| mil | 1 mil | 2 mil | 3 mil | 4 mil | 5 mil | 6 mil | 7 mil | 8 mil | 9 mil | 10 mil | 11 mil | 12 mil | 13 mil | 14 mil | 15 mil | 16 mil | 17 mil | 18 mil | 19 mil | 20 mil | 21 mil | 22 mil | 23 mil | 24 mil | 25 mil | 26 mil | 27 mil | 28 mil | 29 mil | 30 mil | 31 mil | 32 mil | 33 mil | 34 mil | 35 mil | 36 mil | 37 mil | 38 mil | 39 mil | 40 mil | 41 mil | 42 mil | 43 mil | 44 mil | 45 mil | 46 mil | 47 mil | 48 mil | 49 mil | 50 mil | 51 mil | 52 mil | 53 mil | 54 mil | 55 mil | 56 mil | 57 mil | 58 mil | 59 mil | 60 mil | 61 mil | 62 mil | 63 mil | 64 mil | 65 mil | 66 mil | 67 mil | 68 mil | 69 mil | 70 mil | 71 mil | 72 mil | 73 mil | 74 mil | 75 mil | 76 mil | 77 mil | 78 mil | 79 mil | 80 mil | 81 mil | 82 mil | 83 mil | 84 mil | 85 mil | 86 mil | 87 mil | 88 mil | 89 mil | 90 mil | 91 mil | 92 mil | 93 mil | 94 mil | 95 mil | 96 mil | 97 mil | 98 mil | 99 mil | 100 mil |
| french; charriere | 0.0762 F | 0.1524 F | 0.2286 F | 0.3048 F | 0.381 F | 0.4572 F | 0.5334 F | 0.6096 F | 0.6858 F | 0.762 F | 0.8382 F | 0.9144 F | 0.9906 F | 1.0668 F | 1.143 F | 1.2192 F | 1.2954 F | 1.3716 F | 1.4478 F | 1.524 F | 1.6002 F | 1.6764 F | 1.7526 F | 1.8288 F | 1.905 F | 1.9812 F | 2.0574 F | 2.1336 F | 2.2098 F | 2.286 F | 2.3622 F | 2.4384 F | 2.5146 F | 2.5908 F | 2.667 F | 2.7432 F | 2.8194 F | 2.8956 F | 2.9718 F | 3.048 F | 3.1242 F | 3.2004 F | 3.2766 F | 3.3528 F | 3.429 F | 3.5052 F | 3.5814 F | 3.6576 F | 3.7338 F | 3.81 F | 3.8862 F | 3.9624 F | 4.0386 F | 4.1148 F | 4.191 F | 4.2672 F | 4.3434 F | 4.4196 F | 4.4958 F | 4.572 F | 4.6482 F | 4.7244 F | 4.8006 F | 4.8768 F | 4.953 F | 5.0292 F | 5.1054 F | 5.1816 F | 5.2578 F | 5.334 F | 5.4102 F | 5.4864 F | 5.5626 F | 5.6388 F | 5.715 F | 5.7912 F | 5.8674 F | 5.9436 F | 6.0198 F | 6.096 F | 6.1722 F | 6.2484 F | 6.3246 F | 6.4008 F | 6.477 F | 6.5532 F | 6.6294 F | 6.7056 F | 6.7818 F | 6.858 F | 6.9342 F | 7.0104 F | 7.0866 F | 7.1628 F | 7.239 F | 7.3152 F | 7.3914 F | 7.4676 F | 7.5438 F | 7.62 F |
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 mils = 0.0762 french; charriere | 4 mils = 0.3048 french; charriere |
| 1.5 mils = 0.1143 french; charriere | 4.5 mils = 0.3429 french; charriere |
| 2 mils = 0.1524 french; charriere | 5 mils = 0.381 french; charriere |
| 2.5 mils = 0.1905 french; charriere | 5.5 mils = 0.4191 french; charriere |
| 3 mils = 0.2286 french; charriere | 6 mils = 0.4572 french; charriere |
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 mils | 4 french; charriere = 52.49343832021 mils |
| 1.5 french; charriere = 19.685039370079 mils | 4.5 french; charriere = 59.055118110236 mils |
| 2 french; charriere = 26.246719160105 mils | 5 french; charriere = 65.616797900262 mils |
| 2.5 french; charriere = 32.808398950131 mils | 5.5 french; charriere = 72.178477690289 mils |
| 3 french; charriere = 39.370078740157 mils | 6 french; charriere = 78.740157480315 mils |
| 1 mils = 0.0762 french; charriere |
| 1 french; charriere = 13.1233596 mils |