| metric inch | 1 in (metric) | 2 in (metric) | 3 in (metric) | 4 in (metric) | 5 in (metric) | 6 in (metric) | 7 in (metric) | 8 in (metric) | 9 in (metric) | 10 in (metric) | 11 in (metric) | 12 in (metric) | 13 in (metric) | 14 in (metric) | 15 in (metric) | 16 in (metric) | 17 in (metric) | 18 in (metric) | 19 in (metric) | 20 in (metric) | 21 in (metric) | 22 in (metric) | 23 in (metric) | 24 in (metric) | 25 in (metric) | 26 in (metric) | 27 in (metric) | 28 in (metric) | 29 in (metric) | 30 in (metric) | 31 in (metric) | 32 in (metric) | 33 in (metric) | 34 in (metric) | 35 in (metric) | 36 in (metric) | 37 in (metric) | 38 in (metric) | 39 in (metric) | 40 in (metric) | 41 in (metric) | 42 in (metric) | 43 in (metric) | 44 in (metric) | 45 in (metric) | 46 in (metric) | 47 in (metric) | 48 in (metric) | 49 in (metric) | 50 in (metric) | 51 in (metric) | 52 in (metric) | 53 in (metric) | 54 in (metric) | 55 in (metric) | 56 in (metric) | 57 in (metric) | 58 in (metric) | 59 in (metric) | 60 in (metric) | 61 in (metric) | 62 in (metric) | 63 in (metric) | 64 in (metric) | 65 in (metric) | 66 in (metric) | 67 in (metric) | 68 in (metric) | 69 in (metric) | 70 in (metric) | 71 in (metric) | 72 in (metric) | 73 in (metric) | 74 in (metric) | 75 in (metric) | 76 in (metric) | 77 in (metric) | 78 in (metric) | 79 in (metric) | 80 in (metric) | 81 in (metric) | 82 in (metric) | 83 in (metric) | 84 in (metric) | 85 in (metric) | 86 in (metric) | 87 in (metric) | 88 in (metric) | 89 in (metric) | 90 in (metric) | 91 in (metric) | 92 in (metric) | 93 in (metric) | 94 in (metric) | 95 in (metric) | 96 in (metric) | 97 in (metric) | 98 in (metric) | 99 in (metric) | 100 in (metric) |
| fathom | 0.0002187 ftm | 0.0004374 ftm | 0.0006562 ftm | 0.0008749 ftm | 0.0010936 ftm | 0.0013123 ftm | 0.0015311 ftm | 0.0017498 ftm | 0.0019685 ftm | 0.0021872 ftm | 0.0024059 ftm | 0.0026247 ftm | 0.0028434 ftm | 0.0030621 ftm | 0.0032808 ftm | 0.0034996 ftm | 0.0037183 ftm | 0.0039370 ftm | 0.0041557 ftm | 0.0043745 ftm | 0.0045932 ftm | 0.0048119 ftm | 0.0050306 ftm | 0.0052493 ftm | 0.0054681 ftm | 0.0056868 ftm | 0.0059055 ftm | 0.0061242 ftm | 0.0063430 ftm | 0.0065617 ftm | 0.0067804 ftm | 0.0069991 ftm | 0.0072178 ftm | 0.0074366 ftm | 0.0076553 ftm | 0.0078740 ftm | 0.0080927 ftm | 0.0083115 ftm | 0.0085302 ftm | 0.0087489 ftm | 0.0089676 ftm | 0.0091864 ftm | 0.0094051 ftm | 0.0096238 ftm | 0.0098425 ftm | 0.0100612 ftm | 0.0102800 ftm | 0.0104987 ftm | 0.0107174 ftm | 0.0109361 ftm | 0.0111549 ftm | 0.0113736 ftm | 0.0115923 ftm | 0.0118110 ftm | 0.0120297 ftm | 0.0122485 ftm | 0.0124672 ftm | 0.0126859 ftm | 0.0129046 ftm | 0.0131234 ftm | 0.0133421 ftm | 0.0135608 ftm | 0.0137795 ftm | 0.0139983 ftm | 0.0142170 ftm | 0.0144357 ftm | 0.0146544 ftm | 0.0148731 ftm | 0.0150919 ftm | 0.0153106 ftm | 0.0155293 ftm | 0.0157480 ftm | 0.0159668 ftm | 0.0161855 ftm | 0.0164042 ftm | 0.0166229 ftm | 0.0168416 ftm | 0.0170604 ftm | 0.0172791 ftm | 0.0174978 ftm | 0.0177165 ftm | 0.0179353 ftm | 0.0181540 ftm | 0.0183727 ftm | 0.0185914 ftm | 0.0188101 ftm | 0.0190289 ftm | 0.0192476 ftm | 0.0194663 ftm | 0.0196850 ftm | 0.0199038 ftm | 0.0201225 ftm | 0.0203412 ftm | 0.0205599 ftm | 0.0207787 ftm | 0.0209974 ftm | 0.0212161 ftm | 0.0214348 ftm | 0.0216535 ftm | 0.0218723 ftm |
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 |
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 |
| metric inches | fathoms |
|---|---|
| 1 | = 0.0002187 |
| 4 572 | = 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 …) |