| 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 |
| picometer | 333,333,333.33333 pm | 666,666,666.66667 pm | 1 000 000 000 pm | 1,333,333,333.3333 pm | 1,666,666,666.6667 pm | 2 000 000 000 pm | 2,333,333,333.3333 pm | 2,666,666,666.6667 pm | 3 000 000 000 pm | 3,333,333,333.3333 pm | 3,666,666,666.6667 pm | 4 000 000 000 pm | 4,333,333,333.3333 pm | 4,666,666,666.6667 pm | 5 000 000 000 pm | 5,333,333,333.3333 pm | 5,666,666,666.6667 pm | 6 000 000 000 pm | 6,333,333,333.3333 pm | 6,666,666,666.6667 pm | 7 000 000 000 pm | 7,333,333,333.3333 pm | 7,666,666,666.6667 pm | 8 000 000 000 pm | 8,333,333,333.3333 pm | 8,666,666,666.6667 pm | 9 000 000 000 pm | 9,333,333,333.3333 pm | 9,666,666,666.6667 pm | 10 000 000 000 pm | 10,333,333,333.333 pm | 10,666,666,666.667 pm | 11 000 000 000 pm | 11,333,333,333.333 pm | 11,666,666,666.667 pm | 12 000 000 000 pm | 12,333,333,333.333 pm | 12,666,666,666.667 pm | 13 000 000 000 pm | 13,333,333,333.333 pm | 13,666,666,666.667 pm | 14 000 000 000 pm | 14,333,333,333.333 pm | 14,666,666,666.667 pm | 15 000 000 000 pm | 15,333,333,333.333 pm | 15,666,666,666.667 pm | 16 000 000 000 pm | 16,333,333,333.333 pm | 16,666,666,666.667 pm | 17 000 000 000 pm | 17,333,333,333.333 pm | 17,666,666,666.667 pm | 18 000 000 000 pm | 18,333,333,333.333 pm | 18,666,666,666.667 pm | 19 000 000 000 pm | 19,333,333,333.333 pm | 19,666,666,666.667 pm | 20 000 000 000 pm | 20,333,333,333.333 pm | 20,666,666,666.667 pm | 21 000 000 000 pm | 21,333,333,333.333 pm | 21,666,666,666.667 pm | 22 000 000 000 pm | 22,333,333,333.333 pm | 22,666,666,666.667 pm | 23 000 000 000 pm | 23,333,333,333.333 pm | 23,666,666,666.667 pm | 24 000 000 000 pm | 24,333,333,333.333 pm | 24,666,666,666.667 pm | 25 000 000 000 pm | 25,333,333,333.333 pm | 25,666,666,666.667 pm | 26 000 000 000 pm | 26,333,333,333.333 pm | 26,666,666,666.667 pm | 27 000 000 000 pm | 27,333,333,333.333 pm | 27,666,666,666.667 pm | 28 000 000 000 pm | 28,333,333,333.333 pm | 28,666,666,666.667 pm | 29 000 000 000 pm | 29,333,333,333.333 pm | 29,666,666,666.667 pm | 30 000 000 000 pm | 30,333,333,333.333 pm | 30,666,666,666.667 pm | 31 000 000 000 pm | 31,333,333,333.333 pm | 31,666,666,666.667 pm | 32 000 000 000 pm | 32,333,333,333.333 pm | 32,666,666,666.667 pm | 33 000 000 000 pm | 33,333,333,333.333 pm |
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 | picometers | french; charriere | picometers |
|---|---|---|---|
| 1 | = 333333333.33333 | 4 | = 1333333333.3333 |
| 1.5 | = 500000000 | 4.5 | = 1500000000 |
| 2 | = 666666666.66667 | 5 | = 1666666666.6667 |
| 2.5 | = 833333333.33333 | 5.5 | = 1833333333.3333 |
| 3 | = 1000000000 | 6 | = 2000000000 |
The picometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the metric system, equal to 1×10−12 m, or one trillionth ( 1 / 1000000000000 ) of a metre, which is the SI base unit of length.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| picometer | pm | ≡ 1×10-12 m | ≡ 1×10-12 m | Metric system SI |
| picometers | french; charriere | picometers | french; charriere |
|---|---|---|---|
| 1 | = 3.0E-9 | 4 | = 1.2E-8 |
| 1.5 | = 4.5E-9 | 4.5 | = 1.35E-8 |
| 2 | = 6.0E-9 | 5 | = 1.5E-8 |
| 2.5 | = 7.5E-9 | 5.5 | = 1.65E-8 |
| 3 | = 9.0E-9 | 6 | = 1.8E-8 |
| french; charriere | picometers |
|---|---|
| 1 | = 333,333,333.33333 |
| 3.0 × 10-9 | = 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 …) |