Knots to MPH Converter
A knot is one nautical mile an hour. This converts a speed in knots into miles per hour, so a boat or aircraft speed can be compared with a car's.
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How it works
One knot is one nautical mile per hour. A nautical mile is longer than a road mile, so a knot is a larger unit than a mile per hour.
To get miles per hour, multiply knots by about 1.15. Change the speed and the result follows.
Worked example
A speed of 10 kn knots is 11.5 mph miles per hour.
Questions
Why is a knot not the same as a mile per hour?
A knot is based on nautical miles, which are longer than road miles, so the same number of knots covers more ground.
What is a knot in kilometres per hour?
One knot is about 1.85 kilometres per hour.
Can this replace a weather or marine chart?
No. It only does the unit arithmetic. Forecasts and charts give their own speeds, and those are what planning should use.
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