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 |
quarter | 0.0014582 qr. | 0.0029163 qr. | 0.0043745 qr. | 0.0058326 qr. | 0.0072908 qr. | 0.0087489 qr. | 0.0102071 qr. | 0.0116652 qr. | 0.0131234 qr. | 0.0145815 qr. | 0.0160397 qr. | 0.0174978 qr. | 0.0189560 qr. | 0.0204141 qr. | 0.0218723 qr. | 0.0233304 qr. | 0.0247886 qr. | 0.0262467 qr. | 0.0277049 qr. | 0.0291630 qr. | 0.0306212 qr. | 0.0320793 qr. | 0.0335375 qr. | 0.0349956 qr. | 0.0364538 qr. | 0.0379119 qr. | 0.0393701 qr. | 0.0408282 qr. | 0.0422864 qr. | 0.0437445 qr. | 0.0452027 qr. | 0.0466608 qr. | 0.0481190 qr. | 0.0495771 qr. | 0.0510353 qr. | 0.0524934 qr. | 0.0539516 qr. | 0.0554097 qr. | 0.0568679 qr. | 0.0583260 qr. | 0.0597842 qr. | 0.0612423 qr. | 0.0627005 qr. | 0.0641586 qr. | 0.0656168 qr. | 0.0670749 qr. | 0.0685331 qr. | 0.0699913 qr. | 0.0714494 qr. | 0.0729076 qr. | 0.0743657 qr. | 0.0758239 qr. | 0.0772820 qr. | 0.0787402 qr. | 0.0801983 qr. | 0.0816565 qr. | 0.0831146 qr. | 0.0845728 qr. | 0.0860309 qr. | 0.0874891 qr. | 0.0889472 qr. | 0.0904054 qr. | 0.0918635 qr. | 0.0933217 qr. | 0.0947798 qr. | 0.0962380 qr. | 0.0976961 qr. | 0.0991543 qr. | 0.1006124 qr. | 0.1020706 qr. | 0.1035287 qr. | 0.1049869 qr. | 0.1064450 qr. | 0.1079032 qr. | 0.1093613 qr. | 0.1108195 qr. | 0.1122776 qr. | 0.1137358 qr. | 0.1151939 qr. | 0.1166521 qr. | 0.1181102 qr. | 0.1195684 qr. | 0.1210265 qr. | 0.1224847 qr. | 0.1239428 qr. | 0.1254010 qr. | 0.1268591 qr. | 0.1283173 qr. | 0.1297754 qr. | 0.1312336 qr. | 0.1326917 qr. | 0.1341499 qr. | 0.1356080 qr. | 0.1370662 qr. | 0.1385244 qr. | 0.1399825 qr. | 0.1414407 qr. | 0.1428988 qr. | 0.1443570 qr. | 0.1458151 qr. |
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 | quarters | french; charriere | quarters |
---|---|---|---|
1 | = 0.0014581510644503 | 4 | = 0.0058326042578011 |
1.5 | = 0.0021872265966754 | 4.5 | = 0.0065616797900262 |
2 | = 0.0029163021289006 | 5 | = 0.0072907553222514 |
2.5 | = 0.0036453776611257 | 5.5 | = 0.0080198308544765 |
3 | = 0.0043744531933508 | 6 | = 0.0087489063867017 |
The quarter (lit. "one-fourth") is used as the name of several distinct English units based on ¼ sizes of some base unit.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
quarter | qr. | ≡ 1⁄4 yd | = 0.2286 m | Metric system SI |
quarters | french; charriere | quarters | french; charriere |
---|---|---|---|
1 | = 685.8 | 4 | = 2743.2 |
1.5 | = 1028.7 | 4.5 | = 3086.1 |
2 | = 1371.6 | 5 | = 3429 |
2.5 | = 1714.5 | 5.5 | = 3771.9 |
3 | = 2057.4 | 6 | = 4114.8 |
french; charriere | quarters |
---|---|
1 | = 0.0014582 |
685.8 | = 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 …) |