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 |
cubit | 3.6576 cubit | 7.3152 cubit | 10.9728 cubit | 14.6304 cubit | 18.288 cubit | 21.9456 cubit | 25.6032 cubit | 29.2608 cubit | 32.9184 cubit | 36.576 cubit | 40.2336 cubit | 43.8912 cubit | 47.5488 cubit | 51.2064 cubit | 54.864 cubit | 58.5216 cubit | 62.1792 cubit | 65.8368 cubit | 69.4944 cubit | 73.152 cubit | 76.8096 cubit | 80.4672 cubit | 84.1248 cubit | 87.7824 cubit | 91.44 cubit | 95.0976 cubit | 98.7552 cubit | 102.4128 cubit | 106.0704 cubit | 109.728 cubit | 113.3856 cubit | 117.0432 cubit | 120.7008 cubit | 124.3584 cubit | 128.016 cubit | 131.6736 cubit | 135.3312 cubit | 138.9888 cubit | 142.6464 cubit | 146.304 cubit | 149.9616 cubit | 153.6192 cubit | 157.2768 cubit | 160.9344 cubit | 164.592 cubit | 168.2496 cubit | 171.9072 cubit | 175.5648 cubit | 179.2224 cubit | 182.88 cubit | 186.5376 cubit | 190.1952 cubit | 193.8528 cubit | 197.5104 cubit | 201.168 cubit | 204.8256 cubit | 208.4832 cubit | 212.1408 cubit | 215.7984 cubit | 219.456 cubit | 223.1136 cubit | 226.7712 cubit | 230.4288 cubit | 234.0864 cubit | 237.744 cubit | 241.4016 cubit | 245.0592 cubit | 248.7168 cubit | 252.3744 cubit | 256.032 cubit | 259.6896 cubit | 263.3472 cubit | 267.0048 cubit | 270.6624 cubit | 274.32 cubit | 277.9776 cubit | 281.6352 cubit | 285.2928 cubit | 288.9504 cubit | 292.608 cubit | 296.2656 cubit | 299.9232 cubit | 303.5808 cubit | 307.2384 cubit | 310.896 cubit | 314.5536 cubit | 318.2112 cubit | 321.8688 cubit | 325.5264 cubit | 329.184 cubit | 332.8416 cubit | 336.4992 cubit | 340.1568 cubit | 343.8144 cubit | 347.472 cubit | 351.1296 cubit | 354.7872 cubit | 358.4448 cubit | 362.1024 cubit | 365.76 cubit |
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 | cubit | fathoms | cubit |
---|---|---|---|
1 | ≈ 3.6576 | 4 | ≈ 14.6304 |
1.5 | ≈ 5.4864 | 4.5 | ≈ 16.4592 |
2 | ≈ 7.3152 | 5 | ≈ 18.288 |
2.5 | ≈ 9.144 | 5.5 | ≈ 20.1168 |
3 | ≈ 10.9728 | 6 | ≈ 21.9456 |
The cubit is an ancient unit based on the forearm length from the tip of the middle finger to the bottom of the elbow. Cubits of various lengths were employed in many parts of the world in antiquity, during the Middle Ages and as recently as Early Modern Times. The term is still used in hedge laying, the length of the forearm being frequently used to determine the interval between stakes placed within the hedge.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
cubit | ≡ Distance from fingers to elbow ≈ 18 in | ≈ 0.5 m | Other (Length) |
cubit | fathoms | cubit | fathoms |
---|---|---|---|
1 | ≈ 0.27340332458443 | 4 | ≈ 1.0936132983377 |
1.5 | ≈ 0.41010498687664 | 4.5 | ≈ 1.2303149606299 |
2 | ≈ 0.54680664916885 | 5 | ≈ 1.3670166229221 |
2.5 | ≈ 0.68350831146107 | 5.5 | ≈ 1.5037182852143 |
3 | ≈ 0.82020997375328 | 6 | ≈ 1.6404199475066 |
fathoms | cubit |
---|---|
1 | ≈ 3.6576 |
0.2734033 | ≈ 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 …) |