (ftm)Inch (in)
1 ftm72 in
5 ftm360 in
10 ftm720 in
25 ftm1,800 in
50 ftm3,600 in
100 ftm7,200 in
250 ftm18,000 in
500 ftm36,000 in
1,000 ftm72,000 in
5,000 ftm360,000 in

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 inches in a fathom?
One fathom equals 72 inches.
How do I convert fathoms to inches?
Multiply the fathom value by 72 to get the equivalent in inches.
What is 100 fathoms in inches?
100 fathoms equals 7,200 inches.
Is a fathom bigger than a inch?
Yes. 1 fathom equals 72 inches, so one fathom is larger.
How to convert fathoms to inches without a calculator?
Multiply by 72 for a quick estimate; use a calculator for precise results.

Related length conversions

📊 See full comparison matrix →

More from Fathom

ftm → m
1 = 1.8288 m
ftm → km
1 = 0.001829 km
ftm → cm
1 = 182.88 cm
ftm → mm
1 = 1,828.8 mm
ftm → mi
1 = 0.001136 mi
ftm → yd
1 = 2 yd
ftm → ft
1 = 6 ft
ftm → nmi
1 = 0.0009875 nmi

More to Inch

m → in
1 = 39.3701 in
km → in
1 = 39,370.08 in
cm → in
1 = 0.3937 in
mm → in
1 = 0.03937 in
mi → in
1 = 63,360 in
yd → in
1 = 36 in
ft → in
1 = 12 in
nmi → in
1 = 72,913.39 in

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