| 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 (long) | 0.001 lmf | 0.002 lmf | 0.003 lmf | 0.004 lmf | 0.005 lmf | 0.006 lmf | 0.007 lmf | 0.008 lmf | 0.009 lmf | 0.01 lmf | 0.011 lmf | 0.012 lmf | 0.013 lmf | 0.014 lmf | 0.015 lmf | 0.016 lmf | 0.017 lmf | 0.018 lmf | 0.019 lmf | 0.02 lmf | 0.021 lmf | 0.022 lmf | 0.023 lmf | 0.024 lmf | 0.025 lmf | 0.026 lmf | 0.027 lmf | 0.028 lmf | 0.029 lmf | 0.03 lmf | 0.031 lmf | 0.032 lmf | 0.033 lmf | 0.034 lmf | 0.035 lmf | 0.036 lmf | 0.037 lmf | 0.038 lmf | 0.039 lmf | 0.04 lmf | 0.041 lmf | 0.042 lmf | 0.043 lmf | 0.044 lmf | 0.045 lmf | 0.046 lmf | 0.047 lmf | 0.048 lmf | 0.049 lmf | 0.05 lmf | 0.051 lmf | 0.052 lmf | 0.053 lmf | 0.054 lmf | 0.055 lmf | 0.056 lmf | 0.057 lmf | 0.058 lmf | 0.059 lmf | 0.06 lmf | 0.061 lmf | 0.062 lmf | 0.063 lmf | 0.064 lmf | 0.065 lmf | 0.066 lmf | 0.067 lmf | 0.068 lmf | 0.069 lmf | 0.07 lmf | 0.071 lmf | 0.072 lmf | 0.073 lmf | 0.074 lmf | 0.075 lmf | 0.076 lmf | 0.077 lmf | 0.078 lmf | 0.079 lmf | 0.08 lmf | 0.081 lmf | 0.082 lmf | 0.083 lmf | 0.084 lmf | 0.085 lmf | 0.086 lmf | 0.087 lmf | 0.088 lmf | 0.089 lmf | 0.09 lmf | 0.091 lmf | 0.092 lmf | 0.093 lmf | 0.094 lmf | 0.095 lmf | 0.096 lmf | 0.097 lmf | 0.098 lmf | 0.099 lmf | 0.1 lmf |
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 (long) | french; charriere | feet, metric (long) |
|---|---|---|---|
| 1 | = 0.001 | 4 | = 0.004 |
| 1.5 | = 0.0015 | 4.5 | = 0.0045 |
| 2 | = 0.002 | 5 | = 0.005 |
| 2.5 | = 0.0025 | 5.5 | = 0.0055 |
| 3 | = 0.003 | 6 | = 0.006 |
A foot, metric (long) is the unit of length.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| foot, metric (long) | lmf | ≡ 1⁄3 m | ≈ 0.3 m | Metric system SI |
| feet, metric (long) | french; charriere | feet, metric (long) | french; charriere |
|---|---|---|---|
| 1 | = 1000 | 4 | = 4000 |
| 1.5 | = 1500 | 4.5 | = 4500 |
| 2 | = 2000 | 5 | = 5000 |
| 2.5 | = 2500 | 5.5 | = 5500 |
| 3 | = 3000 | 6 | = 6000 |
| french; charriere | feet, metric (long) |
|---|---|
| 1 | = 0.001 |
| 1 000 | = 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 …) |