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Convert mph to knot

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

From: mile/hour
To: knot


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.


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.

Mile/hour to Knot Conversion Table

Mile/hour [mi/h]Knot [kt, Kn]
0.01 mi/h0.0086897624 kt, kn
0.1 mi/h0.0868976242 kt, kn
1 mi/h0.8689762419 kt, kn
2 mi/h1.7379524838 kt, kn
3 mi/h2.6069287257 kt, kn
5 mi/h4.3448812095 kt, kn
10 mi/h8.689762419 kt, kn
20 mi/h17.379524838 kt, kn
50 mi/h43.448812095 kt, kn
100 mi/h86.8976241901 kt, kn
1000 mi/h868.9762419006 kt, kn

How to Convert Mile/hour to Knot

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

Example: convert 15 mi/h to kt, kn:
15 mi/h = 15 × 0.8689762419 kt, kn = 13.0346436285 kt, kn

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