| Bft | kn | km/h | m/s |
|---|---|---|---|
| 0 | 0 | 0 | 0.0 - 0.2 |
| 1 | 1 - 3 | 1 - 5 | 0.3 - 1.5 |
| 2 | 4 - 6 | 6 - 11 | 1.6 - 3.3 |
| 3 | 7 - 10 | 12 - 19 | 3.4 - 5.4 |
| 4 | 11 - 15 | 20 - 28 | 5.5 - 7.9 |
| 5 | 16 - 21 | 29 - 38 | 8.0 - 10.7 |
| 6 | 22 - 27 | 39 - 49 | 10.8 - 13.8 |
| 7 | 28 - 33 | 50 - 61 | 13.9 - 17.1 |
| 8 | 34 - 40 | 62 - 74 | 17.2 - 20.7 |
| 9 | 41 - 47 | 75 - 88 | 20.8 - 24.4 |
| 10 | 48 - 55 | 89 - 102 | 24.5 - 28.4 |
| 11 | 56 - 63 | 103 - 117 | 28.5 - 32.6 |
| 12 | 64 - | 118 - | 32.7 - |