When you need this conversion
Marine and aviation weather, sailing and boating, flight data and wind forecasts for kiteboarding and surfing.
Quick reference
- 1 kn = 1.852 km/h
- 10 kn = 18.52 km/h
- 20 kn = 37.04 km/h
- 30 kn = 55.56 km/h
- 100 kn = 185.2 km/h
- 500 kn = 926 km/h
Wind strength
Forecasts in knots map to the Beaufort scale: 11–16 knots is a moderate breeze (20–30 km/h), 34–40 knots is a gale (63–74 km/h), and 64 knots or more is hurricane force (118.5 km/h or more).
Common mistakes
Saying “knots per hour”. A knot is already a speed.
Using a statute mile. A nautical mile (1,852 m) is 15% longer than a statute mile (1,609.344 m).
For miles per hour, use knots to mph.