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A knot is one nautical mile per hour (1 knot = 1.15 miles per hour). The term knot dates from the 17th century, when sailors measured the speed of their ship by using a device called a common log.. This device was a coil of rope with uniformly spaced knots, attached to a piece of wood shaped like a slice of pie.
Slightly greater than 1.15mph   A knot, or nautical mile (6076 feet), is about 15% longer than a statute mile (5280). So, if you're traveling at a speed of 20 knots in a moâ¦tor boat, you simply multiply 20 X 1.15 to get 23 mph. To go from mph to knots, multiply mph by about .87 to get knots. One Knot = 1.1507794 MPH (sailors would say 1.15) One MPH = 0. 86897624 Knots (sailors would say 0. A knot, or nautical mile (6076 feet), is about 15% longer than a statute mile (5280). So, if you're traveling at a speed of 20 knots in a motor boat, you simply multiply 20 X 1.15 to get 23 mph. To go from mph to knots, multiply mph by about .87 to get knots.