| 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 |
| metric inch | 4 572 in (metric) | 9 144 in (metric) | 13 716 in (metric) | 18 288 in (metric) | 22 860 in (metric) | 27 432 in (metric) | 32 004 in (metric) | 36 576 in (metric) | 41 148 in (metric) | 45 720 in (metric) | 50 292 in (metric) | 54 864 in (metric) | 59 436 in (metric) | 64 008 in (metric) | 68 580 in (metric) | 73 152 in (metric) | 77 724 in (metric) | 82 296 in (metric) | 86 868 in (metric) | 91 440 in (metric) | 96 012 in (metric) | 100 584 in (metric) | 105 156 in (metric) | 109 728 in (metric) | 114 300 in (metric) | 118 872 in (metric) | 123 444 in (metric) | 128 016 in (metric) | 132 588 in (metric) | 137 160 in (metric) | 141 732 in (metric) | 146 304 in (metric) | 150 876 in (metric) | 155 448 in (metric) | 160 020 in (metric) | 164 592 in (metric) | 169 164 in (metric) | 173 736 in (metric) | 178 308 in (metric) | 182 880 in (metric) | 187 452 in (metric) | 192 024 in (metric) | 196 596 in (metric) | 201 168 in (metric) | 205 740 in (metric) | 210 312 in (metric) | 214 884 in (metric) | 219 456 in (metric) | 224 028 in (metric) | 228 600 in (metric) | 233 172 in (metric) | 237 744 in (metric) | 242 316 in (metric) | 246 888 in (metric) | 251 460 in (metric) | 256 032 in (metric) | 260 604 in (metric) | 265 176 in (metric) | 269 748 in (metric) | 274 320 in (metric) | 278 892 in (metric) | 283 464 in (metric) | 288 036 in (metric) | 292 608 in (metric) | 297 180 in (metric) | 301 752 in (metric) | 306 324 in (metric) | 310 896 in (metric) | 315 468 in (metric) | 320 040 in (metric) | 324 612 in (metric) | 329 184 in (metric) | 333 756 in (metric) | 338 328 in (metric) | 342 900 in (metric) | 347 472 in (metric) | 352 044 in (metric) | 356 616 in (metric) | 361 188 in (metric) | 365 760 in (metric) | 370 332 in (metric) | 374 904 in (metric) | 379 476 in (metric) | 384 048 in (metric) | 388 620 in (metric) | 393 192 in (metric) | 397 764 in (metric) | 402 336 in (metric) | 406 908 in (metric) | 411 480 in (metric) | 416 052 in (metric) | 420 624 in (metric) | 425 196 in (metric) | 429 768 in (metric) | 434 340 in (metric) | 438 912 in (metric) | 443 484 in (metric) | 448 056 in (metric) | 452 628 in (metric) | 457 200 in (metric) |
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 | metric inches | fathoms | metric inches |
|---|---|---|---|
| 1 | = 4572 | 4 | = 18288 |
| 1.5 | = 6858 | 4.5 | = 20574 |
| 2 | = 9144 | 5 | = 22860 |
| 2.5 | = 11430 | 5.5 | = 25146 |
| 3 | = 13716 | 6 | = 27432 |
A metric inch is a nickname for a preferred 1⁄4 subdivision of an ISO 2848 basic module, or 1⁄12 of a metric foot measuring 25 millimetres (0.984 in). A metric inch is 0.4 millimetres (0.016 in) shorter than an inch.
The term was similarly used to refer to the historical Soviet Bloc practice of spacing integrated circuit pins at 1⁄10 of a 25 mm "metric inch" length, instead of the western practice of 1⁄10 of an imperial inch.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| metric inch | in (metric) | = 0.016 in | = 0.0004 m | Metric system SI |
| metric inches | fathoms | metric inches | fathoms |
|---|---|---|---|
| 1 | = 0.00021872265966754 | 4 | = 0.00087489063867017 |
| 1.5 | = 0.00032808398950131 | 4.5 | = 0.00098425196850394 |
| 2 | = 0.00043744531933508 | 5 | = 0.0010936132983377 |
| 2.5 | = 0.00054680664916885 | 5.5 | = 0.0012029746281715 |
| 3 | = 0.00065616797900262 | 6 | = 0.0013123359580052 |
| fathoms | metric inches |
|---|---|
| 1 | = 4 572 |
| 0.0002187 | = 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 …) |