| pica | 1 pica | 2 pica | 3 pica | 4 pica | 5 pica | 6 pica | 7 pica | 8 pica | 9 pica | 10 pica | 11 pica | 12 pica | 13 pica | 14 pica | 15 pica | 16 pica | 17 pica | 18 pica | 19 pica | 20 pica | 21 pica | 22 pica | 23 pica | 24 pica | 25 pica | 26 pica | 27 pica | 28 pica | 29 pica | 30 pica | 31 pica | 32 pica | 33 pica | 34 pica | 35 pica | 36 pica | 37 pica | 38 pica | 39 pica | 40 pica | 41 pica | 42 pica | 43 pica | 44 pica | 45 pica | 46 pica | 47 pica | 48 pica | 49 pica | 50 pica | 51 pica | 52 pica | 53 pica | 54 pica | 55 pica | 56 pica | 57 pica | 58 pica | 59 pica | 60 pica | 61 pica | 62 pica | 63 pica | 64 pica | 65 pica | 66 pica | 67 pica | 68 pica | 69 pica | 70 pica | 71 pica | 72 pica | 73 pica | 74 pica | 75 pica | 76 pica | 77 pica | 78 pica | 79 pica | 80 pica | 81 pica | 82 pica | 83 pica | 84 pica | 85 pica | 86 pica | 87 pica | 88 pica | 89 pica | 90 pica | 91 pica | 92 pica | 93 pica | 94 pica | 95 pica | 96 pica | 97 pica | 98 pica | 99 pica | 100 pica |
| french; charriere | 12.7000000 F | 25.4000000 F | 38.1000000 F | 50.8000000 F | 63.5000000 F | 76.1999999 F | 88.8999999 F | 101.5999999 F | 114.2999999 F | 126.9999999 F | 139.6999999 F | 152.3999999 F | 165.0999999 F | 177.7999999 F | 190.4999999 F | 203.1999998 F | 215.8999998 F | 228.5999998 F | 241.2999998 F | 253.9999998 F | 266.6999998 F | 279.3999998 F | 292.0999998 F | 304.7999998 F | 317.4999998 F | 330.1999997 F | 342.8999997 F | 355.5999997 F | 368.2999997 F | 380.9999997 F | 393.6999997 F | 406.3999997 F | 419.0999997 F | 431.7999997 F | 444.4999997 F | 457.1999996 F | 469.8999996 F | 482.5999996 F | 495.2999996 F | 507.9999996 F | 520.6999996 F | 533.3999996 F | 546.0999996 F | 558.7999996 F | 571.4999996 F | 584.1999995 F | 596.8999995 F | 609.5999995 F | 622.2999995 F | 634.9999995 F | 647.6999995 F | 660.3999995 F | 673.0999995 F | 685.7999995 F | 698.4999995 F | 711.1999994 F | 723.8999994 F | 736.5999994 F | 749.2999994 F | 761.9999994 F | 774.6999994 F | 787.3999994 F | 800.0999994 F | 812.7999994 F | 825.4999994 F | 838.1999993 F | 850.8999993 F | 863.5999993 F | 876.2999993 F | 888.9999993 F | 901.6999993 F | 914.3999993 F | 927.0999993 F | 939.7999993 F | 952.4999993 F | 965.1999992 F | 977.8999992 F | 990.5999992 F | 1,003.2999992 F | 1,015.9999992 F | 1,028.6999992 F | 1,041.3999992 F | 1,054.0999992 F | 1,066.7999992 F | 1,079.4999992 F | 1,092.1999991 F | 1,104.8999991 F | 1,117.5999991 F | 1,130.2999991 F | 1,142.9999991 F | 1,155.6999991 F | 1,168.3999991 F | 1,181.0999991 F | 1,193.7999991 F | 1,206.4999991 F | 1,219.1999990 F | 1,231.8999990 F | 1,244.5999990 F | 1,257.2999990 F | 1,269.999999 F |
The pica is a typographic unit of measure corresponding to approximately 1⁄6 of an inch, or 1⁄72 of a foot. One pica is further divided into 12 points.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| pica | ≡ 12 points | 0.00423333333 m | Imperial/US |
| picas | french; charriere | picas | french; charriere |
|---|---|---|---|
| 1 | ≈ 12.69999999 | 4 | ≈ 50.79999996 |
| 1.5 | ≈ 19.049999985 | 4.5 | ≈ 57.149999955 |
| 2 | ≈ 25.39999998 | 5 | ≈ 63.49999995 |
| 2.5 | ≈ 31.749999975 | 5.5 | ≈ 69.849999945 |
| 3 | ≈ 38.09999997 | 6 | ≈ 76.19999994 |
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 | picas | french; charriere | picas |
|---|---|---|---|
| 1 | ≈ 0.078740157542315 | 4 | ≈ 0.31496063016926 |
| 1.5 | ≈ 0.11811023631347 | 4.5 | ≈ 0.35433070894042 |
| 2 | ≈ 0.15748031508463 | 5 | ≈ 0.39370078771158 |
| 2.5 | ≈ 0.19685039385579 | 5.5 | ≈ 0.43307086648273 |
| 3 | ≈ 0.23622047262695 | 6 | ≈ 0.47244094525389 |
| picas | french; charriere |
|---|---|
| 1 | ≈ 12.7000000 |
| 0.0787402 | ≈ 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 …) |