| 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 |
| foot | 6 ft | 12 ft | 18 ft | 24 ft | 30 ft | 36 ft | 42 ft | 48 ft | 54 ft | 60 ft | 66 ft | 72 ft | 78 ft | 84 ft | 90 ft | 96 ft | 102 ft | 108 ft | 114 ft | 120 ft | 126 ft | 132 ft | 138 ft | 144 ft | 150 ft | 156 ft | 162 ft | 168 ft | 174 ft | 180 ft | 186 ft | 192 ft | 198 ft | 204 ft | 210 ft | 216 ft | 222 ft | 228 ft | 234 ft | 240 ft | 246 ft | 252 ft | 258 ft | 264 ft | 270 ft | 276 ft | 282 ft | 288 ft | 294 ft | 300 ft | 306 ft | 312 ft | 318 ft | 324 ft | 330 ft | 336 ft | 342 ft | 348 ft | 354 ft | 360 ft | 366 ft | 372 ft | 378 ft | 384 ft | 390 ft | 396 ft | 402 ft | 408 ft | 414 ft | 420 ft | 426 ft | 432 ft | 438 ft | 444 ft | 450 ft | 456 ft | 462 ft | 468 ft | 474 ft | 480 ft | 486 ft | 492 ft | 498 ft | 504 ft | 510 ft | 516 ft | 522 ft | 528 ft | 534 ft | 540 ft | 546 ft | 552 ft | 558 ft | 564 ft | 570 ft | 576 ft | 582 ft | 588 ft | 594 ft | 600 ft |
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 | feet | fathoms | feet |
|---|---|---|---|
| 1 | = 6 | 4 | = 24 |
| 1.5 | = 9 | 4.5 | = 27 |
| 2 | = 12 | 5 | = 30 |
| 2.5 | = 15 | 5.5 | = 33 |
| 3 | = 18 | 6 | = 36 |
The foot (pl. feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| foot | ft | ≡ 0.3048 m ≡ 1⁄3 yd ≡ 12 inches | ≡ 0.3048 m | Imperial/US |
| feet | fathoms | feet | fathoms |
|---|---|---|---|
| 1 | = 0.16666666666667 | 4 | = 0.66666666666667 |
| 1.5 | = 0.25 | 4.5 | = 0.75 |
| 2 | = 0.33333333333333 | 5 | = 0.83333333333333 |
| 2.5 | = 0.41666666666667 | 5.5 | = 0.91666666666667 |
| 3 | = 0.5 | 6 | = 1 |
| fathoms | feet |
|---|---|
| 1 | = 6 |
| 0.1666667 | = 1 |
You can find the conversion in other languages in the following:
| 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 …) |