french; charriere | 1 F | 2 F | 3 F | 4 F | 5 F | 6 F | 7 F | 8 F | 9 F | 10 F | 11 F | 12 F | 13 F | 14 F | 15 F | 16 F | 17 F | 18 F | 19 F | 20 F | 21 F | 22 F | 23 F | 24 F | 25 F | 26 F | 27 F | 28 F | 29 F | 30 F | 31 F | 32 F | 33 F | 34 F | 35 F | 36 F | 37 F | 38 F | 39 F | 40 F | 41 F | 42 F | 43 F | 44 F | 45 F | 46 F | 47 F | 48 F | 49 F | 50 F | 51 F | 52 F | 53 F | 54 F | 55 F | 56 F | 57 F | 58 F | 59 F | 60 F | 61 F | 62 F | 63 F | 64 F | 65 F | 66 F | 67 F | 68 F | 69 F | 70 F | 71 F | 72 F | 73 F | 74 F | 75 F | 76 F | 77 F | 78 F | 79 F | 80 F | 81 F | 82 F | 83 F | 84 F | 85 F | 86 F | 87 F | 88 F | 89 F | 90 F | 91 F | 92 F | 93 F | 94 F | 95 F | 96 F | 97 F | 98 F | 99 F | 100 F |
span | 0.0014582 span | 0.0029163 span | 0.0043745 span | 0.0058326 span | 0.0072908 span | 0.0087489 span | 0.0102071 span | 0.0116652 span | 0.0131234 span | 0.0145815 span | 0.0160397 span | 0.0174978 span | 0.0189560 span | 0.0204141 span | 0.0218723 span | 0.0233304 span | 0.0247886 span | 0.0262467 span | 0.0277049 span | 0.0291630 span | 0.0306212 span | 0.0320793 span | 0.0335375 span | 0.0349956 span | 0.0364538 span | 0.0379119 span | 0.0393701 span | 0.0408282 span | 0.0422864 span | 0.0437445 span | 0.0452027 span | 0.0466608 span | 0.0481190 span | 0.0495771 span | 0.0510353 span | 0.0524934 span | 0.0539516 span | 0.0554097 span | 0.0568679 span | 0.0583260 span | 0.0597842 span | 0.0612423 span | 0.0627005 span | 0.0641586 span | 0.0656168 span | 0.0670749 span | 0.0685331 span | 0.0699913 span | 0.0714494 span | 0.0729076 span | 0.0743657 span | 0.0758239 span | 0.0772820 span | 0.0787402 span | 0.0801983 span | 0.0816565 span | 0.0831146 span | 0.0845728 span | 0.0860309 span | 0.0874891 span | 0.0889472 span | 0.0904054 span | 0.0918635 span | 0.0933217 span | 0.0947798 span | 0.0962380 span | 0.0976961 span | 0.0991543 span | 0.1006124 span | 0.1020706 span | 0.1035287 span | 0.1049869 span | 0.1064450 span | 0.1079032 span | 0.1093613 span | 0.1108195 span | 0.1122776 span | 0.1137358 span | 0.1151939 span | 0.1166521 span | 0.1181102 span | 0.1195684 span | 0.1210265 span | 0.1224847 span | 0.1239428 span | 0.1254010 span | 0.1268591 span | 0.1283173 span | 0.1297754 span | 0.1312336 span | 0.1326917 span | 0.1341499 span | 0.1356080 span | 0.1370662 span | 0.1385244 span | 0.1399825 span | 0.1414407 span | 0.1428988 span | 0.1443570 span | 0.1458151 span |
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 |
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 |
french; charriere | spans |
---|---|
1 | = 0.0014582 |
685.8 | = 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 …) |