span | 1 span | 2 span | 3 span | 4 span | 5 span | 6 span | 7 span | 8 span | 9 span | 10 span | 11 span | 12 span | 13 span | 14 span | 15 span | 16 span | 17 span | 18 span | 19 span | 20 span | 21 span | 22 span | 23 span | 24 span | 25 span | 26 span | 27 span | 28 span | 29 span | 30 span | 31 span | 32 span | 33 span | 34 span | 35 span | 36 span | 37 span | 38 span | 39 span | 40 span | 41 span | 42 span | 43 span | 44 span | 45 span | 46 span | 47 span | 48 span | 49 span | 50 span | 51 span | 52 span | 53 span | 54 span | 55 span | 56 span | 57 span | 58 span | 59 span | 60 span | 61 span | 62 span | 63 span | 64 span | 65 span | 66 span | 67 span | 68 span | 69 span | 70 span | 71 span | 72 span | 73 span | 74 span | 75 span | 76 span | 77 span | 78 span | 79 span | 80 span | 81 span | 82 span | 83 span | 84 span | 85 span | 86 span | 87 span | 88 span | 89 span | 90 span | 91 span | 92 span | 93 span | 94 span | 95 span | 96 span | 97 span | 98 span | 99 span | 100 span |
french; charriere | 685.8 F | 1,371.6 F | 2,057.4 F | 2,743.2 F | 3 429 F | 4,114.8 F | 4,800.6 F | 5,486.4 F | 6,172.2 F | 6 858 F | 7,543.8 F | 8,229.6 F | 8,915.4 F | 9,601.2 F | 10 287 F | 10,972.8 F | 11,658.6 F | 12,344.4 F | 13,030.2 F | 13 716 F | 14,401.8 F | 15,087.6 F | 15,773.4 F | 16,459.2 F | 17 145 F | 17,830.8 F | 18,516.6 F | 19,202.4 F | 19,888.2 F | 20 574 F | 21,259.8 F | 21,945.6 F | 22,631.4 F | 23,317.2 F | 24 003 F | 24,688.8 F | 25,374.6 F | 26,060.4 F | 26,746.2 F | 27 432 F | 28,117.8 F | 28,803.6 F | 29,489.4 F | 30,175.2 F | 30 861 F | 31,546.8 F | 32,232.6 F | 32,918.4 F | 33,604.2 F | 34 290 F | 34,975.8 F | 35,661.6 F | 36,347.4 F | 37,033.2 F | 37 719 F | 38,404.8 F | 39,090.6 F | 39,776.4 F | 40,462.2 F | 41 148 F | 41,833.8 F | 42,519.6 F | 43,205.4 F | 43,891.2 F | 44 577 F | 45,262.8 F | 45,948.6 F | 46,634.4 F | 47,320.2 F | 48 006 F | 48,691.8 F | 49,377.6 F | 50,063.4 F | 50,749.2 F | 51 435 F | 52,120.8 F | 52,806.6 F | 53,492.4 F | 54,178.2 F | 54 864 F | 55,549.8 F | 56,235.6 F | 56,921.4 F | 57,607.2 F | 58 293 F | 58,978.8 F | 59,664.6 F | 60,350.4 F | 61,036.2 F | 61 722 F | 62,407.8 F | 63,093.6 F | 63,779.4 F | 64,465.2 F | 65 151 F | 65,836.8 F | 66,522.6 F | 67,208.4 F | 67,894.2 F | 68 580 F |
A span is the distance measured by a human hand, from the tip of the thumb to the tip of the little finger. In ancient times, a span was considered to be half a cubit. Sometimes the distinction is made between the great span (thumb to little finger) and little span (index finger to little finger).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
span | span | ≡ 9 in | = 0.2286 m | Imperial/US |
spans | french; charriere | spans | french; charriere |
---|---|---|---|
1 | = 685.8 | 4 | = 2743.2 |
1.5 | = 1028.7 | 4.5 | = 3086.1 |
2 | = 1371.6 | 5 | = 3429 |
2.5 | = 1714.5 | 5.5 | = 3771.9 |
3 | = 2057.4 | 6 | = 4114.8 |
The French scale or French gauge system is commonly used to measure the size of a catheter. It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, Ga, FR or F. It may also be abbreviated as CH or Ch (for Charrière, its inventor).
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
french; charriere | F | ≡ 1⁄3 mm | = 0.3×10−3 m | Other (Length) |
french; charriere | spans | french; charriere | spans |
---|---|---|---|
1 | = 0.0014581510644503 | 4 | = 0.0058326042578011 |
1.5 | = 0.0021872265966754 | 4.5 | = 0.0065616797900262 |
2 | = 0.0029163021289006 | 5 | = 0.0072907553222514 |
2.5 | = 0.0036453776611257 | 5.5 | = 0.0080198308544765 |
3 | = 0.0043744531933508 | 6 | = 0.0087489063867017 |
spans | french; charriere |
---|---|
1 | = 685.8 |
0.0014582 | = 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 …) |