| 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 |
| metric inch | 63.5 in (metric) | 127 in (metric) | 190.5 in (metric) | 254 in (metric) | 317.5 in (metric) | 381 in (metric) | 444.5 in (metric) | 508 in (metric) | 571.5 in (metric) | 635 in (metric) | 698.5 in (metric) | 762 in (metric) | 825.5 in (metric) | 889 in (metric) | 952.5 in (metric) | 1 016 in (metric) | 1,079.5 in (metric) | 1 143 in (metric) | 1,206.5 in (metric) | 1 270 in (metric) | 1,333.5 in (metric) | 1 397 in (metric) | 1,460.5 in (metric) | 1 524 in (metric) | 1,587.5 in (metric) | 1 651 in (metric) | 1,714.5 in (metric) | 1 778 in (metric) | 1,841.5 in (metric) | 1 905 in (metric) | 1,968.5 in (metric) | 2 032 in (metric) | 2,095.5 in (metric) | 2 159 in (metric) | 2,222.5 in (metric) | 2 286 in (metric) | 2,349.5 in (metric) | 2 413 in (metric) | 2,476.5 in (metric) | 2 540 in (metric) | 2,603.5 in (metric) | 2 667 in (metric) | 2,730.5 in (metric) | 2 794 in (metric) | 2,857.5 in (metric) | 2 921 in (metric) | 2,984.5 in (metric) | 3 048 in (metric) | 3,111.5 in (metric) | 3 175 in (metric) | 3,238.5 in (metric) | 3 302 in (metric) | 3,365.5 in (metric) | 3 429 in (metric) | 3,492.5 in (metric) | 3 556 in (metric) | 3,619.5 in (metric) | 3 683 in (metric) | 3,746.5 in (metric) | 3 810 in (metric) | 3,873.5 in (metric) | 3 937 in (metric) | 4,000.5 in (metric) | 4 064 in (metric) | 4,127.5 in (metric) | 4 191 in (metric) | 4,254.5 in (metric) | 4 318 in (metric) | 4,381.5 in (metric) | 4 445 in (metric) | 4,508.5 in (metric) | 4 572 in (metric) | 4,635.5 in (metric) | 4 699 in (metric) | 4,762.5 in (metric) | 4 826 in (metric) | 4,889.5 in (metric) | 4 953 in (metric) | 5,016.5 in (metric) | 5 080 in (metric) | 5,143.5 in (metric) | 5 207 in (metric) | 5,270.5 in (metric) | 5 334 in (metric) | 5,397.5 in (metric) | 5 461 in (metric) | 5,524.5 in (metric) | 5 588 in (metric) | 5,651.5 in (metric) | 5 715 in (metric) | 5,778.5 in (metric) | 5 842 in (metric) | 5,905.5 in (metric) | 5 969 in (metric) | 6,032.5 in (metric) | 6 096 in (metric) | 6,159.5 in (metric) | 6 223 in (metric) | 6,286.5 in (metric) | 6 350 in (metric) |
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 | metric inches | inches | metric inches |
|---|---|---|---|
| 1 | = 63.5 | 4 | = 254 |
| 1.5 | = 95.25 | 4.5 | = 285.75 |
| 2 | = 127 | 5 | = 317.5 |
| 2.5 | = 158.75 | 5.5 | = 349.25 |
| 3 | = 190.5 | 6 | = 381 |
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 | inches | metric inches | inches |
|---|---|---|---|
| 1 | = 0.015748031496063 | 4 | = 0.062992125984252 |
| 1.5 | = 0.023622047244094 | 4.5 | = 0.070866141732283 |
| 2 | = 0.031496062992126 | 5 | = 0.078740157480315 |
| 2.5 | = 0.039370078740157 | 5.5 | = 0.086614173228346 |
| 3 | = 0.047244094488189 | 6 | = 0.094488188976378 |
| inches | metric inches |
|---|---|
| 1 | = 63.5 |
| 0.0157480 | = 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 …) |