| 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 |
| x unit | 3,326,348,002.528 xu | 6,652,696,005.056 xu | 9,979,044,007.5841 xu | 13,305,392,010.112 xu | 16,631,740,012.64 xu | 19,958,088,015.168 xu | 23,284,436,017.696 xu | 26,610,784,020.224 xu | 29,937,132,022.752 xu | 33,263,480,025.28 xu | 36,589,828,027.808 xu | 39,916,176,030.336 xu | 43,242,524,032.864 xu | 46,568,872,035.392 xu | 49,895,220,037.92 xu | 53,221,568,040.448 xu | 56,547,916,042.976 xu | 59,874,264,045.504 xu | 63,200,612,048.032 xu | 66,526,960,050.56 xu | 69,853,308,053.089 xu | 73,179,656,055.617 xu | 76,506,004,058.145 xu | 79,832,352,060.673 xu | 83,158,700,063.201 xu | 86,485,048,065.729 xu | 89,811,396,068.257 xu | 93,137,744,070.785 xu | 96,464,092,073.313 xu | 99,790,440,075.841 xu | 103,116,788,078.37 xu | 106,443,136,080.9 xu | 109,769,484,083.42 xu | 113,095,832,085.95 xu | 116,422,180,088.48 xu | 119,748,528,091.01 xu | 123,074,876,093.54 xu | 126,401,224,096.06 xu | 129,727,572,098.59 xu | 133,053,920,101.12 xu | 136,380,268,103.65 xu | 139,706,616,106.18 xu | 143,032,964,108.71 xu | 146,359,312,111.23 xu | 149,685,660,113.76 xu | 153,012,008,116.29 xu | 156,338,356,118.82 xu | 159,664,704,121.35 xu | 162,991,052,123.87 xu | 166,317,400,126.4 xu | 169,643,748,128.93 xu | 172,970,096,131.46 xu | 176,296,444,133.99 xu | 179,622,792,136.51 xu | 182,949,140,139.04 xu | 186,275,488,141.57 xu | 189,601,836,144.1 xu | 192,928,184,146.63 xu | 196,254,532,149.15 xu | 199,580,880,151.68 xu | 202,907,228,154.21 xu | 206,233,576,156.74 xu | 209,559,924,159.27 xu | 212,886,272,161.79 xu | 216,212,620,164.32 xu | 219,538,968,166.85 xu | 222,865,316,169.38 xu | 226,191,664,171.91 xu | 229,518,012,174.43 xu | 232,844,360,176.96 xu | 236,170,708,179.49 xu | 239,497,056,182.02 xu | 242,823,404,184.55 xu | 246,149,752,187.07 xu | 249,476,100,189.6 xu | 252,802,448,192.13 xu | 256,128,796,194.66 xu | 259,455,144,197.19 xu | 262,781,492,199.71 xu | 266,107,840,202.24 xu | 269,434,188,204.77 xu | 272,760,536,207.3 xu | 276,086,884,209.83 xu | 279,413,232,212.35 xu | 282,739,580,214.88 xu | 286,065,928,217.41 xu | 289,392,276,219.94 xu | 292,718,624,222.47 xu | 296,044,972,224.99 xu | 299,371,320,227.52 xu | 302,697,668,230.05 xu | 306,024,016,232.58 xu | 309,350,364,235.11 xu | 312,676,712,237.63 xu | 316,003,060,240.16 xu | 319,329,408,242.69 xu | 322,655,756,245.22 xu | 325,982,104,247.75 xu | 329,308,452,250.27 xu | 332,634,800,252.8 xu |
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 | x units | french; charriere | x units |
|---|---|---|---|
| 1 | ≈ 3326348002.528 | 4 | ≈ 13305392010.112 |
| 1.5 | ≈ 4989522003.792 | 4.5 | ≈ 14968566011.376 |
| 2 | ≈ 6652696005.056 | 5 | ≈ 16631740012.64 |
| 2.5 | ≈ 8315870006.3201 | 5.5 | ≈ 18294914013.904 |
| 3 | ≈ 9979044007.5841 | 6 | ≈ 19958088015.168 |
The x unit (symbol xu) is a unit of length approximately equal to 0.1 pm (10−13 m). It is used to quote the wavelength of X-rays and gamma rays.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| x unit | xu | ≈ 1.0021×10−13 m | ≈ 1.0021×10−13 m | Metric system Non-SI |
| x units | french; charriere | x units | french; charriere |
|---|---|---|---|
| 1 | ≈ 3.0063E-10 | 4 | ≈ 1.20252E-9 |
| 1.5 | ≈ 4.50945E-10 | 4.5 | ≈ 1.352835E-9 |
| 2 | ≈ 6.0126E-10 | 5 | ≈ 1.50315E-9 |
| 2.5 | ≈ 7.51575E-10 | 5.5 | ≈ 1.653465E-9 |
| 3 | ≈ 9.0189E-10 | 6 | ≈ 1.80378E-9 |
| french; charriere | x units |
|---|---|
| 1 | ≈ 3,326,348,002.528 |
| 3.0063 × 10-10 | ≈ 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 …) |