| 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 |
| twip | 18.8985902 twp | 37.7971803 twp | 56.6957705 twp | 75.5943607 twp | 94.4929508 twp | 113.3915410 twp | 132.2901312 twp | 151.1887213 twp | 170.0873115 twp | 188.9859017 twp | 207.8844918 twp | 226.7830820 twp | 245.6816721 twp | 264.5802623 twp | 283.4788525 twp | 302.3774426 twp | 321.2760328 twp | 340.1746230 twp | 359.0732131 twp | 377.9718033 twp | 396.8703935 twp | 415.7689836 twp | 434.6675738 twp | 453.5661640 twp | 472.4647541 twp | 491.3633443 twp | 510.2619345 twp | 529.1605246 twp | 548.0591148 twp | 566.9577050 twp | 585.8562951 twp | 604.7548853 twp | 623.6534755 twp | 642.5520656 twp | 661.4506558 twp | 680.3492459 twp | 699.2478361 twp | 718.1464263 twp | 737.0450164 twp | 755.9436066 twp | 774.8421968 twp | 793.7407869 twp | 812.6393771 twp | 831.5379673 twp | 850.4365574 twp | 869.3351476 twp | 888.2337378 twp | 907.1323279 twp | 926.0309181 twp | 944.9295083 twp | 963.8280984 twp | 982.7266886 twp | 1,001.6252788 twp | 1,020.5238689 twp | 1,039.4224591 twp | 1,058.3210492 twp | 1,077.2196394 twp | 1,096.1182296 twp | 1,115.0168197 twp | 1,133.9154099 twp | 1,152.8140001 twp | 1,171.7125902 twp | 1,190.6111804 twp | 1,209.5097706 twp | 1,228.4083607 twp | 1,247.3069509 twp | 1,266.2055411 twp | 1,285.1041312 twp | 1,304.0027214 twp | 1,322.9013116 twp | 1,341.7999017 twp | 1,360.6984919 twp | 1,379.5970821 twp | 1,398.4956722 twp | 1,417.3942624 twp | 1,436.2928526 twp | 1,455.1914427 twp | 1,474.0900329 twp | 1,492.9886230 twp | 1,511.8872132 twp | 1,530.7858034 twp | 1,549.6843935 twp | 1,568.5829837 twp | 1,587.4815739 twp | 1,606.3801640 twp | 1,625.2787542 twp | 1,644.1773444 twp | 1,663.0759345 twp | 1,681.9745247 twp | 1,700.8731149 twp | 1,719.7717050 twp | 1,738.6702952 twp | 1,757.5688854 twp | 1,776.4674755 twp | 1,795.3660657 twp | 1,814.2646559 twp | 1,833.1632460 twp | 1,852.0618362 twp | 1,870.9604264 twp | 1,889.8590165 twp |
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).
| 1 french; charriere = 18.898590165174 twips | 4 french; charriere = 75.594360660695 twips |
| 1.5 french; charriere = 28.347885247761 twips | 4.5 french; charriere = 85.043655743282 twips |
| 2 french; charriere = 37.797180330347 twips | 5 french; charriere = 94.492950825868 twips |
| 2.5 french; charriere = 47.246475412934 twips | 5.5 french; charriere = 103.94224590846 twips |
| 3 french; charriere = 56.695770495521 twips | 6 french; charriere = 113.39154099104 twips |
A twip (abbreviating "twentieth of a point", "twentieth of an inch point", or "twentieth of an Imperial point"[citation needed]) is a typographical measurement, defined as 1/20 of a typographical point. One twip is 1/1440 inch or 17.639 µm.
| 1 twips = 0.052914 french; charriere | 4 twips = 0.211656 french; charriere |
| 1.5 twips = 0.079371 french; charriere | 4.5 twips = 0.238113 french; charriere |
| 2 twips = 0.105828 french; charriere | 5 twips = 0.26457 french; charriere |
| 2.5 twips = 0.132285 french; charriere | 5.5 twips = 0.291027 french; charriere |
| 3 twips = 0.158742 french; charriere | 6 twips = 0.317484 french; charriere |
| 1 french; charriere = 18.8985902 twips |
| 1 twips = 0.052914 french; charriere |