| foot | 1 ft | 2 ft | 3 ft | 4 ft | 5 ft | 6 ft | 7 ft | 8 ft | 9 ft | 10 ft | 11 ft | 12 ft | 13 ft | 14 ft | 15 ft | 16 ft | 17 ft | 18 ft | 19 ft | 20 ft | 21 ft | 22 ft | 23 ft | 24 ft | 25 ft | 26 ft | 27 ft | 28 ft | 29 ft | 30 ft | 31 ft | 32 ft | 33 ft | 34 ft | 35 ft | 36 ft | 37 ft | 38 ft | 39 ft | 40 ft | 41 ft | 42 ft | 43 ft | 44 ft | 45 ft | 46 ft | 47 ft | 48 ft | 49 ft | 50 ft | 51 ft | 52 ft | 53 ft | 54 ft | 55 ft | 56 ft | 57 ft | 58 ft | 59 ft | 60 ft | 61 ft | 62 ft | 63 ft | 64 ft | 65 ft | 66 ft | 67 ft | 68 ft | 69 ft | 70 ft | 71 ft | 72 ft | 73 ft | 74 ft | 75 ft | 76 ft | 77 ft | 78 ft | 79 ft | 80 ft | 81 ft | 82 ft | 83 ft | 84 ft | 85 ft | 86 ft | 87 ft | 88 ft | 89 ft | 90 ft | 91 ft | 92 ft | 93 ft | 94 ft | 95 ft | 96 ft | 97 ft | 98 ft | 99 ft | 100 ft |
| nail (cloth) | 5.3333333 nail (cloth) | 10.6666667 nail (cloth) | 16 nail (cloth) | 21.3333333 nail (cloth) | 26.6666667 nail (cloth) | 32 nail (cloth) | 37.3333333 nail (cloth) | 42.6666667 nail (cloth) | 48 nail (cloth) | 53.3333333 nail (cloth) | 58.6666667 nail (cloth) | 64 nail (cloth) | 69.3333333 nail (cloth) | 74.6666667 nail (cloth) | 80 nail (cloth) | 85.3333333 nail (cloth) | 90.6666667 nail (cloth) | 96 nail (cloth) | 101.3333333 nail (cloth) | 106.6666667 nail (cloth) | 112 nail (cloth) | 117.3333333 nail (cloth) | 122.6666667 nail (cloth) | 128 nail (cloth) | 133.3333333 nail (cloth) | 138.6666667 nail (cloth) | 144 nail (cloth) | 149.3333333 nail (cloth) | 154.6666667 nail (cloth) | 160 nail (cloth) | 165.3333333 nail (cloth) | 170.6666667 nail (cloth) | 176 nail (cloth) | 181.3333333 nail (cloth) | 186.6666667 nail (cloth) | 192 nail (cloth) | 197.3333333 nail (cloth) | 202.6666667 nail (cloth) | 208 nail (cloth) | 213.3333333 nail (cloth) | 218.6666667 nail (cloth) | 224 nail (cloth) | 229.3333333 nail (cloth) | 234.6666667 nail (cloth) | 240 nail (cloth) | 245.3333333 nail (cloth) | 250.6666667 nail (cloth) | 256 nail (cloth) | 261.3333333 nail (cloth) | 266.6666667 nail (cloth) | 272 nail (cloth) | 277.3333333 nail (cloth) | 282.6666667 nail (cloth) | 288 nail (cloth) | 293.3333333 nail (cloth) | 298.6666667 nail (cloth) | 304 nail (cloth) | 309.3333333 nail (cloth) | 314.6666667 nail (cloth) | 320 nail (cloth) | 325.3333333 nail (cloth) | 330.6666667 nail (cloth) | 336 nail (cloth) | 341.3333333 nail (cloth) | 346.6666667 nail (cloth) | 352 nail (cloth) | 357.3333333 nail (cloth) | 362.6666667 nail (cloth) | 368 nail (cloth) | 373.3333333 nail (cloth) | 378.6666667 nail (cloth) | 384 nail (cloth) | 389.3333333 nail (cloth) | 394.6666667 nail (cloth) | 400 nail (cloth) | 405.3333333 nail (cloth) | 410.6666667 nail (cloth) | 416 nail (cloth) | 421.3333333 nail (cloth) | 426.6666667 nail (cloth) | 432 nail (cloth) | 437.3333333 nail (cloth) | 442.6666667 nail (cloth) | 448 nail (cloth) | 453.3333333 nail (cloth) | 458.6666667 nail (cloth) | 464 nail (cloth) | 469.3333333 nail (cloth) | 474.6666667 nail (cloth) | 480 nail (cloth) | 485.3333333 nail (cloth) | 490.6666667 nail (cloth) | 496 nail (cloth) | 501.3333333 nail (cloth) | 506.6666667 nail (cloth) | 512 nail (cloth) | 517.3333333 nail (cloth) | 522.6666667 nail (cloth) | 528 nail (cloth) | 533.3333333 nail (cloth) |
The foot (pl. feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| foot | ft | ≡ 0.3048 m ≡ 1⁄3 yd ≡ 12 inches | ≡ 0.3048 m | Imperial/US |
| feet | nails (cloth) | feet | nails (cloth) |
|---|---|---|---|
| 1 | = 5.3333333333333 | 4 | = 21.333333333333 |
| 1.5 | = 8 | 4.5 | = 24 |
| 2 | = 10.666666666667 | 5 | = 26.666666666667 |
| 2.5 | = 13.333333333333 | 5.5 | = 29.333333333333 |
| 3 | = 16 | 6 | = 32 |
A nail, as a unit of cloth measurement, is generally a sixteenth of a yard or 2 1/4 inches (5.715 cm). The nail was apparently named after the practice of hammering brass nails into the counter at shops where cloth was sold.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| nail (cloth) | ≡ 2 1⁄4 in | = 0.05715 m | Other (Length) |
| nails (cloth) | feet | nails (cloth) | feet |
|---|---|---|---|
| 1 | = 0.1875 | 4 | = 0.75 |
| 1.5 | = 0.28125 | 4.5 | = 0.84375 |
| 2 | = 0.375 | 5 | = 0.9375 |
| 2.5 | = 0.46875 | 5.5 | = 1.03125 |
| 3 | = 0.5625 | 6 | = 1.125 |
| feet | nails (cloth) |
|---|---|
| 1 | = 5.3333333 |
| 0.1875 | = 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 …) |