How to convert knots to miles per hour
Formula: mph = kn × 1.15078
Worked example: 20 kn → 20 × 1.15078 = 23.0156 mph
One knot is about 1.15078 mph. Hurricane categories are often given in both: the 64 knot threshold for a hurricane is about 74 mph.
Knots to miles per hour conversion chart
| Knots (kn) | Miles per hour (mph) |
|---|---|
| 1 kn | 1.15078 mph |
| 5 kn | 5.7539 mph |
| 10 kn | 11.5078 mph |
| 15 kn | 17.2617 mph |
| 20 kn | 23.0156 mph |
| 25 kn | 28.7695 mph |
| 30 kn | 34.5234 mph |
| 40 kn | 46.0312 mph |
| 50 kn | 57.539 mph |
| 100 kn | 115.078 mph |
| 150 kn | 172.617 mph |
| 200 kn | 230.156 mph |
| 250 kn | 287.695 mph |
| 300 kn | 345.234 mph |
| 450 kn | 517.851 mph |
| 500 kn | 575.39 mph |
What is a knot?
The knot is one nautical mile per hour, exactly 1.852 km/h or about 1.15 mph. Ships, aircraft and marine weather forecasts use it worldwide. The name comes from sailors counting knots on a line paid out behind the ship.
What is a mile per hour?
The mile per hour is the unit of speed limits in the United States and the United Kingdom. Since a mile is exactly 1.609344 km, 1 mph is exactly 1.609344 km/h. Baseball pitches, wind speeds in US forecasts and treadmill displays also use mph.