| 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 |
| foot | 0.0010936 ft | 0.0021872 ft | 0.0032808 ft | 0.0043745 ft | 0.0054681 ft | 0.0065617 ft | 0.0076553 ft | 0.0087489 ft | 0.0098425 ft | 0.0109361 ft | 0.0120297 ft | 0.0131234 ft | 0.0142170 ft | 0.0153106 ft | 0.0164042 ft | 0.0174978 ft | 0.0185914 ft | 0.0196850 ft | 0.0207787 ft | 0.0218723 ft | 0.0229659 ft | 0.0240595 ft | 0.0251531 ft | 0.0262467 ft | 0.0273403 ft | 0.0284339 ft | 0.0295276 ft | 0.0306212 ft | 0.0317148 ft | 0.0328084 ft | 0.0339020 ft | 0.0349956 ft | 0.0360892 ft | 0.0371829 ft | 0.0382765 ft | 0.0393701 ft | 0.0404637 ft | 0.0415573 ft | 0.0426509 ft | 0.0437445 ft | 0.0448381 ft | 0.0459318 ft | 0.0470254 ft | 0.0481190 ft | 0.0492126 ft | 0.0503062 ft | 0.0513998 ft | 0.0524934 ft | 0.0535871 ft | 0.0546807 ft | 0.0557743 ft | 0.0568679 ft | 0.0579615 ft | 0.0590551 ft | 0.0601487 ft | 0.0612423 ft | 0.0623360 ft | 0.0634296 ft | 0.0645232 ft | 0.0656168 ft | 0.0667104 ft | 0.0678040 ft | 0.0688976 ft | 0.0699913 ft | 0.0710849 ft | 0.0721785 ft | 0.0732721 ft | 0.0743657 ft | 0.0754593 ft | 0.0765529 ft | 0.0776465 ft | 0.0787402 ft | 0.0798338 ft | 0.0809274 ft | 0.0820210 ft | 0.0831146 ft | 0.0842082 ft | 0.0853018 ft | 0.0863955 ft | 0.0874891 ft | 0.0885827 ft | 0.0896763 ft | 0.0907699 ft | 0.0918635 ft | 0.0929571 ft | 0.0940507 ft | 0.0951444 ft | 0.0962380 ft | 0.0973316 ft | 0.0984252 ft | 0.0995188 ft | 0.1006124 ft | 0.1017060 ft | 0.1027997 ft | 0.1038933 ft | 0.1049869 ft | 0.1060805 ft | 0.1071741 ft | 0.1082677 ft | 0.1093613 ft |
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 | feet | french; charriere | feet |
|---|---|---|---|
| 1 | = 0.0010936132983377 | 4 | = 0.0043744531933508 |
| 1.5 | = 0.0016404199475066 | 4.5 | = 0.0049212598425197 |
| 2 | = 0.0021872265966754 | 5 | = 0.0054680664916885 |
| 2.5 | = 0.0027340332458443 | 5.5 | = 0.0060148731408574 |
| 3 | = 0.0032808398950131 | 6 | = 0.0065616797900262 |
The foot (pl. feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| foot | ft | ≡ 0.3048 m ≡ 1⁄3 yd ≡ 12 inches | ≡ 0.3048 m | Imperial/US |
| feet | french; charriere | feet | french; charriere |
|---|---|---|---|
| 1 | = 914.4 | 4 | = 3657.6 |
| 1.5 | = 1371.6 | 4.5 | = 4114.8 |
| 2 | = 1828.8 | 5 | = 4572 |
| 2.5 | = 2286 | 5.5 | = 5029.2 |
| 3 | = 2743.2 | 6 | = 5486.4 |
| french; charriere | feet |
|---|---|
| 1 | = 0.0010936 |
| 914.4 | = 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 …) |