Convert Inches (in) to Fathoms (ftm)

1 inch equals 0.0138889 fathoms.

Formula: ftm = in × 0.0138889

Inch to Fathom Converter

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How to Convert Inch to Fathom

1 inch = 0.0138889 fathoms

Fathom = Inch × 0.0138889

Example: 1 in × 0.0138889 = 0.0138889 ftm

Reverse Conversion

To convert fathoms back to inches:

  • Remember, 1 fathom equals 72 inches.
  • To convert 0.0138889 ftm to in, multiply 0.0138889 x 72, resulting in 1 in.

Fractional Inches to Fathom Chart

Common fractional inch values and their equivalents in ftm. Useful for machining, woodworking, drill bits, and precision measurements.

Fractions of an inch (1/64″ to 1″)
Fraction (in) Decimal (in) ftm
1/64″ 0.0156 0.0002
1/32″ 0.0313 0.0004
3/64″ 0.0469 0.0007
1/16″ 0.0625 0.0009
5/64″ 0.0781 0.0011
3/32″ 0.0938 0.0013
7/64″ 0.1094 0.0015
1/8″ 0.1250 0.0017
9/64″ 0.1406 0.0020
5/32″ 0.1563 0.0022
11/64″ 0.1719 0.0024
3/16″ 0.1875 0.0026
13/64″ 0.2031 0.0028
7/32″ 0.2188 0.0030
15/64″ 0.2344 0.0033
1/4″ 0.2500 0.0035
17/64″ 0.2656 0.0037
9/32″ 0.2813 0.0039
19/64″ 0.2969 0.0041
5/16″ 0.3125 0.0043
21/64″ 0.3281 0.0046
11/32″ 0.3438 0.0048
23/64″ 0.3594 0.0050
3/8″ 0.3750 0.0052
25/64″ 0.3906 0.0054
13/32″ 0.4063 0.0056
27/64″ 0.4219 0.0059
7/16″ 0.4375 0.0061
29/64″ 0.4531 0.0063
15/32″ 0.4688 0.0065
31/64″ 0.4844 0.0067
1/2″ 0.5000 0.0069
33/64″ 0.5156 0.0072
17/32″ 0.5313 0.0074
35/64″ 0.5469 0.0076
9/16″ 0.5625 0.0078
37/64″ 0.5781 0.0080
19/32″ 0.5938 0.0082
39/64″ 0.6094 0.0085
5/8″ 0.6250 0.0087
41/64″ 0.6406 0.0089
21/32″ 0.6563 0.0091
43/64″ 0.6719 0.0093
11/16″ 0.6875 0.0095
45/64″ 0.7031 0.0098
23/32″ 0.7188 0.0100
47/64″ 0.7344 0.0102
3/4″ 0.7500 0.0104
49/64″ 0.7656 0.0106
25/32″ 0.7813 0.0109
51/64″ 0.7969 0.0111
13/16″ 0.8125 0.0113
53/64″ 0.8281 0.0115
27/32″ 0.8438 0.0117
55/64″ 0.8594 0.0119
7/8″ 0.8750 0.0122
57/64″ 0.8906 0.0124
29/32″ 0.9063 0.0126
59/64″ 0.9219 0.0128
15/16″ 0.9375 0.0130
61/64″ 0.9531 0.0132
31/32″ 0.9688 0.0135
63/64″ 0.9844 0.0137
1″ 1.0000 0.0139
Whole inches (2″ to 12″)
Inches ftm
2″ 0.0278
3″ 0.0417
4″ 0.0556
5″ 0.0694
6″ 0.0833
7″ 0.0972
8″ 0.1111
9″ 0.1250
10″ 0.1389
11″ 0.1528
12″ 0.1667

Bold rows indicate common fractions (1/8, 1/4, 3/8, 1/2, etc.). The conversion factor 1 inch = 25.4 mm is exact by international definition.

Common Inch to Fathom Conversions

Inch to Fathom (Part 1)
Inch Fathom Actions
1 inch 0.0138889 fathoms
5 inches 0.0694444 fathoms
10 inches 0.138889 fathoms
25 inches 0.347222 fathoms
Inch to Fathom (Part 2)
Inch Fathom Actions
50 inches 0.694444 fathoms
100 inches 1.38889 fathoms
500 inches 6.94444 fathoms
1000 inches 13.8889 fathoms

Inches to fathoms Conversion Table

Reference table with common inches to fathoms conversions. All values calculated with high precision.

Inches to Fathoms Table
0.01 to 50

Inches Fathoms Actions
0.01 in 0.000138889 ftm
0.025 in 0.000347222 ftm
0.05 in 0.000694444 ftm
0.1 in 0.00138889 ftm
14 in 0.00347222 ftm
12 in 0.00694444 ftm
1 in 0.0138889 ftm
2 12 in 0.0347222 ftm
5 in 0.0694444 ftm
10 in 0.138889 ftm
25 in 0.347222 ftm
50 in 0.694444 ftm

Inches to Fathoms Table
100 to 10000000

Inches Fathoms Actions
100 in 1.38889 ftm
250 in 3.47222 ftm
500 in 6.94444 ftm
1000 in 13.8889 ftm
2500 in 34.7222 ftm
5000 in 69.4444 ftm
10000 in 138.889 ftm
25000 in 347.222 ftm
50000 in 694.444 ftm
100000 in 1388.89 ftm
250000 in 3472.22 ftm
500000 in 6944.44 ftm
1000000 in 13888.9 ftm
2500000 in 34722.2 ftm
5000000 in 69444.4 ftm
10000000 in 138889 ftm

Fathoms to Inches Table
0.0001 to 12

Fathoms Inches Actions
0.0001 ftm 0.0072 in
0.00025 ftm 0.018 in
0.0005 ftm 0.036 in
0.001 ftm 0.072 in
0.0025 ftm 0.18 in
0.005 ftm 0.36 in
0.01 ftm 0.72 in
0.025 ftm 1.8 in
0.05 ftm 3.6 in
0.1 ftm 7 15 in
14 ftm 18 in
12 ftm 36 in

Fathoms to Inches Table
1 to 100000

Fathoms Inches Actions
1 ftm 72 in
2 12 ftm 180 in
5 ftm 360 in
10 ftm 720 in
25 ftm 1800 in
50 ftm 3600 in
100 ftm 7200 in
250 ftm 18000 in
500 ftm 36000 in
1000 ftm 72000 in
2500 ftm 180000 in
5000 ftm 360000 in
10000 ftm 720000 in
25000 ftm 1800000 in
50000 ftm 3600000 in
100000 ftm 7200000 in

Definition of Inch

Definition
Imperial/US customary unit standardized as exactly 25.4 millimeters since 1959.
Exact factor
1 in = 25.4 mm = 2.54 cm
Sources
NIST SP 811

Definition of Fathom

Definition
Maritime unit equal to six feet, traditionally used for measuring water depth.
Exact factor
1 fathom = 6 ft = 1.8288 m
Sources
NIST SP 811

About the Inch

Facts & Uses

  • Dominant in US construction, plumbing (pipe diameters), electronics (screen sizes), and hardware (screws, bolts).
  • Screen technology: TVs, monitors, phones measured diagonally in inches; DPI (dots per inch) defines display resolution.
  • Fractional system in construction: 1/2", 1/4", 1/8", 1/16" for precise fitting; decimal inches in engineering and machining.
  • Paper sizes: US letter 8.5 × 11 inches, legal 8.5 × 14 inches; tire dimensions use inches for rim diameter.

Curiosities

  • Historical origin: three barleycorns placed end-to-end; width of adult thumb at knuckle.
  • Exactly 25.4 mm since 1959 international agreement, ending slight variations between countries.
  • Symbol "" (double prime) distinguishes from feet (') in architectural and engineering drawings.
  • Smartphone screens paradox: measured diagonally in inches despite metric internal components and manufacturing.

Sources

About the Fathom

Facts & Uses

  • Maritime depth: traditional water depth measurement for navigation, anchoring, and harbor charts.
  • Nautical tradition: ship rigging measurements, rope lengths, and cable specifications in traditional sailing.
  • Fishing industry: net depths, fishing line measurements, and commercial fishing equipment specifications.
  • Historical surveying: land measurement in coastal areas, maritime boundaries, and underwater mapping.

Curiosities

  • Origin: span of outstretched arms; "fathom" derives from Old English fæðm meaning "embrace".
  • Modern definition: exactly 6 feet = 1.8288 meters; standardized for international navigation safety.
  • Literary usage: "to fathom" meaning "to understand deeply" comes from measuring unknown depths.
  • Largely replaced by meters in modern navigation, but persists in traditional sailing and historical contexts.

Sources

Frequently Asked Questions

How many fathoms are in one inch?

One inch equals 0.0138889 fathoms. To convert, multiply the inch value by 0.0138889. For the reverse, divide the fathom value by 0.0138889 (or multiply by 72).

What is 0.11 inches in fathoms?

0.11 inches = 0.0015278 fathoms. This is one of the most commonly searched conversions for this pair.

How precise is the inch-to-fathom conversion?

The factor 0.0138889 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.

Looking for the reverse? Convert Fathom to Inch

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Conversion factors verified against NIST, BIPM, ISO 80000-3 1 inch = 2.54 cm by international agreement (1959). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.