| thou | 1 th | 2 th | 3 th | 4 th | 5 th | 6 th | 7 th | 8 th | 9 th | 10 th | 11 th | 12 th | 13 th | 14 th | 15 th | 16 th | 17 th | 18 th | 19 th | 20 th | 21 th | 22 th | 23 th | 24 th | 25 th | 26 th | 27 th | 28 th | 29 th | 30 th | 31 th | 32 th | 33 th | 34 th | 35 th | 36 th | 37 th | 38 th | 39 th | 40 th | 41 th | 42 th | 43 th | 44 th | 45 th | 46 th | 47 th | 48 th | 49 th | 50 th | 51 th | 52 th | 53 th | 54 th | 55 th | 56 th | 57 th | 58 th | 59 th | 60 th | 61 th | 62 th | 63 th | 64 th | 65 th | 66 th | 67 th | 68 th | 69 th | 70 th | 71 th | 72 th | 73 th | 74 th | 75 th | 76 th | 77 th | 78 th | 79 th | 80 th | 81 th | 82 th | 83 th | 84 th | 85 th | 86 th | 87 th | 88 th | 89 th | 90 th | 91 th | 92 th | 93 th | 94 th | 95 th | 96 th | 97 th | 98 th | 99 th | 100 th |
| foot | 8.3333333333333 × 10-5 ft | 0.0001667 ft | 0.00025 ft | 0.0003333 ft | 0.0004167 ft | 0.0005 ft | 0.0005833 ft | 0.0006667 ft | 0.00075 ft | 0.0008333 ft | 0.0009167 ft | 0.001 ft | 0.0010833 ft | 0.0011667 ft | 0.00125 ft | 0.0013333 ft | 0.0014167 ft | 0.0015 ft | 0.0015833 ft | 0.0016667 ft | 0.00175 ft | 0.0018333 ft | 0.0019167 ft | 0.002 ft | 0.0020833 ft | 0.0021667 ft | 0.00225 ft | 0.0023333 ft | 0.0024167 ft | 0.0025 ft | 0.0025833 ft | 0.0026667 ft | 0.00275 ft | 0.0028333 ft | 0.0029167 ft | 0.003 ft | 0.0030833 ft | 0.0031667 ft | 0.00325 ft | 0.0033333 ft | 0.0034167 ft | 0.0035 ft | 0.0035833 ft | 0.0036667 ft | 0.00375 ft | 0.0038333 ft | 0.0039167 ft | 0.004 ft | 0.0040833 ft | 0.0041667 ft | 0.00425 ft | 0.0043333 ft | 0.0044167 ft | 0.0045 ft | 0.0045833 ft | 0.0046667 ft | 0.00475 ft | 0.0048333 ft | 0.0049167 ft | 0.005 ft | 0.0050833 ft | 0.0051667 ft | 0.00525 ft | 0.0053333 ft | 0.0054167 ft | 0.0055 ft | 0.0055833 ft | 0.0056667 ft | 0.00575 ft | 0.0058333 ft | 0.0059167 ft | 0.006 ft | 0.0060833 ft | 0.0061667 ft | 0.00625 ft | 0.0063333 ft | 0.0064167 ft | 0.0065 ft | 0.0065833 ft | 0.0066667 ft | 0.00675 ft | 0.0068333 ft | 0.0069167 ft | 0.007 ft | 0.0070833 ft | 0.0071667 ft | 0.00725 ft | 0.0073333 ft | 0.0074167 ft | 0.0075 ft | 0.0075833 ft | 0.0076667 ft | 0.00775 ft | 0.0078333 ft | 0.0079167 ft | 0.008 ft | 0.0080833 ft | 0.0081667 ft | 0.00825 ft | 0.0083333 ft |
A thousandth of an inch is a derived unit of length in an inch-based system of units. Equal to 0.001 inches, it is normally referred to as a thou /ˈθaʊ/, a thousandth, or (particularly in the United States) a mil.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| thou | th | ≡ 1×10−3 in | ≡ 2.54×10−5 m | Imperial/US |
| thous | feet | thous | feet |
|---|---|---|---|
| 1 | ≡ 8.3333333333333E-5 | 4 | ≡ 0.00033333333333333 |
| 1.5 | ≡ 0.000125 | 4.5 | ≡ 0.000375 |
| 2 | ≡ 0.00016666666666667 | 5 | ≡ 0.00041666666666667 |
| 2.5 | ≡ 0.00020833333333333 | 5.5 | ≡ 0.00045833333333333 |
| 3 | ≡ 0.00025 | 6 | ≡ 0.0005 |
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 | thous | feet | thous |
|---|---|---|---|
| 1 | ≡ 12000 | 4 | ≡ 48000 |
| 1.5 | ≡ 18000 | 4.5 | ≡ 54000 |
| 2 | ≡ 24000 | 5 | ≡ 60000 |
| 2.5 | ≡ 30000 | 5.5 | ≡ 66000 |
| 3 | ≡ 36000 | 6 | ≡ 72000 |
| thous | feet |
|---|---|
| 1 | ≡ 8.3333333333333 × 10-5 |
| 12 000 | ≡ 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 …) |