fathom | 1 ftm | 2 ftm | 3 ftm | 4 ftm | 5 ftm | 6 ftm | 7 ftm | 8 ftm | 9 ftm | 10 ftm | 11 ftm | 12 ftm | 13 ftm | 14 ftm | 15 ftm | 16 ftm | 17 ftm | 18 ftm | 19 ftm | 20 ftm | 21 ftm | 22 ftm | 23 ftm | 24 ftm | 25 ftm | 26 ftm | 27 ftm | 28 ftm | 29 ftm | 30 ftm | 31 ftm | 32 ftm | 33 ftm | 34 ftm | 35 ftm | 36 ftm | 37 ftm | 38 ftm | 39 ftm | 40 ftm | 41 ftm | 42 ftm | 43 ftm | 44 ftm | 45 ftm | 46 ftm | 47 ftm | 48 ftm | 49 ftm | 50 ftm | 51 ftm | 52 ftm | 53 ftm | 54 ftm | 55 ftm | 56 ftm | 57 ftm | 58 ftm | 59 ftm | 60 ftm | 61 ftm | 62 ftm | 63 ftm | 64 ftm | 65 ftm | 66 ftm | 67 ftm | 68 ftm | 69 ftm | 70 ftm | 71 ftm | 72 ftm | 73 ftm | 74 ftm | 75 ftm | 76 ftm | 77 ftm | 78 ftm | 79 ftm | 80 ftm | 81 ftm | 82 ftm | 83 ftm | 84 ftm | 85 ftm | 86 ftm | 87 ftm | 88 ftm | 89 ftm | 90 ftm | 91 ftm | 92 ftm | 93 ftm | 94 ftm | 95 ftm | 96 ftm | 97 ftm | 98 ftm | 99 ftm | 100 ftm |
rope | 0.3 rope | 0.6 rope | 0.9 rope | 1.2 rope | 1.5 rope | 1.8 rope | 2.1 rope | 2.4 rope | 2.7 rope | 3 rope | 3.3 rope | 3.6 rope | 3.9 rope | 4.2 rope | 4.5 rope | 4.8 rope | 5.1 rope | 5.4 rope | 5.7 rope | 6 rope | 6.3 rope | 6.6 rope | 6.9 rope | 7.2 rope | 7.5 rope | 7.8 rope | 8.1 rope | 8.4 rope | 8.7 rope | 9 rope | 9.3 rope | 9.6 rope | 9.9 rope | 10.2 rope | 10.5 rope | 10.8 rope | 11.1 rope | 11.4 rope | 11.7 rope | 12 rope | 12.3 rope | 12.6 rope | 12.9 rope | 13.2 rope | 13.5 rope | 13.8 rope | 14.1 rope | 14.4 rope | 14.7 rope | 15 rope | 15.3 rope | 15.6 rope | 15.9 rope | 16.2 rope | 16.5 rope | 16.8 rope | 17.1 rope | 17.4 rope | 17.7 rope | 18 rope | 18.3 rope | 18.6 rope | 18.9 rope | 19.2 rope | 19.5 rope | 19.8 rope | 20.1 rope | 20.4 rope | 20.7 rope | 21 rope | 21.3 rope | 21.6 rope | 21.9 rope | 22.2 rope | 22.5 rope | 22.8 rope | 23.1 rope | 23.4 rope | 23.7 rope | 24 rope | 24.3 rope | 24.6 rope | 24.9 rope | 25.2 rope | 25.5 rope | 25.8 rope | 26.1 rope | 26.4 rope | 26.7 rope | 27 rope | 27.3 rope | 27.6 rope | 27.9 rope | 28.2 rope | 28.5 rope | 28.8 rope | 29.1 rope | 29.4 rope | 29.7 rope | 30 rope |
A fathom is a unit of length in the imperial and the U.S. customary systems equal to 6 feet (1.8288 metres), used especially for measuring the depth of water.
There are two yards (6 feet) in an imperial fathom. Originally the span of a man's outstretched arms, the size of a fathom has varied slightly depending on whether it was defined as a thousandth of an (Admiralty) nautical mile or as a multiple of the imperial yard. Formerly, the term was used for any of several units of length varying around 5–5 1⁄2 feet.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
fathom | ftm | ≡ 6 ft | = 1.8288 m | Imperial/US |
fathoms | ropes | fathoms | ropes |
---|---|---|---|
1 | = 0.3 | 4 | = 1.2 |
1.5 | = 0.45 | 4.5 | = 1.35 |
2 | = 0.6 | 5 | = 1.5 |
2.5 | = 0.75 | 5.5 | = 1.65 |
3 | = 0.9 | 6 | = 1.8 |
A rope may refer to any of several units of measurement initially determined or formed by ropes or knotted cords.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
rope | rope | ≡ 20 ft | = 6.096 m | Other (Length) |
ropes | fathoms | ropes | fathoms |
---|---|---|---|
1 | = 3.3333333333333 | 4 | = 13.333333333333 |
1.5 | = 5 | 4.5 | = 15 |
2 | = 6.6666666666667 | 5 | = 16.666666666667 |
2.5 | = 8.3333333333333 | 5.5 | = 18.333333333333 |
3 | = 10 | 6 | = 20 |
fathoms | ropes |
---|---|
1 | = 0.3 |
3.3333333 | = 1 |
Symbol | Definition |
---|---|
≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |