How to convert miles per hour to knots
Formula: kn = mph × 0.868976
Worked example: 65 mph → 65 × 0.868976 = 56.4835 kn
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.
Miles per hour to knots conversion chart
| Miles per hour (mph) | Knots (kn) |
|---|---|
| 5 mph | 4.34488 kn |
| 10 mph | 8.68976 kn |
| 15 mph | 13.0346 kn |
| 20 mph | 17.3795 kn |
| 25 mph | 21.7244 kn |
| 30 mph | 26.0693 kn |
| 35 mph | 30.4142 kn |
| 40 mph | 34.759 kn |
| 45 mph | 39.1039 kn |
| 50 mph | 43.4488 kn |
| 55 mph | 47.7937 kn |
| 60 mph | 52.1386 kn |
| 65 mph | 56.4835 kn |
| 70 mph | 60.8283 kn |
| 75 mph | 65.1732 kn |
| 80 mph | 69.5181 kn |
| 100 mph | 86.8976 kn |
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.
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.