| rod | 1 rd | 2 rd | 3 rd | 4 rd | 5 rd | 6 rd | 7 rd | 8 rd | 9 rd | 10 rd | 11 rd | 12 rd | 13 rd | 14 rd | 15 rd | 16 rd | 17 rd | 18 rd | 19 rd | 20 rd | 21 rd | 22 rd | 23 rd | 24 rd | 25 rd | 26 rd | 27 rd | 28 rd | 29 rd | 30 rd | 31 rd | 32 rd | 33 rd | 34 rd | 35 rd | 36 rd | 37 rd | 38 rd | 39 rd | 40 rd | 41 rd | 42 rd | 43 rd | 44 rd | 45 rd | 46 rd | 47 rd | 48 rd | 49 rd | 50 rd | 51 rd | 52 rd | 53 rd | 54 rd | 55 rd | 56 rd | 57 rd | 58 rd | 59 rd | 60 rd | 61 rd | 62 rd | 63 rd | 64 rd | 65 rd | 66 rd | 67 rd | 68 rd | 69 rd | 70 rd | 71 rd | 72 rd | 73 rd | 74 rd | 75 rd | 76 rd | 77 rd | 78 rd | 79 rd | 80 rd | 81 rd | 82 rd | 83 rd | 84 rd | 85 rd | 86 rd | 87 rd | 88 rd | 89 rd | 90 rd | 91 rd | 92 rd | 93 rd | 94 rd | 95 rd | 96 rd | 97 rd | 98 rd | 99 rd | 100 rd |
| fathom | 2.75 ftm | 5.5 ftm | 8.25 ftm | 11 ftm | 13.75 ftm | 16.5 ftm | 19.25 ftm | 22 ftm | 24.75 ftm | 27.5 ftm | 30.25 ftm | 33 ftm | 35.75 ftm | 38.5 ftm | 41.25 ftm | 44 ftm | 46.75 ftm | 49.5 ftm | 52.25 ftm | 55 ftm | 57.75 ftm | 60.5 ftm | 63.25 ftm | 66 ftm | 68.75 ftm | 71.5 ftm | 74.25 ftm | 77 ftm | 79.75 ftm | 82.5 ftm | 85.25 ftm | 88 ftm | 90.75 ftm | 93.5 ftm | 96.25 ftm | 99 ftm | 101.75 ftm | 104.5 ftm | 107.25 ftm | 110 ftm | 112.75 ftm | 115.5 ftm | 118.25 ftm | 121 ftm | 123.75 ftm | 126.5 ftm | 129.25 ftm | 132 ftm | 134.75 ftm | 137.5 ftm | 140.25 ftm | 143 ftm | 145.75 ftm | 148.5 ftm | 151.25 ftm | 154 ftm | 156.75 ftm | 159.5 ftm | 162.25 ftm | 165 ftm | 167.75 ftm | 170.5 ftm | 173.25 ftm | 176 ftm | 178.75 ftm | 181.5 ftm | 184.25 ftm | 187 ftm | 189.75 ftm | 192.5 ftm | 195.25 ftm | 198 ftm | 200.75 ftm | 203.5 ftm | 206.25 ftm | 209 ftm | 211.75 ftm | 214.5 ftm | 217.25 ftm | 220 ftm | 222.75 ftm | 225.5 ftm | 228.25 ftm | 231 ftm | 233.75 ftm | 236.5 ftm | 239.25 ftm | 242 ftm | 244.75 ftm | 247.5 ftm | 250.25 ftm | 253 ftm | 255.75 ftm | 258.5 ftm | 261.25 ftm | 264 ftm | 266.75 ftm | 269.5 ftm | 272.25 ftm | 275 ftm |
The rod or perch or pole is a surveyors tool and unit of length equal to 5 1⁄2 yards, 16 1⁄2 feet, 1⁄320 of a statute mile or one-fourth of a surveyor's chain and 5.0292 meters.
| 1 rods = 2.75 fathoms | 4 rods = 11 fathoms |
| 1.5 rods = 4.125 fathoms | 4.5 rods = 12.375 fathoms |
| 2 rods = 5.5 fathoms | 5 rods = 13.75 fathoms |
| 2.5 rods = 6.875 fathoms | 5.5 rods = 15.125 fathoms |
| 3 rods = 8.25 fathoms | 6 rods = 16.5 fathoms |
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.
| 1 fathoms = 0.36363636363636 rods | 4 fathoms = 1.4545454545455 rods |
| 1.5 fathoms = 0.54545454545455 rods | 4.5 fathoms = 1.6363636363636 rods |
| 2 fathoms = 0.72727272727273 rods | 5 fathoms = 1.8181818181818 rods |
| 2.5 fathoms = 0.90909090909091 rods | 5.5 fathoms = 2 rods |
| 3 fathoms = 1.0909090909091 rods | 6 fathoms = 2.1818181818182 rods |
| 1 rods = 2.75 fathoms |
| 1 fathoms = 0.3636364 rods |