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 |
chain | 1.6569865512344 × 10-5 ch | 3.3139731024687 × 10-5 ch | 4.9709596537031 × 10-5 ch | 6.6279462049374 × 10-5 ch | 8.2849327561718 × 10-5 ch | 9.9419193074061 × 10-5 ch | 0.0001160 ch | 0.0001326 ch | 0.0001491 ch | 0.0001657 ch | 0.0001823 ch | 0.0001988 ch | 0.0002154 ch | 0.0002320 ch | 0.0002485 ch | 0.0002651 ch | 0.0002817 ch | 0.0002983 ch | 0.0003148 ch | 0.0003314 ch | 0.0003480 ch | 0.0003645 ch | 0.0003811 ch | 0.0003977 ch | 0.0004142 ch | 0.0004308 ch | 0.0004474 ch | 0.0004640 ch | 0.0004805 ch | 0.0004971 ch | 0.0005137 ch | 0.0005302 ch | 0.0005468 ch | 0.0005634 ch | 0.0005799 ch | 0.0005965 ch | 0.0006131 ch | 0.0006297 ch | 0.0006462 ch | 0.0006628 ch | 0.0006794 ch | 0.0006959 ch | 0.0007125 ch | 0.0007291 ch | 0.0007456 ch | 0.0007622 ch | 0.0007788 ch | 0.0007954 ch | 0.0008119 ch | 0.0008285 ch | 0.0008451 ch | 0.0008616 ch | 0.0008782 ch | 0.0008948 ch | 0.0009113 ch | 0.0009279 ch | 0.0009445 ch | 0.0009611 ch | 0.0009776 ch | 0.0009942 ch | 0.0010108 ch | 0.0010273 ch | 0.0010439 ch | 0.0010605 ch | 0.0010770 ch | 0.0010936 ch | 0.0011102 ch | 0.0011268 ch | 0.0011433 ch | 0.0011599 ch | 0.0011765 ch | 0.0011930 ch | 0.0012096 ch | 0.0012262 ch | 0.0012427 ch | 0.0012593 ch | 0.0012759 ch | 0.0012924 ch | 0.0013090 ch | 0.0013256 ch | 0.0013422 ch | 0.0013587 ch | 0.0013753 ch | 0.0013919 ch | 0.0014084 ch | 0.0014250 ch | 0.0014416 ch | 0.0014581 ch | 0.0014747 ch | 0.0014913 ch | 0.0015079 ch | 0.0015244 ch | 0.0015410 ch | 0.0015576 ch | 0.0015741 ch | 0.0015907 ch | 0.0016073 ch | 0.0016238 ch | 0.0016404 ch | 0.0016570 ch |
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 | chains | french; charriere | chains |
---|---|---|---|
1 | ≈ 1.6569865512344E-5 | 4 | ≈ 6.6279462049374E-5 |
1.5 | ≈ 2.4854798268515E-5 | 4.5 | ≈ 7.4564394805546E-5 |
2 | ≈ 3.3139731024687E-5 | 5 | ≈ 8.2849327561718E-5 |
2.5 | ≈ 4.1424663780859E-5 | 5.5 | ≈ 9.113426031789E-5 |
3 | ≈ 4.9709596537031E-5 | 6 | ≈ 9.9419193074061E-5 |
A chain is a unit of length. It measures 66 feet, or 22 yards, or 100 links, or 4 rods (20.1168 m). There are 10 chains in a furlong, and 80 chains in one statute mile. An acre is the area of 10 square chains (that is, an area of one chain by one furlong). The chain has been used for several centuries in Britain and in some other countries influenced by British practice.
Name of unit | Symbol | Definition | Relation to SI units | Unit System |
---|---|---|---|---|
chain | ch | ≡ 66 ft (US) ≡ 4 rods | ≈ 20.11684 m | Imperial/US |
chains | french; charriere | chains | french; charriere |
---|---|---|---|
1 | ≈ 60350.52 | 4 | ≈ 241402.08 |
1.5 | ≈ 90525.78 | 4.5 | ≈ 271577.34 |
2 | ≈ 120701.04 | 5 | ≈ 301752.6 |
2.5 | ≈ 150876.3 | 5.5 | ≈ 331927.86 |
3 | ≈ 181051.56 | 6 | ≈ 362103.12 |
french; charriere | chains |
---|---|
1 | ≈ 1.6569865512344 × 10-5 |
60,350.52 | ≈ 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 …) |