There are 1.15 mph in one knot. A knot is a unit of measurement used to represent the speed of aircraft or watercraft, whereas miles per hour are a unit of measurement used to represent the speed of cars and other land-based vehicles.
According to National Aeronautics and Space Administration, one knot is equal to one nautical mile per hour, which is equal to 6,076 feet per hour. One standard mile per hour is equal to 5,280 feet per hour. The nautical mile is slightly longer than the standard mile because it was created based on the longitude of the earth.