| 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 |
| rod | 6.6279593838649 × 10-5 rd | 0.0001326 rd | 0.0001988 rd | 0.0002651 rd | 0.0003314 rd | 0.0003977 rd | 0.0004640 rd | 0.0005302 rd | 0.0005965 rd | 0.0006628 rd | 0.0007291 rd | 0.0007954 rd | 0.0008616 rd | 0.0009279 rd | 0.0009942 rd | 0.0010605 rd | 0.0011268 rd | 0.0011930 rd | 0.0012593 rd | 0.0013256 rd | 0.0013919 rd | 0.0014582 rd | 0.0015244 rd | 0.0015907 rd | 0.0016570 rd | 0.0017233 rd | 0.0017895 rd | 0.0018558 rd | 0.0019221 rd | 0.0019884 rd | 0.0020547 rd | 0.0021209 rd | 0.0021872 rd | 0.0022535 rd | 0.0023198 rd | 0.0023861 rd | 0.0024523 rd | 0.0025186 rd | 0.0025849 rd | 0.0026512 rd | 0.0027175 rd | 0.0027837 rd | 0.0028500 rd | 0.0029163 rd | 0.0029826 rd | 0.0030489 rd | 0.0031151 rd | 0.0031814 rd | 0.0032477 rd | 0.0033140 rd | 0.0033803 rd | 0.0034465 rd | 0.0035128 rd | 0.0035791 rd | 0.0036454 rd | 0.0037117 rd | 0.0037779 rd | 0.0038442 rd | 0.0039105 rd | 0.0039768 rd | 0.0040431 rd | 0.0041093 rd | 0.0041756 rd | 0.0042419 rd | 0.0043082 rd | 0.0043745 rd | 0.0044407 rd | 0.0045070 rd | 0.0045733 rd | 0.0046396 rd | 0.0047059 rd | 0.0047721 rd | 0.0048384 rd | 0.0049047 rd | 0.0049710 rd | 0.0050372 rd | 0.0051035 rd | 0.0051698 rd | 0.0052361 rd | 0.0053024 rd | 0.0053686 rd | 0.0054349 rd | 0.0055012 rd | 0.0055675 rd | 0.0056338 rd | 0.0057000 rd | 0.0057663 rd | 0.0058326 rd | 0.0058989 rd | 0.0059652 rd | 0.0060314 rd | 0.0060977 rd | 0.0061640 rd | 0.0062303 rd | 0.0062966 rd | 0.0063628 rd | 0.0064291 rd | 0.0064954 rd | 0.0065617 rd | 0.0066280 rd |
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 | rods | french; charriere | rods |
|---|---|---|---|
| 1 | = 6.6279593838649E-5 | 4 | = 0.0002651183753546 |
| 1.5 | = 9.9419390757973E-5 | 4.5 | = 0.00029825817227392 |
| 2 | = 0.0001325591876773 | 5 | = 0.00033139796919324 |
| 2.5 | = 0.00016569898459662 | 5.5 | = 0.00036453776611257 |
| 3 | = 0.00019883878151595 | 6 | = 0.00039767756303189 |
The rod or perch or pole is a surveyors tool and unit of length equal to 5 1⁄2 yards, 16 1⁄2 feet, 1⁄320 of a statute mile or one-fourth of a surveyor's chain and 5.0292 meters.
| Name of unit | Symbol | Definition | Relation to SI units | Unit System |
|---|---|---|---|---|
| rod | rd | ≡ 16 1⁄2 ft | = 5.0292 m | Imperial/US |
| rods | french; charriere | rods | french; charriere |
|---|---|---|---|
| 1 | = 15087.6 | 4 | = 60350.4 |
| 1.5 | = 22631.4 | 4.5 | = 67894.2 |
| 2 | = 30175.2 | 5 | = 75438 |
| 2.5 | = 37719 | 5.5 | = 82981.8 |
| 3 | = 45262.8 | 6 | = 90525.6 |
| french; charriere | rods |
|---|---|
| 1 | = 6.6279593838649 × 10-5 |
| 15,087.6 | = 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 …) |