| inch | 1 in | 2 in | 3 in | 4 in | 5 in | 6 in | 7 in | 8 in | 9 in | 10 in | 11 in | 12 in | 13 in | 14 in | 15 in | 16 in | 17 in | 18 in | 19 in | 20 in | 21 in | 22 in | 23 in | 24 in | 25 in | 26 in | 27 in | 28 in | 29 in | 30 in | 31 in | 32 in | 33 in | 34 in | 35 in | 36 in | 37 in | 38 in | 39 in | 40 in | 41 in | 42 in | 43 in | 44 in | 45 in | 46 in | 47 in | 48 in | 49 in | 50 in | 51 in | 52 in | 53 in | 54 in | 55 in | 56 in | 57 in | 58 in | 59 in | 60 in | 61 in | 62 in | 63 in | 64 in | 65 in | 66 in | 67 in | 68 in | 69 in | 70 in | 71 in | 72 in | 73 in | 74 in | 75 in | 76 in | 77 in | 78 in | 79 in | 80 in | 81 in | 82 in | 83 in | 84 in | 85 in | 86 in | 87 in | 88 in | 89 in | 90 in | 91 in | 92 in | 93 in | 94 in | 95 in | 96 in | 97 in | 98 in | 99 in | 100 in |
| line | 12 ln | 24 ln | 36 ln | 48 ln | 60 ln | 72 ln | 84 ln | 96 ln | 108 ln | 120 ln | 132 ln | 144 ln | 156 ln | 168 ln | 180 ln | 192 ln | 204 ln | 216 ln | 228 ln | 240 ln | 252 ln | 264 ln | 276 ln | 288 ln | 300 ln | 312 ln | 324 ln | 336 ln | 348 ln | 360 ln | 372 ln | 384 ln | 396 ln | 408 ln | 420 ln | 432 ln | 444 ln | 456 ln | 468 ln | 480 ln | 492 ln | 504 ln | 516 ln | 528 ln | 540 ln | 552 ln | 564 ln | 576 ln | 588 ln | 600 ln | 612 ln | 624 ln | 636 ln | 648 ln | 660 ln | 672 ln | 684 ln | 696 ln | 708 ln | 720 ln | 732 ln | 744 ln | 756 ln | 768 ln | 780 ln | 792 ln | 804 ln | 816 ln | 828 ln | 840 ln | 852 ln | 864 ln | 876 ln | 888 ln | 900 ln | 912 ln | 924 ln | 936 ln | 948 ln | 960 ln | 972 ln | 984 ln | 996 ln | 1 008 ln | 1 020 ln | 1 032 ln | 1 044 ln | 1 056 ln | 1 068 ln | 1 080 ln | 1 092 ln | 1 104 ln | 1 116 ln | 1 128 ln | 1 140 ln | 1 152 ln | 1 164 ln | 1 176 ln | 1 188 ln | 1 200 ln |
The inch (abbreviation: in or ″) is a unit of length in the (British) imperial and United States customary systems of measurement now formally equal to 1⁄36 yard but usually understood as 1⁄12 of a foot. Derived from the Roman uncia ("twelfth"), inch is also sometimes used to translate related units in other measurement systems, usually understood as deriving from the width of the human thumb.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| inch | in | ≡ 2.54 cm ≡ 1⁄36 yd ≡ 1⁄12 ft | ≡ 0.0254 m | Imperial/US |
| inches | lines | inches | lines |
|---|---|---|---|
| 1 | = 12 | 4 | = 48 |
| 1.5 | = 18 | 4.5 | = 54 |
| 2 | = 24 | 5 | = 60 |
| 2.5 | = 30 | 5.5 | = 66 |
| 3 | = 36 | 6 | = 72 |
The line (abbreviated L or l) was a small English unit of length, variously reckoned as 1⁄10, 1⁄12, 1⁄16, or 1⁄40 of an inch. It was not included among the units authorized as the British Imperial system in 1824.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| line | ln | ≡ 1⁄12 in | = 0.002116 m | Imperial/US |
| lines | inches | lines | inches |
|---|---|---|---|
| 1 | = 0.083333333333333 | 4 | = 0.33333333333333 |
| 1.5 | = 0.125 | 4.5 | = 0.375 |
| 2 | = 0.16666666666667 | 5 | = 0.41666666666667 |
| 2.5 | = 0.20833333333333 | 5.5 | = 0.45833333333333 |
| 3 | = 0.25 | 6 | = 0.5 |
| inches | lines |
|---|---|
| 1 | = 12 |
| 0.0833333 | = 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 …) |