A knot is a unit of speed equal to one nautical mile per hour.

Quick Scoop

  • 1 knot ≈ 1.852 km/h.
  • 1 knot ≈ 1.15 miles per hour.
  • In metres per second, 1 knot ≈ 0.51 m/s.

So if a boat is going 10 knots, that’s about 18.5 km/h or 11.5 mph, and 20 knots is about 37 km/h or 23 mph.