One knot is exactly 1.852 km/h (1.1508 mph), so a 30-knot wind is 55.6 km/h.
| Knots (kn) | Kilometers per hour (km/h) |
|---|---|
| 5 | 9.3 |
| 10 | 18.5 |
| 15 | 27.8 |
| 20 | 37.0 |
| 25 | 46.3 |
| 30 | 55.6 |
| 35 | 64.8 |
| 40 | 74.1 |
| 45 | 83.3 |
| 50 | 92.6 |
| 55 | 101.9 |
| 60 | 111.1 |
| 65 | 120.4 |
| 70 | 129.6 |
| 75 | 138.9 |
| 80 | 148.2 |
| 85 | 157.4 |
| 90 | 166.7 |
| 95 | 175.9 |
| 100 | 185.2 |
| 105 | 194.5 |
| 110 | 203.7 |
| 115 | 213.0 |
| 120 | 222.2 |
| 125 | 231.5 |
| 130 | 240.8 |
| 135 | 250.0 |
| 140 | 259.3 |
| 145 | 268.5 |
| 150 | 277.8 |
| 155 | 287.1 |
| 160 | 296.3 |
| 165 | 305.6 |
| 170 | 314.8 |
| 175 | 324.1 |
| 180 | 333.4 |
| 185 | 342.6 |
| 190 | 351.9 |
| 195 | 361.1 |
| 200 | 370.4 |
How it is computed
km/h = knots × 1.852. The international nautical mile is defined as exactly 1,852 m, and a knot is one nautical mile per hour.
FAQ
Why do sailors and pilots use knots?+
A nautical mile is about one minute of latitude, so distances on a chart convert straight into travel time.
How do I convert knots to mph?+
Multiply knots by about 1.1508.