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, metric | 5.7831734 mf | 11.5663468 mf | 17.3495202 mf | 23.1326935 mf | 28.9158669 mf | 34.6990403 mf | 40.4822137 mf | 46.2653871 mf | 52.0485605 mf | 57.8317338 mf | 63.6149072 mf | 69.3980806 mf | 75.1812540 mf | 80.9644274 mf | 86.7476008 mf | 92.5307742 mf | 98.3139475 mf | 104.0971209 mf | 109.8802943 mf | 115.6634677 mf | 121.4466411 mf | 127.2298145 mf | 133.0129879 mf | 138.7961612 mf | 144.5793346 mf | 150.3625080 mf | 156.1456814 mf | 161.9288548 mf | 167.7120282 mf | 173.4952015 mf | 179.2783749 mf | 185.0615483 mf | 190.8447217 mf | 196.6278951 mf | 202.4110685 mf | 208.1942419 mf | 213.9774152 mf | 219.7605886 mf | 225.5437620 mf | 231.3269354 mf | 237.1101088 mf | 242.8932822 mf | 248.6764555 mf | 254.4596289 mf | 260.2428023 mf | 266.0259757 mf | 271.8091491 mf | 277.5923225 mf | 283.3754959 mf | 289.1586692 mf | 294.9418426 mf | 300.7250160 mf | 306.5081894 mf | 312.2913628 mf | 318.0745362 mf | 323.8577096 mf | 329.6408829 mf | 335.4240563 mf | 341.2072297 mf | 346.9904031 mf | 352.7735765 mf | 358.5567499 mf | 364.3399232 mf | 370.1230966 mf | 375.9062700 mf | 381.6894434 mf | 387.4726168 mf | 393.2557902 mf | 399.0389636 mf | 404.8221369 mf | 410.6053103 mf | 416.3884837 mf | 422.1716571 mf | 427.9548305 mf | 433.7380039 mf | 439.5211772 mf | 445.3043506 mf | 451.0875240 mf | 456.8706974 mf | 462.6538708 mf | 468.4370442 mf | 474.2202176 mf | 480.0033909 mf | 485.7865643 mf | 491.5697377 mf | 497.3529111 mf | 503.1360845 mf | 508.9192579 mf | 514.7024313 mf | 520.4856046 mf | 526.2687780 mf | 532.0519514 mf | 537.8351248 mf | 543.6182982 mf | 549.4014716 mf | 555.1846449 mf | 560.9678183 mf | 566.7509917 mf | 572.5341651 mf | 578.3173385 mf |
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, metric | fathoms | feet, metric |
---|---|---|---|
1 | ≈ 5.7831733848581 | 4 | ≈ 23.132693539432 |
1.5 | ≈ 8.6747600772872 | 4.5 | ≈ 26.024280231861 |
2 | ≈ 11.566346769716 | 5 | ≈ 28.915866924291 |
2.5 | ≈ 14.457933462145 | 5.5 | ≈ 31.80745361672 |
3 | ≈ 17.349520154574 | 6 | ≈ 34.699040309149 |
A metric foot is a nickname for a preferred number length of 3 basic modules (3 M), or 30 centimetres (11.811 in). The 30 cm metric ruler was a similar length to the traditional imperial one-foot ruler. A metric foot is 4.8 millimetres (0.189 in) shorter than an imperial foot.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
foot, metric | mf | ≡ √ 1⁄10 m | ≈ 0.31622776602 m | Metric system Non-SI |
feet, metric | fathoms | feet, metric | fathoms |
---|---|---|---|
1 | ≈ 0.17291544511155 | 4 | ≈ 0.69166178044619 |
1.5 | ≈ 0.25937316766732 | 4.5 | ≈ 0.77811950300197 |
2 | ≈ 0.3458308902231 | 5 | ≈ 0.86457722555774 |
2.5 | ≈ 0.43228861277887 | 5.5 | ≈ 0.95103494811352 |
3 | ≈ 0.51874633533465 | 6 | ≈ 1.0374926706693 |
fathoms | feet, metric |
---|---|
1 | ≈ 5.7831734 |
0.1729154 | ≈ 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 …) |