| 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 |
| ell | 0.0002916 ell | 0.0005833 ell | 0.0008749 ell | 0.0011665 ell | 0.0014582 ell | 0.0017498 ell | 0.0020414 ell | 0.0023330 ell | 0.0026247 ell | 0.0029163 ell | 0.0032079 ell | 0.0034996 ell | 0.0037912 ell | 0.0040828 ell | 0.0043745 ell | 0.0046661 ell | 0.0049577 ell | 0.0052493 ell | 0.0055410 ell | 0.0058326 ell | 0.0061242 ell | 0.0064159 ell | 0.0067075 ell | 0.0069991 ell | 0.0072908 ell | 0.0075824 ell | 0.0078740 ell | 0.0081656 ell | 0.0084573 ell | 0.0087489 ell | 0.0090405 ell | 0.0093322 ell | 0.0096238 ell | 0.0099154 ell | 0.0102071 ell | 0.0104987 ell | 0.0107903 ell | 0.0110819 ell | 0.0113736 ell | 0.0116652 ell | 0.0119568 ell | 0.0122485 ell | 0.0125401 ell | 0.0128317 ell | 0.0131234 ell | 0.0134150 ell | 0.0137066 ell | 0.0139983 ell | 0.0142899 ell | 0.0145815 ell | 0.0148731 ell | 0.0151648 ell | 0.0154564 ell | 0.0157480 ell | 0.0160397 ell | 0.0163313 ell | 0.0166229 ell | 0.0169146 ell | 0.0172062 ell | 0.0174978 ell | 0.0177894 ell | 0.0180811 ell | 0.0183727 ell | 0.0186643 ell | 0.0189560 ell | 0.0192476 ell | 0.0195392 ell | 0.0198309 ell | 0.0201225 ell | 0.0204141 ell | 0.0207057 ell | 0.0209974 ell | 0.0212890 ell | 0.0215806 ell | 0.0218723 ell | 0.0221639 ell | 0.0224555 ell | 0.0227472 ell | 0.0230388 ell | 0.0233304 ell | 0.0236220 ell | 0.0239137 ell | 0.0242053 ell | 0.0244969 ell | 0.0247886 ell | 0.0250802 ell | 0.0253718 ell | 0.0256635 ell | 0.0259551 ell | 0.0262467 ell | 0.0265383 ell | 0.0268300 ell | 0.0271216 ell | 0.0274132 ell | 0.0277049 ell | 0.0279965 ell | 0.0282881 ell | 0.0285798 ell | 0.0288714 ell | 0.0291630 ell |
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 | ell | french; charriere | ell |
|---|---|---|---|
| 1 | = 0.00029163021289006 | 4 | = 0.0011665208515602 |
| 1.5 | = 0.00043744531933508 | 4.5 | = 0.0013123359580052 |
| 2 | = 0.00058326042578011 | 5 | = 0.0014581510644503 |
| 2.5 | = 0.00072907553222514 | 5.5 | = 0.0016039661708953 |
| 3 | = 0.00087489063867017 | 6 | = 0.0017497812773403 |
An ell (from Proto-Germanic *alinō, cognate with Latin ulna) is a unit of measurement, originally a cubit, i.e., approximating the length of a man's arm from the elbow ("elbow" means the bend or bow of the ell or arm) to the tip of the middle finger, or about 18 inches (457 mm); in later usage, any of several longer units.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| ell | ell | ≡ 45 in (In England usually) | = 1.143 m | Other (Length) |
| ell | french; charriere | ell | french; charriere |
|---|---|---|---|
| 1 | = 3429 | 4 | = 13716 |
| 1.5 | = 5143.5 | 4.5 | = 15430.5 |
| 2 | = 6858 | 5 | = 17145 |
| 2.5 | = 8572.5 | 5.5 | = 18859.5 |
| 3 | = 10287 | 6 | = 20574 |
| french; charriere | ell |
|---|---|
| 1 | = 0.0002916 |
| 3 429 | = 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 …) |