| 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 |
| foot, metric (short) | 0.0011111 smf | 0.0022222 smf | 0.0033333 smf | 0.0044444 smf | 0.0055556 smf | 0.0066667 smf | 0.0077778 smf | 0.0088889 smf | 0.01 smf | 0.0111111 smf | 0.0122222 smf | 0.0133333 smf | 0.0144444 smf | 0.0155556 smf | 0.0166667 smf | 0.0177778 smf | 0.0188889 smf | 0.02 smf | 0.0211111 smf | 0.0222222 smf | 0.0233333 smf | 0.0244444 smf | 0.0255556 smf | 0.0266667 smf | 0.0277778 smf | 0.0288889 smf | 0.03 smf | 0.0311111 smf | 0.0322222 smf | 0.0333333 smf | 0.0344444 smf | 0.0355556 smf | 0.0366667 smf | 0.0377778 smf | 0.0388889 smf | 0.04 smf | 0.0411111 smf | 0.0422222 smf | 0.0433333 smf | 0.0444444 smf | 0.0455556 smf | 0.0466667 smf | 0.0477778 smf | 0.0488889 smf | 0.05 smf | 0.0511111 smf | 0.0522222 smf | 0.0533333 smf | 0.0544444 smf | 0.0555556 smf | 0.0566667 smf | 0.0577778 smf | 0.0588889 smf | 0.06 smf | 0.0611111 smf | 0.0622222 smf | 0.0633333 smf | 0.0644444 smf | 0.0655556 smf | 0.0666667 smf | 0.0677778 smf | 0.0688889 smf | 0.07 smf | 0.0711111 smf | 0.0722222 smf | 0.0733333 smf | 0.0744444 smf | 0.0755556 smf | 0.0766667 smf | 0.0777778 smf | 0.0788889 smf | 0.08 smf | 0.0811111 smf | 0.0822222 smf | 0.0833333 smf | 0.0844444 smf | 0.0855556 smf | 0.0866667 smf | 0.0877778 smf | 0.0888889 smf | 0.09 smf | 0.0911111 smf | 0.0922222 smf | 0.0933333 smf | 0.0944444 smf | 0.0955556 smf | 0.0966667 smf | 0.0977778 smf | 0.0988889 smf | 0.1 smf | 0.1011111 smf | 0.1022222 smf | 0.1033333 smf | 0.1044444 smf | 0.1055556 smf | 0.1066667 smf | 0.1077778 smf | 0.1088889 smf | 0.11 smf | 0.1111111 smf |
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 | feet, metric (short) | french; charriere | feet, metric (short) |
|---|---|---|---|
| 1 | = 0.0011111111111111 | 4 | = 0.0044444444444444 |
| 1.5 | = 0.0016666666666667 | 4.5 | = 0.005 |
| 2 | = 0.0022222222222222 | 5 | = 0.0055555555555556 |
| 2.5 | = 0.0027777777777778 | 5.5 | = 0.0061111111111111 |
| 3 | = 0.0033333333333333 | 6 | = 0.0066666666666667 |
≡ 0.30 m
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| foot, metric (short) | smf | ≡ 0.30 m | ≡ 0.30 m | Metric system SI |
| feet, metric (short) | french; charriere | feet, metric (short) | french; charriere |
|---|---|---|---|
| 1 | = 900 | 4 | = 3600 |
| 1.5 | = 1350 | 4.5 | = 4050 |
| 2 | = 1800 | 5 | = 4500 |
| 2.5 | = 2250 | 5.5 | = 4950 |
| 3 | = 2700 | 6 | = 5400 |
| french; charriere | feet, metric (short) |
|---|---|
| 1 | = 0.0011111 |
| 900 | = 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 …) |