| micrometer | 1 μm | 2 μm | 3 μm | 4 μm | 5 μm | 6 μm | 7 μm | 8 μm | 9 μm | 10 μm | 11 μm | 12 μm | 13 μm | 14 μm | 15 μm | 16 μm | 17 μm | 18 μm | 19 μm | 20 μm | 21 μm | 22 μm | 23 μm | 24 μm | 25 μm | 26 μm | 27 μm | 28 μm | 29 μm | 30 μm | 31 μm | 32 μm | 33 μm | 34 μm | 35 μm | 36 μm | 37 μm | 38 μm | 39 μm | 40 μm | 41 μm | 42 μm | 43 μm | 44 μm | 45 μm | 46 μm | 47 μm | 48 μm | 49 μm | 50 μm | 51 μm | 52 μm | 53 μm | 54 μm | 55 μm | 56 μm | 57 μm | 58 μm | 59 μm | 60 μm | 61 μm | 62 μm | 63 μm | 64 μm | 65 μm | 66 μm | 67 μm | 68 μm | 69 μm | 70 μm | 71 μm | 72 μm | 73 μm | 74 μm | 75 μm | 76 μm | 77 μm | 78 μm | 79 μm | 80 μm | 81 μm | 82 μm | 83 μm | 84 μm | 85 μm | 86 μm | 87 μm | 88 μm | 89 μm | 90 μm | 91 μm | 92 μm | 93 μm | 94 μm | 95 μm | 96 μm | 97 μm | 98 μm | 99 μm | 100 μm |
| french; charriere | 0.003 F | 0.006 F | 0.009 F | 0.012 F | 0.015 F | 0.018 F | 0.021 F | 0.024 F | 0.027 F | 0.03 F | 0.033 F | 0.036 F | 0.039 F | 0.042 F | 0.045 F | 0.048 F | 0.051 F | 0.054 F | 0.057 F | 0.06 F | 0.063 F | 0.066 F | 0.069 F | 0.072 F | 0.075 F | 0.078 F | 0.081 F | 0.084 F | 0.087 F | 0.09 F | 0.093 F | 0.096 F | 0.099 F | 0.102 F | 0.105 F | 0.108 F | 0.111 F | 0.114 F | 0.117 F | 0.12 F | 0.123 F | 0.126 F | 0.129 F | 0.132 F | 0.135 F | 0.138 F | 0.141 F | 0.144 F | 0.147 F | 0.15 F | 0.153 F | 0.156 F | 0.159 F | 0.162 F | 0.165 F | 0.168 F | 0.171 F | 0.174 F | 0.177 F | 0.18 F | 0.183 F | 0.186 F | 0.189 F | 0.192 F | 0.195 F | 0.198 F | 0.201 F | 0.204 F | 0.207 F | 0.21 F | 0.213 F | 0.216 F | 0.219 F | 0.222 F | 0.225 F | 0.228 F | 0.231 F | 0.234 F | 0.237 F | 0.24 F | 0.243 F | 0.246 F | 0.249 F | 0.252 F | 0.255 F | 0.258 F | 0.261 F | 0.264 F | 0.267 F | 0.27 F | 0.273 F | 0.276 F | 0.279 F | 0.282 F | 0.285 F | 0.288 F | 0.291 F | 0.294 F | 0.297 F | 0.3 F |
The micrometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: μm) or micrometer (American spelling), also commonly known as a micron, is an SI derived unit of length equaling 1×10−6 of a metre (SI standard prefix "micro-" = 10−6); that is, one millionth of a metre (or one thousandth of a millimetre, 0.001 mm, or about 0.000039 inch).
| 1 micrometers = 0.003 french; charriere | 4 micrometers = 0.012 french; charriere |
| 1.5 micrometers = 0.0045 french; charriere | 4.5 micrometers = 0.0135 french; charriere |
| 2 micrometers = 0.006 french; charriere | 5 micrometers = 0.015 french; charriere |
| 2.5 micrometers = 0.0075 french; charriere | 5.5 micrometers = 0.0165 french; charriere |
| 3 micrometers = 0.009 french; charriere | 6 micrometers = 0.018 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 = 333.33333333333 micrometers | 4 french; charriere = 1333.3333333333 micrometers |
| 1.5 french; charriere = 500 micrometers | 4.5 french; charriere = 1500 micrometers |
| 2 french; charriere = 666.66666666667 micrometers | 5 french; charriere = 1666.6666666667 micrometers |
| 2.5 french; charriere = 833.33333333333 micrometers | 5.5 french; charriere = 1833.3333333333 micrometers |
| 3 french; charriere = 1000 micrometers | 6 french; charriere = 2000 micrometers |
| 1 micrometers = 0.003 french; charriere |
| 1 french; charriere = 333.3333333 micrometers |