| 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 |
| point (PostScript) | 0.9450903 pt | 1.8901805 pt | 2.8352708 pt | 3.7803610 pt | 4.7254513 pt | 5.6705415 pt | 6.6156318 pt | 7.5607220 pt | 8.5058123 pt | 9.4509026 pt | 10.3959928 pt | 11.3410831 pt | 12.2861733 pt | 13.2312636 pt | 14.1763538 pt | 15.1214441 pt | 16.0665344 pt | 17.0116246 pt | 17.9567149 pt | 18.9018051 pt | 19.8468954 pt | 20.7919856 pt | 21.7370759 pt | 22.6821661 pt | 23.6272564 pt | 24.5723467 pt | 25.5174369 pt | 26.4625272 pt | 27.4076174 pt | 28.3527077 pt | 29.2977979 pt | 30.2428882 pt | 31.1879785 pt | 32.1330687 pt | 33.0781590 pt | 34.0232492 pt | 34.9683395 pt | 35.9134297 pt | 36.8585200 pt | 37.8036102 pt | 38.7487005 pt | 39.6937908 pt | 40.6388810 pt | 41.5839713 pt | 42.5290615 pt | 43.4741518 pt | 44.4192420 pt | 45.3643323 pt | 46.3094225 pt | 47.2545128 pt | 48.1996031 pt | 49.1446933 pt | 50.0897836 pt | 51.0348738 pt | 51.9799641 pt | 52.9250543 pt | 53.8701446 pt | 54.8152349 pt | 55.7603251 pt | 56.7054154 pt | 57.6505056 pt | 58.5955959 pt | 59.5406861 pt | 60.4857764 pt | 61.4308666 pt | 62.3759569 pt | 63.3210472 pt | 64.2661374 pt | 65.2112277 pt | 66.1563179 pt | 67.1014082 pt | 68.0464984 pt | 68.9915887 pt | 69.9366790 pt | 70.8817692 pt | 71.8268595 pt | 72.7719497 pt | 73.7170400 pt | 74.6621302 pt | 75.6072205 pt | 76.5523107 pt | 77.4974010 pt | 78.4424913 pt | 79.3875815 pt | 80.3326718 pt | 81.2777620 pt | 82.2228523 pt | 83.1679425 pt | 84.1130328 pt | 85.0581231 pt | 86.0032133 pt | 86.9483036 pt | 87.8933938 pt | 88.8384841 pt | 89.7835743 pt | 90.7286646 pt | 91.6737548 pt | 92.6188451 pt | 93.5639354 pt | 94.5090256 pt |
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 | points (PostScript) | french; charriere | points (PostScript) |
|---|---|---|---|
| 1 | = 0.94509025611946 | 4 | = 3.7803610244778 |
| 1.5 | = 1.4176353841792 | 4.5 | = 4.2529061525376 |
| 2 | = 1.8901805122389 | 5 | = 4.7254512805973 |
| 2.5 | = 2.3627256402986 | 5.5 | = 5.197996408657 |
| 3 | = 2.8352707683584 | 6 | = 5.6705415367168 |
= 0.0003527 m
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| point (PostScript) | pt | ≡ 1⁄72 in | = 0.0003527 m | Other (Length) |
| points (PostScript) | french; charriere | points (PostScript) | french; charriere |
|---|---|---|---|
| 1 | = 1.0581 | 4 | = 4.2324 |
| 1.5 | = 1.58715 | 4.5 | = 4.76145 |
| 2 | = 2.1162 | 5 | = 5.2905 |
| 2.5 | = 2.64525 | 5.5 | = 5.81955 |
| 3 | = 3.1743 | 6 | = 6.3486 |
| french; charriere | points (PostScript) |
|---|---|
| 1 | = 0.9450903 |
| 1.0581 | = 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 …) |