| 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) |
| inch | 0.0157480 in | 0.0314961 in | 0.0472441 in | 0.0629921 in | 0.0787402 in | 0.0944882 in | 0.1102362 in | 0.1259843 in | 0.1417323 in | 0.1574803 in | 0.1732283 in | 0.1889764 in | 0.2047244 in | 0.2204724 in | 0.2362205 in | 0.2519685 in | 0.2677165 in | 0.2834646 in | 0.2992126 in | 0.3149606 in | 0.3307087 in | 0.3464567 in | 0.3622047 in | 0.3779528 in | 0.3937008 in | 0.4094488 in | 0.4251969 in | 0.4409449 in | 0.4566929 in | 0.4724409 in | 0.4881890 in | 0.5039370 in | 0.5196850 in | 0.5354331 in | 0.5511811 in | 0.5669291 in | 0.5826772 in | 0.5984252 in | 0.6141732 in | 0.6299213 in | 0.6456693 in | 0.6614173 in | 0.6771654 in | 0.6929134 in | 0.7086614 in | 0.7244094 in | 0.7401575 in | 0.7559055 in | 0.7716535 in | 0.7874016 in | 0.8031496 in | 0.8188976 in | 0.8346457 in | 0.8503937 in | 0.8661417 in | 0.8818898 in | 0.8976378 in | 0.9133858 in | 0.9291339 in | 0.9448819 in | 0.9606299 in | 0.9763780 in | 0.9921260 in | 1.0078740 in | 1.0236220 in | 1.0393701 in | 1.0551181 in | 1.0708661 in | 1.0866142 in | 1.1023622 in | 1.1181102 in | 1.1338583 in | 1.1496063 in | 1.1653543 in | 1.1811024 in | 1.1968504 in | 1.2125984 in | 1.2283465 in | 1.2440945 in | 1.2598425 in | 1.2755906 in | 1.2913386 in | 1.3070866 in | 1.3228346 in | 1.3385827 in | 1.3543307 in | 1.3700787 in | 1.3858268 in | 1.4015748 in | 1.4173228 in | 1.4330709 in | 1.4488189 in | 1.4645669 in | 1.4803150 in | 1.4960630 in | 1.5118110 in | 1.5275591 in | 1.5433071 in | 1.5590551 in | 1.5748031 in |
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 |
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 |
| metric inches | inches |
|---|---|
| 1 | = 0.0157480 |
| 63.5 | = 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 …) |