| 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 |
| barleycorn | 0.0394011 barleycorn | 0.0788022 barleycorn | 0.1182033 barleycorn | 0.1576044 barleycorn | 0.1970055 barleycorn | 0.2364066 barleycorn | 0.2758077 barleycorn | 0.3152088 barleycorn | 0.3546099 barleycorn | 0.3940110 barleycorn | 0.4334121 barleycorn | 0.4728132 barleycorn | 0.5122143 barleycorn | 0.5516154 barleycorn | 0.5910165 barleycorn | 0.6304177 barleycorn | 0.6698188 barleycorn | 0.7092199 barleycorn | 0.7486210 barleycorn | 0.7880221 barleycorn | 0.8274232 barleycorn | 0.8668243 barleycorn | 0.9062254 barleycorn | 0.9456265 barleycorn | 0.9850276 barleycorn | 1.0244287 barleycorn | 1.0638298 barleycorn | 1.1032309 barleycorn | 1.1426320 barleycorn | 1.1820331 barleycorn | 1.2214342 barleycorn | 1.2608353 barleycorn | 1.3002364 barleycorn | 1.3396375 barleycorn | 1.3790386 barleycorn | 1.4184397 barleycorn | 1.4578408 barleycorn | 1.4972419 barleycorn | 1.5366430 barleycorn | 1.5760441 barleycorn | 1.6154452 barleycorn | 1.6548463 barleycorn | 1.6942474 barleycorn | 1.7336485 barleycorn | 1.7730496 barleycorn | 1.8124507 barleycorn | 1.8518519 barleycorn | 1.8912530 barleycorn | 1.9306541 barleycorn | 1.9700552 barleycorn | 2.0094563 barleycorn | 2.0488574 barleycorn | 2.0882585 barleycorn | 2.1276596 barleycorn | 2.1670607 barleycorn | 2.2064618 barleycorn | 2.2458629 barleycorn | 2.2852640 barleycorn | 2.3246651 barleycorn | 2.3640662 barleycorn | 2.4034673 barleycorn | 2.4428684 barleycorn | 2.4822695 barleycorn | 2.5216706 barleycorn | 2.5610717 barleycorn | 2.6004728 barleycorn | 2.6398739 barleycorn | 2.6792750 barleycorn | 2.7186761 barleycorn | 2.7580772 barleycorn | 2.7974783 barleycorn | 2.8368794 barleycorn | 2.8762805 barleycorn | 2.9156816 barleycorn | 2.9550827 barleycorn | 2.9944838 barleycorn | 3.0338849 barleycorn | 3.0732861 barleycorn | 3.1126872 barleycorn | 3.1520883 barleycorn | 3.1914894 barleycorn | 3.2308905 barleycorn | 3.2702916 barleycorn | 3.3096927 barleycorn | 3.3490938 barleycorn | 3.3884949 barleycorn | 3.4278960 barleycorn | 3.4672971 barleycorn | 3.5066982 barleycorn | 3.5460993 barleycorn | 3.5855004 barleycorn | 3.6249015 barleycorn | 3.6643026 barleycorn | 3.7037037 barleycorn | 3.7431048 barleycorn | 3.7825059 barleycorn | 3.8219070 barleycorn | 3.8613081 barleycorn | 3.9007092 barleycorn | 3.9401103 barleycorn |
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 | barleycorns | french; charriere | barleycorns |
|---|---|---|---|
| 1 | ≈ 0.03940110323089 | 4 | ≈ 0.15760441292356 |
| 1.5 | ≈ 0.059101654846336 | 4.5 | ≈ 0.17730496453901 |
| 2 | ≈ 0.078802206461781 | 5 | ≈ 0.19700551615445 |
| 2.5 | ≈ 0.098502758077226 | 5.5 | ≈ 0.2167060677699 |
| 3 | ≈ 0.11820330969267 | 6 | ≈ 0.23640661938534 |
The barleycorn is a small English unit of length equal to 1⁄3 of an inch (i.e., close to 0.8467 cm) still used in Great Britain and Ireland as a determiner of shoe sizes.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| barleycorn | = 1⁄3 in | ≈ 8.46×10−3 m | Imperial/US |
| barleycorns | french; charriere | barleycorns | french; charriere |
|---|---|---|---|
| 1 | ≈ 25.38 | 4 | ≈ 101.52 |
| 1.5 | ≈ 38.07 | 4.5 | ≈ 114.21 |
| 2 | ≈ 50.76 | 5 | ≈ 126.9 |
| 2.5 | ≈ 63.45 | 5.5 | ≈ 139.59 |
| 3 | ≈ 76.14 | 6 | ≈ 152.28 |
| french; charriere | barleycorns |
|---|---|
| 1 | ≈ 0.0394011 |
| 25.38 | ≈ 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 …) |