| 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 |
| link | 0.0016570 lnk | 0.0033140 lnk | 0.0049710 lnk | 0.0066279 lnk | 0.0082849 lnk | 0.0099419 lnk | 0.0115989 lnk | 0.0132559 lnk | 0.0149129 lnk | 0.0165699 lnk | 0.0182269 lnk | 0.0198838 lnk | 0.0215408 lnk | 0.0231978 lnk | 0.0248548 lnk | 0.0265118 lnk | 0.0281688 lnk | 0.0298258 lnk | 0.0314827 lnk | 0.0331397 lnk | 0.0347967 lnk | 0.0364537 lnk | 0.0381107 lnk | 0.0397677 lnk | 0.0414247 lnk | 0.0430817 lnk | 0.0447386 lnk | 0.0463956 lnk | 0.0480526 lnk | 0.0497096 lnk | 0.0513666 lnk | 0.0530236 lnk | 0.0546806 lnk | 0.0563375 lnk | 0.0579945 lnk | 0.0596515 lnk | 0.0613085 lnk | 0.0629655 lnk | 0.0646225 lnk | 0.0662795 lnk | 0.0679364 lnk | 0.0695934 lnk | 0.0712504 lnk | 0.0729074 lnk | 0.0745644 lnk | 0.0762214 lnk | 0.0778784 lnk | 0.0795354 lnk | 0.0811923 lnk | 0.0828493 lnk | 0.0845063 lnk | 0.0861633 lnk | 0.0878203 lnk | 0.0894773 lnk | 0.0911343 lnk | 0.0927912 lnk | 0.0944482 lnk | 0.0961052 lnk | 0.0977622 lnk | 0.0994192 lnk | 0.1010762 lnk | 0.1027332 lnk | 0.1043902 lnk | 0.1060471 lnk | 0.1077041 lnk | 0.1093611 lnk | 0.1110181 lnk | 0.1126751 lnk | 0.1143321 lnk | 0.1159891 lnk | 0.1176460 lnk | 0.1193030 lnk | 0.1209600 lnk | 0.1226170 lnk | 0.1242740 lnk | 0.1259310 lnk | 0.1275880 lnk | 0.1292450 lnk | 0.1309019 lnk | 0.1325589 lnk | 0.1342159 lnk | 0.1358729 lnk | 0.1375299 lnk | 0.1391869 lnk | 0.1408439 lnk | 0.1425008 lnk | 0.1441578 lnk | 0.1458148 lnk | 0.1474718 lnk | 0.1491288 lnk | 0.1507858 lnk | 0.1524428 lnk | 0.1540997 lnk | 0.1557567 lnk | 0.1574137 lnk | 0.1590707 lnk | 0.1607277 lnk | 0.1623847 lnk | 0.1640417 lnk | 0.1656987 lnk |
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 | links | french; charriere | links |
|---|---|---|---|
| 1 | ≈ 0.0016569865512344 | 4 | ≈ 0.0066279462049374 |
| 1.5 | ≈ 0.0024854798268515 | 4.5 | ≈ 0.0074564394805546 |
| 2 | ≈ 0.0033139731024687 | 5 | ≈ 0.0082849327561718 |
| 2.5 | ≈ 0.0041424663780859 | 5.5 | ≈ 0.009113426031789 |
| 3 | ≈ 0.0049709596537031 | 6 | ≈ 0.0099419193074061 |
The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. A link is exactly 66⁄100 of a foot, or exactly 7.92 inches or 20.1168 cm.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| link | lnk | ≡ 1⁄100 ch ≡ 0.66 ft (US) ≡ 7.92 in | ≈ 0.2011684 m | Imperial/US |
| links | french; charriere | links | french; charriere |
|---|---|---|---|
| 1 | ≈ 603.5052 | 4 | ≈ 2414.0208 |
| 1.5 | ≈ 905.2578 | 4.5 | ≈ 2715.7734 |
| 2 | ≈ 1207.0104 | 5 | ≈ 3017.526 |
| 2.5 | ≈ 1508.763 | 5.5 | ≈ 3319.2786 |
| 3 | ≈ 1810.5156 | 6 | ≈ 3621.0312 |
| french; charriere | links |
|---|---|
| 1 | ≈ 0.0016570 |
| 603.5052 | ≈ 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 …) |