| 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 |
| thou | 13.1233596 th | 26.2467192 th | 39.3700787 th | 52.4934383 th | 65.6167979 th | 78.7401575 th | 91.8635171 th | 104.9868766 th | 118.1102362 th | 131.2335958 th | 144.3569554 th | 157.4803150 th | 170.6036745 th | 183.7270341 th | 196.8503937 th | 209.9737533 th | 223.0971129 th | 236.2204724 th | 249.3438320 th | 262.4671916 th | 275.5905512 th | 288.7139108 th | 301.8372703 th | 314.9606299 th | 328.0839895 th | 341.2073491 th | 354.3307087 th | 367.4540682 th | 380.5774278 th | 393.7007874 th | 406.8241470 th | 419.9475066 th | 433.0708661 th | 446.1942257 th | 459.3175853 th | 472.4409449 th | 485.5643045 th | 498.6876640 th | 511.8110236 th | 524.9343832 th | 538.0577428 th | 551.1811024 th | 564.3044619 th | 577.4278215 th | 590.5511811 th | 603.6745407 th | 616.7979003 th | 629.9212598 th | 643.0446194 th | 656.1679790 th | 669.2913386 th | 682.4146982 th | 695.5380577 th | 708.6614173 th | 721.7847769 th | 734.9081365 th | 748.0314961 th | 761.1548556 th | 774.2782152 th | 787.4015748 th | 800.5249344 th | 813.6482940 th | 826.7716535 th | 839.8950131 th | 853.0183727 th | 866.1417323 th | 879.2650919 th | 892.3884514 th | 905.5118110 th | 918.6351706 th | 931.7585302 th | 944.8818898 th | 958.0052493 th | 971.1286089 th | 984.2519685 th | 997.3753281 th | 1,010.4986877 th | 1,023.6220472 th | 1,036.7454068 th | 1,049.8687664 th | 1,062.9921260 th | 1,076.1154856 th | 1,089.2388451 th | 1,102.3622047 th | 1,115.4855643 th | 1,128.6089239 th | 1,141.7322835 th | 1,154.8556430 th | 1,167.9790026 th | 1,181.1023622 th | 1,194.2257218 th | 1,207.3490814 th | 1,220.4724409 th | 1,233.5958005 th | 1,246.7191601 th | 1,259.8425197 th | 1,272.9658793 th | 1,286.0892388 th | 1,299.2125984 th | 1,312.3359580 th |
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 = 13.123359580052 thous | 4 french; charriere = 52.49343832021 thous |
| 1.5 french; charriere = 19.685039370079 thous | 4.5 french; charriere = 59.055118110236 thous |
| 2 french; charriere = 26.246719160105 thous | 5 french; charriere = 65.616797900262 thous |
| 2.5 french; charriere = 32.808398950131 thous | 5.5 french; charriere = 72.178477690289 thous |
| 3 french; charriere = 39.370078740157 thous | 6 french; charriere = 78.740157480315 thous |
A thousandth of an inch is a derived unit of length in an inch-based system of units. Equal to 0.001 inches, it is normally referred to as a thou /ˈθaʊ/, a thousandth, or (particularly in the United States) a mil.
| 1 thous = 0.0762 french; charriere | 4 thous = 0.3048 french; charriere |
| 1.5 thous = 0.1143 french; charriere | 4.5 thous = 0.3429 french; charriere |
| 2 thous = 0.1524 french; charriere | 5 thous = 0.381 french; charriere |
| 2.5 thous = 0.1905 french; charriere | 5.5 thous = 0.4191 french; charriere |
| 3 thous = 0.2286 french; charriere | 6 thous = 0.4572 french; charriere |
| 1 french; charriere = 13.1233596 thous |
| 1 thous = 0.0762 french; charriere |