| 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 |
| pica | 0.0787402 pica | 0.1574803 pica | 0.2362205 pica | 0.3149606 pica | 0.3937008 pica | 0.4724409 pica | 0.5511811 pica | 0.6299213 pica | 0.7086614 pica | 0.7874016 pica | 0.8661417 pica | 0.9448819 pica | 1.0236220 pica | 1.1023622 pica | 1.1811024 pica | 1.2598425 pica | 1.3385827 pica | 1.4173228 pica | 1.4960630 pica | 1.5748032 pica | 1.6535433 pica | 1.7322835 pica | 1.8110236 pica | 1.8897638 pica | 1.9685039 pica | 2.0472441 pica | 2.1259843 pica | 2.2047244 pica | 2.2834646 pica | 2.3622047 pica | 2.4409449 pica | 2.5196850 pica | 2.5984252 pica | 2.6771654 pica | 2.7559055 pica | 2.8346457 pica | 2.9133858 pica | 2.9921260 pica | 3.0708661 pica | 3.1496063 pica | 3.2283465 pica | 3.3070866 pica | 3.3858268 pica | 3.4645669 pica | 3.5433071 pica | 3.6220472 pica | 3.7007874 pica | 3.7795276 pica | 3.8582677 pica | 3.9370079 pica | 4.0157480 pica | 4.0944882 pica | 4.1732283 pica | 4.2519685 pica | 4.3307087 pica | 4.4094488 pica | 4.4881890 pica | 4.5669291 pica | 4.6456693 pica | 4.7244095 pica | 4.8031496 pica | 4.8818898 pica | 4.9606299 pica | 5.0393701 pica | 5.1181102 pica | 5.1968504 pica | 5.2755906 pica | 5.3543307 pica | 5.4330709 pica | 5.5118110 pica | 5.5905512 pica | 5.6692913 pica | 5.7480315 pica | 5.8267717 pica | 5.9055118 pica | 5.9842520 pica | 6.0629921 pica | 6.1417323 pica | 6.2204724 pica | 6.2992126 pica | 6.3779528 pica | 6.4566929 pica | 6.5354331 pica | 6.6141732 pica | 6.6929134 pica | 6.7716535 pica | 6.8503937 pica | 6.9291339 pica | 7.0078740 pica | 7.0866142 pica | 7.1653543 pica | 7.2440945 pica | 7.3228347 pica | 7.4015748 pica | 7.4803150 pica | 7.5590551 pica | 7.6377953 pica | 7.7165354 pica | 7.7952756 pica | 7.8740158 pica |
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 |
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 |
| french; charriere | picas |
|---|---|
| 1 | ≈ 0.0787402 |
| 12.7000000 | ≈ 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 …) |