| spat | 1 S | 2 S | 3 S | 4 S | 5 S | 6 S | 7 S | 8 S | 9 S | 10 S | 11 S | 12 S | 13 S | 14 S | 15 S | 16 S | 17 S | 18 S | 19 S | 20 S | 21 S | 22 S | 23 S | 24 S | 25 S | 26 S | 27 S | 28 S | 29 S | 30 S | 31 S | 32 S | 33 S | 34 S | 35 S | 36 S | 37 S | 38 S | 39 S | 40 S | 41 S | 42 S | 43 S | 44 S | 45 S | 46 S | 47 S | 48 S | 49 S | 50 S | 51 S | 52 S | 53 S | 54 S | 55 S | 56 S | 57 S | 58 S | 59 S | 60 S | 61 S | 62 S | 63 S | 64 S | 65 S | 66 S | 67 S | 68 S | 69 S | 70 S | 71 S | 72 S | 73 S | 74 S | 75 S | 76 S | 77 S | 78 S | 79 S | 80 S | 81 S | 82 S | 83 S | 84 S | 85 S | 86 S | 87 S | 88 S | 89 S | 90 S | 91 S | 92 S | 93 S | 94 S | 95 S | 96 S | 97 S | 98 S | 99 S | 100 S |
| french; charriere | 3.0 × 1015 F | 6.0 × 1015 F | 9.0 × 1015 F | 1.2 × 1016 F | 1.5 × 1016 F | 1.8 × 1016 F | 2.1 × 1016 F | 2.4 × 1016 F | 2.7 × 1016 F | 3.0 × 1016 F | 3.3 × 1016 F | 3.6 × 1016 F | 3.9 × 1016 F | 4.2 × 1016 F | 4.5 × 1016 F | 4.8 × 1016 F | 5.1 × 1016 F | 5.4 × 1016 F | 5.7 × 1016 F | 6.0 × 1016 F | 6.3 × 1016 F | 6.6 × 1016 F | 6.9 × 1016 F | 7.2 × 1016 F | 7.5 × 1016 F | 7.8 × 1016 F | 8.1 × 1016 F | 8.4 × 1016 F | 8.7 × 1016 F | 9.0 × 1016 F | 9.3 × 1016 F | 9.6 × 1016 F | 9.9 × 1016 F | 1.02 × 1017 F | 1.05 × 1017 F | 1.08 × 1017 F | 1.11 × 1017 F | 1.14 × 1017 F | 1.17 × 1017 F | 1.2 × 1017 F | 1.23 × 1017 F | 1.26 × 1017 F | 1.29 × 1017 F | 1.32 × 1017 F | 1.35 × 1017 F | 1.38 × 1017 F | 1.41 × 1017 F | 1.44 × 1017 F | 1.47 × 1017 F | 1.5 × 1017 F | 1.53 × 1017 F | 1.56 × 1017 F | 1.59 × 1017 F | 1.62 × 1017 F | 1.65 × 1017 F | 1.68 × 1017 F | 1.71 × 1017 F | 1.74 × 1017 F | 1.77 × 1017 F | 1.8 × 1017 F | 1.83 × 1017 F | 1.86 × 1017 F | 1.89 × 1017 F | 1.92 × 1017 F | 1.95 × 1017 F | 1.98 × 1017 F | 2.01 × 1017 F | 2.04 × 1017 F | 2.07 × 1017 F | 2.1 × 1017 F | 2.13 × 1017 F | 2.16 × 1017 F | 2.19 × 1017 F | 2.22 × 1017 F | 2.25 × 1017 F | 2.28 × 1017 F | 2.31 × 1017 F | 2.34 × 1017 F | 2.37 × 1017 F | 2.4 × 1017 F | 2.43 × 1017 F | 2.46 × 1017 F | 2.49 × 1017 F | 2.52 × 1017 F | 2.55 × 1017 F | 2.58 × 1017 F | 2.61 × 1017 F | 2.64 × 1017 F | 2.67 × 1017 F | 2.7 × 1017 F | 2.73 × 1017 F | 2.76 × 1017 F | 2.79 × 1017 F | 2.82 × 1017 F | 2.85 × 1017 F | 2.88 × 1017 F | 2.91 × 1017 F | 2.94 × 1017 F | 2.97 × 1017 F | 3.0 × 1017 F |
The spat (symbol S) is also an obsolete unit of distance used in astronomy. It is equal to 1000000000 kilometres (1 Tm or 1012 m). It is about 6.6846 astronomical units (AU), 1.057×10−4 light-years or3.240×10−5 parsecs.
| 1 spats = 3.0E+15 french; charriere | 4 spats = 1.2E+16 french; charriere |
| 1.5 spats = 4.5E+15 french; charriere | 4.5 spats = 1.35E+16 french; charriere |
| 2 spats = 6.0E+15 french; charriere | 5 spats = 1.5E+16 french; charriere |
| 2.5 spats = 7.5E+15 french; charriere | 5.5 spats = 1.65E+16 french; charriere |
| 3 spats = 9.0E+15 french; charriere | 6 spats = 1.8E+16 french; charriere |
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).
| 1 french; charriere = 3.3333333333333E-16 spats | 4 french; charriere = 1.3333333333333E-15 spats |
| 1.5 french; charriere = 5.0E-16 spats | 4.5 french; charriere = 1.5E-15 spats |
| 2 french; charriere = 6.6666666666667E-16 spats | 5 french; charriere = 1.6666666666667E-15 spats |
| 2.5 french; charriere = 8.3333333333333E-16 spats | 5.5 french; charriere = 1.8333333333333E-15 spats |
| 3 french; charriere = 1.0E-15 spats | 6 french; charriere = 2.0E-15 spats |
| 1 spats = 3.0 × 1015 french; charriere |
| 1 french; charriere = 3.3333333333333 × 10-16 spats |