| finger | 1 finger (US) | 2 finger (US) | 3 finger (US) | 4 finger (US) | 5 finger (US) | 6 finger (US) | 7 finger (US) | 8 finger (US) | 9 finger (US) | 10 finger (US) | 11 finger (US) | 12 finger (US) | 13 finger (US) | 14 finger (US) | 15 finger (US) | 16 finger (US) | 17 finger (US) | 18 finger (US) | 19 finger (US) | 20 finger (US) | 21 finger (US) | 22 finger (US) | 23 finger (US) | 24 finger (US) | 25 finger (US) | 26 finger (US) | 27 finger (US) | 28 finger (US) | 29 finger (US) | 30 finger (US) | 31 finger (US) | 32 finger (US) | 33 finger (US) | 34 finger (US) | 35 finger (US) | 36 finger (US) | 37 finger (US) | 38 finger (US) | 39 finger (US) | 40 finger (US) | 41 finger (US) | 42 finger (US) | 43 finger (US) | 44 finger (US) | 45 finger (US) | 46 finger (US) | 47 finger (US) | 48 finger (US) | 49 finger (US) | 50 finger (US) | 51 finger (US) | 52 finger (US) | 53 finger (US) | 54 finger (US) | 55 finger (US) | 56 finger (US) | 57 finger (US) | 58 finger (US) | 59 finger (US) | 60 finger (US) | 61 finger (US) | 62 finger (US) | 63 finger (US) | 64 finger (US) | 65 finger (US) | 66 finger (US) | 67 finger (US) | 68 finger (US) | 69 finger (US) | 70 finger (US) | 71 finger (US) | 72 finger (US) | 73 finger (US) | 74 finger (US) | 75 finger (US) | 76 finger (US) | 77 finger (US) | 78 finger (US) | 79 finger (US) | 80 finger (US) | 81 finger (US) | 82 finger (US) | 83 finger (US) | 84 finger (US) | 85 finger (US) | 86 finger (US) | 87 finger (US) | 88 finger (US) | 89 finger (US) | 90 finger (US) | 91 finger (US) | 92 finger (US) | 93 finger (US) | 94 finger (US) | 95 finger (US) | 96 finger (US) | 97 finger (US) | 98 finger (US) | 99 finger (US) | 100 finger (US) |
| metric inch | 55.5625 in (metric) | 111.125 in (metric) | 166.6875 in (metric) | 222.25 in (metric) | 277.8125 in (metric) | 333.375 in (metric) | 388.9375 in (metric) | 444.5 in (metric) | 500.0625 in (metric) | 555.625 in (metric) | 611.1875 in (metric) | 666.75 in (metric) | 722.3125 in (metric) | 777.875 in (metric) | 833.4375 in (metric) | 889 in (metric) | 944.5625 in (metric) | 1,000.125 in (metric) | 1,055.6875 in (metric) | 1,111.25 in (metric) | 1,166.8125 in (metric) | 1,222.375 in (metric) | 1,277.9375 in (metric) | 1,333.5 in (metric) | 1,389.0625 in (metric) | 1,444.625 in (metric) | 1,500.1875 in (metric) | 1,555.75 in (metric) | 1,611.3125 in (metric) | 1,666.875 in (metric) | 1,722.4375 in (metric) | 1 778 in (metric) | 1,833.5625 in (metric) | 1,889.125 in (metric) | 1,944.6875 in (metric) | 2,000.25 in (metric) | 2,055.8125 in (metric) | 2,111.375 in (metric) | 2,166.9375 in (metric) | 2,222.5 in (metric) | 2,278.0625 in (metric) | 2,333.625 in (metric) | 2,389.1875 in (metric) | 2,444.75 in (metric) | 2,500.3125 in (metric) | 2,555.875 in (metric) | 2,611.4375 in (metric) | 2 667 in (metric) | 2,722.5625 in (metric) | 2,778.125 in (metric) | 2,833.6875 in (metric) | 2,889.25 in (metric) | 2,944.8125 in (metric) | 3,000.375 in (metric) | 3,055.9375 in (metric) | 3,111.5 in (metric) | 3,167.0625 in (metric) | 3,222.625 in (metric) | 3,278.1875 in (metric) | 3,333.75 in (metric) | 3,389.3125 in (metric) | 3,444.875 in (metric) | 3,500.4375 in (metric) | 3 556 in (metric) | 3,611.5625 in (metric) | 3,667.125 in (metric) | 3,722.6875 in (metric) | 3,778.25 in (metric) | 3,833.8125 in (metric) | 3,889.375 in (metric) | 3,944.9375 in (metric) | 4,000.5 in (metric) | 4,056.0625 in (metric) | 4,111.625 in (metric) | 4,167.1875 in (metric) | 4,222.75 in (metric) | 4,278.3125 in (metric) | 4,333.875 in (metric) | 4,389.4375 in (metric) | 4 445 in (metric) | 4,500.5625 in (metric) | 4,556.125 in (metric) | 4,611.6875 in (metric) | 4,667.25 in (metric) | 4,722.8125 in (metric) | 4,778.375 in (metric) | 4,833.9375 in (metric) | 4,889.5 in (metric) | 4,945.0625 in (metric) | 5,000.625 in (metric) | 5,056.1875 in (metric) | 5,111.75 in (metric) | 5,167.3125 in (metric) | 5,222.875 in (metric) | 5,278.4375 in (metric) | 5 334 in (metric) | 5,389.5625 in (metric) | 5,445.125 in (metric) | 5,500.6875 in (metric) | 5,556.25 in (metric) |
A finger (sometimes fingerbreadth or finger's breadth) is any of several units of measurement that are approximately the width of an adult human finger, including:
The digit, also known as digitus or digitus transversus (Latin), dactyl (Greek) or dactylus, or finger's breadth — 3⁄4 of an inch or 1⁄16 of a foot.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| finger | finger (US) | ≡ 7⁄8 in | = 0.022225 m | Imperial/US |
| finger | metric inches | finger | metric inches |
|---|---|---|---|
| 1 | = 55.5625 | 4 | = 222.25 |
| 1.5 | = 83.34375 | 4.5 | = 250.03125 |
| 2 | = 111.125 | 5 | = 277.8125 |
| 2.5 | = 138.90625 | 5.5 | = 305.59375 |
| 3 | = 166.6875 | 6 | = 333.375 |
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 | finger | metric inches | finger |
|---|---|---|---|
| 1 | = 0.017997750281215 | 4 | = 0.071991001124859 |
| 1.5 | = 0.026996625421822 | 4.5 | = 0.080989876265467 |
| 2 | = 0.03599550056243 | 5 | = 0.089988751406074 |
| 2.5 | = 0.044994375703037 | 5.5 | = 0.098987626546682 |
| 3 | = 0.053993250843645 | 6 | = 0.10798650168729 |
| finger | metric inches |
|---|---|
| 1 | = 55.5625 |
| 0.0179978 | = 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 …) |