| 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 |
| finger (cloth) | 0.0029163 finger (cloth) | 0.0058326 finger (cloth) | 0.0087489 finger (cloth) | 0.0116652 finger (cloth) | 0.0145815 finger (cloth) | 0.0174978 finger (cloth) | 0.0204141 finger (cloth) | 0.0233304 finger (cloth) | 0.0262467 finger (cloth) | 0.0291630 finger (cloth) | 0.0320793 finger (cloth) | 0.0349956 finger (cloth) | 0.0379119 finger (cloth) | 0.0408282 finger (cloth) | 0.0437445 finger (cloth) | 0.0466608 finger (cloth) | 0.0495771 finger (cloth) | 0.0524934 finger (cloth) | 0.0554097 finger (cloth) | 0.0583260 finger (cloth) | 0.0612423 finger (cloth) | 0.0641586 finger (cloth) | 0.0670749 finger (cloth) | 0.0699913 finger (cloth) | 0.0729076 finger (cloth) | 0.0758239 finger (cloth) | 0.0787402 finger (cloth) | 0.0816565 finger (cloth) | 0.0845728 finger (cloth) | 0.0874891 finger (cloth) | 0.0904054 finger (cloth) | 0.0933217 finger (cloth) | 0.0962380 finger (cloth) | 0.0991543 finger (cloth) | 0.1020706 finger (cloth) | 0.1049869 finger (cloth) | 0.1079032 finger (cloth) | 0.1108195 finger (cloth) | 0.1137358 finger (cloth) | 0.1166521 finger (cloth) | 0.1195684 finger (cloth) | 0.1224847 finger (cloth) | 0.1254010 finger (cloth) | 0.1283173 finger (cloth) | 0.1312336 finger (cloth) | 0.1341499 finger (cloth) | 0.1370662 finger (cloth) | 0.1399825 finger (cloth) | 0.1428988 finger (cloth) | 0.1458151 finger (cloth) | 0.1487314 finger (cloth) | 0.1516477 finger (cloth) | 0.1545640 finger (cloth) | 0.1574803 finger (cloth) | 0.1603966 finger (cloth) | 0.1633129 finger (cloth) | 0.1662292 finger (cloth) | 0.1691455 finger (cloth) | 0.1720618 finger (cloth) | 0.1749781 finger (cloth) | 0.1778944 finger (cloth) | 0.1808107 finger (cloth) | 0.1837270 finger (cloth) | 0.1866433 finger (cloth) | 0.1895596 finger (cloth) | 0.1924759 finger (cloth) | 0.1953922 finger (cloth) | 0.1983085 finger (cloth) | 0.2012248 finger (cloth) | 0.2041411 finger (cloth) | 0.2070575 finger (cloth) | 0.2099738 finger (cloth) | 0.2128901 finger (cloth) | 0.2158064 finger (cloth) | 0.2187227 finger (cloth) | 0.2216390 finger (cloth) | 0.2245553 finger (cloth) | 0.2274716 finger (cloth) | 0.2303879 finger (cloth) | 0.2333042 finger (cloth) | 0.2362205 finger (cloth) | 0.2391368 finger (cloth) | 0.2420531 finger (cloth) | 0.2449694 finger (cloth) | 0.2478857 finger (cloth) | 0.2508020 finger (cloth) | 0.2537183 finger (cloth) | 0.2566346 finger (cloth) | 0.2595509 finger (cloth) | 0.2624672 finger (cloth) | 0.2653835 finger (cloth) | 0.2682998 finger (cloth) | 0.2712161 finger (cloth) | 0.2741324 finger (cloth) | 0.2770487 finger (cloth) | 0.2799650 finger (cloth) | 0.2828813 finger (cloth) | 0.2857976 finger (cloth) | 0.2887139 finger (cloth) | 0.2916302 finger (cloth) |
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 | finger (cloth) | french; charriere | finger (cloth) |
|---|---|---|---|
| 1 | = 0.0029163021289006 | 4 | = 0.011665208515602 |
| 1.5 | = 0.0043744531933508 | 4.5 | = 0.013123359580052 |
| 2 | = 0.0058326042578011 | 5 | = 0.014581510644503 |
| 2.5 | = 0.0072907553222514 | 5.5 | = 0.016039661708953 |
| 3 | = 0.0087489063867017 | 6 | = 0.017497812773403 |
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 (cloth) | ≡ 4 ⁄12 in | = 0.1143 m | Other (Length) |
| finger (cloth) | french; charriere | finger (cloth) | french; charriere |
|---|---|---|---|
| 1 | = 342.9 | 4 | = 1371.6 |
| 1.5 | = 514.35 | 4.5 | = 1543.05 |
| 2 | = 685.8 | 5 | = 1714.5 |
| 2.5 | = 857.25 | 5.5 | = 1885.95 |
| 3 | = 1028.7 | 6 | = 2057.4 |
| french; charriere | finger (cloth) |
|---|---|
| 1 | = 0.0029163 |
| 342.9 | = 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 …) |