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 |
quarter | 8 qr. | 16 qr. | 24 qr. | 32 qr. | 40 qr. | 48 qr. | 56 qr. | 64 qr. | 72 qr. | 80 qr. | 88 qr. | 96 qr. | 104 qr. | 112 qr. | 120 qr. | 128 qr. | 136 qr. | 144 qr. | 152 qr. | 160 qr. | 168 qr. | 176 qr. | 184 qr. | 192 qr. | 200 qr. | 208 qr. | 216 qr. | 224 qr. | 232 qr. | 240 qr. | 248 qr. | 256 qr. | 264 qr. | 272 qr. | 280 qr. | 288 qr. | 296 qr. | 304 qr. | 312 qr. | 320 qr. | 328 qr. | 336 qr. | 344 qr. | 352 qr. | 360 qr. | 368 qr. | 376 qr. | 384 qr. | 392 qr. | 400 qr. | 408 qr. | 416 qr. | 424 qr. | 432 qr. | 440 qr. | 448 qr. | 456 qr. | 464 qr. | 472 qr. | 480 qr. | 488 qr. | 496 qr. | 504 qr. | 512 qr. | 520 qr. | 528 qr. | 536 qr. | 544 qr. | 552 qr. | 560 qr. | 568 qr. | 576 qr. | 584 qr. | 592 qr. | 600 qr. | 608 qr. | 616 qr. | 624 qr. | 632 qr. | 640 qr. | 648 qr. | 656 qr. | 664 qr. | 672 qr. | 680 qr. | 688 qr. | 696 qr. | 704 qr. | 712 qr. | 720 qr. | 728 qr. | 736 qr. | 744 qr. | 752 qr. | 760 qr. | 768 qr. | 776 qr. | 784 qr. | 792 qr. | 800 qr. |
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 | quarters | fathoms | quarters |
---|---|---|---|
1 | = 8 | 4 | = 32 |
1.5 | = 12 | 4.5 | = 36 |
2 | = 16 | 5 | = 40 |
2.5 | = 20 | 5.5 | = 44 |
3 | = 24 | 6 | = 48 |
The quarter (lit. "one-fourth") is used as the name of several distinct English units based on ¼ sizes of some base unit.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
quarter | qr. | ≡ 1⁄4 yd | = 0.2286 m | Metric system SI |
quarters | fathoms | quarters | fathoms |
---|---|---|---|
1 | = 0.125 | 4 | = 0.5 |
1.5 | = 0.1875 | 4.5 | = 0.5625 |
2 | = 0.25 | 5 | = 0.625 |
2.5 | = 0.3125 | 5.5 | = 0.6875 |
3 | = 0.375 | 6 | = 0.75 |
fathoms | quarters |
---|---|
1 | = 8 |
0.125 | = 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 …) |