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Convert knot to mph

Please provide values below to convert knot [kt, kn] to mile/hour [mi/h], or vice versa.



Definition: A knot (symbol: kn or kt) is a non-SI unit of speed at sea. It is defined as one nautical mile per hour, where a nautical mile is 1,852 meters. A knot is equal to 1.852 kilometers per hour and 1.15078 miles per hour.

History/origin: The term "knot" is derived from its former use as a measure on the log lines on ship logs (a navigation tool) which were used to measure ship speed through water. Knots would be tied into the rope on these lines at uniform intervals of approximately 47 feet, or 14.3 meters long.

The knot has had various definitions throughout history. The United States and United Kingdom in particular used their own specific nautical miles up until 1954 and 1970 respectively. The US nautical mile is defined as 1,853.248 m while the UK Admiralty nautical mile is equal to 1853.184 m, compared to the international nautical mile of 1,852 m.

Current use: The knot is used worldwide in meteorology as well as in maritime and air navigation as a measure of speed of a vessel relative to the fluids in which they travel. Tidal streams, river currents, and wind speeds are also measured using knots.


Definition: The unit miles per hour (symbol: mph) is a measurement of speed in the imperial and United States customary systems. It expresses the number of statute miles traveled over the period of one hour. One mph equals exactly 1.609344 kilometers per hour (km/h).

Current use: Along with km/h, mph is most typically used in relation to road traffic speeds. It is most widely used in the United States, the United Kingdom, and their related territories. It is also used in the Canadian rail system, though the Canadian road systems use km/h.

Knot to Mile/hour Conversion Table

Knot [kt, Kn]Mile/hour [mi/h]
0.01 kt, kn0.0115077945 mi/h
0.1 kt, kn0.1150779448 mi/h
1 kt, kn1.150779448 mi/h
2 kt, kn2.301558896 mi/h
3 kt, kn3.4523383441 mi/h
5 kt, kn5.7538972401 mi/h
10 kt, kn11.5077944802 mi/h
20 kt, kn23.0155889605 mi/h
50 kt, kn57.5389724012 mi/h
100 kt, kn115.0779448024 mi/h
1000 kt, kn1150.7794480235 mi/h

How to Convert Knot to Mile/hour

1 kt, kn = 1.150779448 mi/h
1 mi/h = 0.8689762419 kt, kn

Example: convert 15 kt, kn to mi/h:
15 kt, kn = 15 × 1.150779448 mi/h = 17.2616917204 mi/h

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