| 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 |
| line | 0.1574803 ln | 0.3149606 ln | 0.4724409 ln | 0.6299213 ln | 0.7874016 ln | 0.9448819 ln | 1.1023622 ln | 1.2598425 ln | 1.4173228 ln | 1.5748031 ln | 1.7322835 ln | 1.8897638 ln | 2.0472441 ln | 2.2047244 ln | 2.3622047 ln | 2.5196850 ln | 2.6771654 ln | 2.8346457 ln | 2.9921260 ln | 3.1496063 ln | 3.3070866 ln | 3.4645669 ln | 3.6220472 ln | 3.7795276 ln | 3.9370079 ln | 4.0944882 ln | 4.2519685 ln | 4.4094488 ln | 4.5669291 ln | 4.7244094 ln | 4.8818898 ln | 5.0393701 ln | 5.1968504 ln | 5.3543307 ln | 5.5118110 ln | 5.6692913 ln | 5.8267717 ln | 5.9842520 ln | 6.1417323 ln | 6.2992126 ln | 6.4566929 ln | 6.6141732 ln | 6.7716535 ln | 6.9291339 ln | 7.0866142 ln | 7.2440945 ln | 7.4015748 ln | 7.5590551 ln | 7.7165354 ln | 7.8740157 ln | 8.0314961 ln | 8.1889764 ln | 8.3464567 ln | 8.5039370 ln | 8.6614173 ln | 8.8188976 ln | 8.9763780 ln | 9.1338583 ln | 9.2913386 ln | 9.4488189 ln | 9.6062992 ln | 9.7637795 ln | 9.9212598 ln | 10.0787402 ln | 10.2362205 ln | 10.3937008 ln | 10.5511811 ln | 10.7086614 ln | 10.8661417 ln | 11.0236220 ln | 11.1811024 ln | 11.3385827 ln | 11.4960630 ln | 11.6535433 ln | 11.8110236 ln | 11.9685039 ln | 12.1259843 ln | 12.2834646 ln | 12.4409449 ln | 12.5984252 ln | 12.7559055 ln | 12.9133858 ln | 13.0708661 ln | 13.2283465 ln | 13.3858268 ln | 13.5433071 ln | 13.7007874 ln | 13.8582677 ln | 14.0157480 ln | 14.1732283 ln | 14.3307087 ln | 14.4881890 ln | 14.6456693 ln | 14.8031496 ln | 14.9606299 ln | 15.1181102 ln | 15.2755906 ln | 15.4330709 ln | 15.5905512 ln | 15.7480315 ln |
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 | lines | french; charriere | lines |
|---|---|---|---|
| 1 | = 0.15748031496063 | 4 | = 0.62992125984252 |
| 1.5 | = 0.23622047244094 | 4.5 | = 0.70866141732283 |
| 2 | = 0.31496062992126 | 5 | = 0.78740157480315 |
| 2.5 | = 0.39370078740157 | 5.5 | = 0.86614173228346 |
| 3 | = 0.47244094488189 | 6 | = 0.94488188976378 |
The line (abbreviated L or l) was a small English unit of length, variously reckoned as 1⁄10, 1⁄12, 1⁄16, or 1⁄40 of an inch. It was not included among the units authorized as the British Imperial system in 1824.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| line | ln | ≡ 1⁄12 in | = 0.002116 m | Imperial/US |
| lines | french; charriere | lines | french; charriere |
|---|---|---|---|
| 1 | = 6.35 | 4 | = 25.4 |
| 1.5 | = 9.525 | 4.5 | = 28.575 |
| 2 | = 12.7 | 5 | = 31.75 |
| 2.5 | = 15.875 | 5.5 | = 34.925 |
| 3 | = 19.05 | 6 | = 38.1 |
| french; charriere | lines |
|---|---|
| 1 | = 0.1574803 |
| 6.35 | = 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 …) |