Convert miles per hour to knots

Enter the number of miles per hour you want to convert to knots in the text box below. The conversion to speed in knots will update as you type.

Answer: 0.869
miles per hour (mph)
1 miles per hour = 0.869 knots

Precise decimal and fraction answers

The conversion in knots rounded to six significant decimal places is 1 mph = 0.868976 kn. The precise fraction answer is 577/664 kn.

Decimal Precision

Conversion from one to ten decimal places

  • 1 mph = 0.9 kn
  • 1 mph = 0.87 kn
  • 1 mph = 0.869 kn
  • 1 mph = 0.8690 kn
  • 1 mph = 0.86898 kn
  • 1 mph = 0.868976 kn
  • 1 mph = 0.8689762 kn
  • 1 mph = 0.86897624 kn
  • 1 mph = 0.868976242 kn
  • 1 mph = 0.8689762419 kn

How many knots is a mile per hour?

A mile per hour is slower than a knot. 0.869 knots is the same velocity as one mile per hour. A mile per hour is 86.90% the velocity a knot. An object moving at a knot is 15.08% faster than an object traveling at one mile per hour.

Miles per hour to knots conversion factor and formulas


The conversion factor between miles per hour and knots is 1.151. This represents the ratio of miles per hour per one knot. To calculate the value in knots, we can either divide by the conversion factor or multiply by its inverse.


To convert from miles per hour to knots, divide miles per hour by 1.151.
The formula is expressed as:
mph ÷ 1.151 = kn


Alternatively we can multiply by the inverse conversion factor to get the same result.
The inverse of 1.151 is 1/1.151 or 0.869. To convert from miles per hour to knots, multiply miles per hour by 0.869.
The formula is expressed as:
mph × 0.869 = kn

About this conversion

When converting from from miles per hour to knots, both units are within the US Customary / UK Imperial system and conversion factors are governed by standards set by the controlling body.

About Miles per hour

Customary/Imperial Unit

Miles per hour is a velocity measurement within the US/UK Imperial systems. It is defined as the number of miles traveled in one hour. MPH is frequently used for measurement and regulation of vehicle speed limits in the US, UK and many British dependencies. The common symbols for miles per hour are mph, MPH or mi/hr.

About Knots

Customary/Imperial Unit

Knots are a measure of speed over long geographic distances most often associated with the maritime and aviation communities. A knot is a measurement of distance traveled in nautical miles in one hour. The origins of the knot derive from practice of mariners throwing a wooden chip log attached to a line off the stern of a ship. As the ship traveled forward, the line spooled out and the number of physical knots on the line where counted over a 30 second period to determine boat speed. The symbol for knots is either kn or kt.

Reverse this conversion

Convert from knots to miles per hour instead.

1 miles per hour to other speed units


  • 1 mph = 1.609 km/h


  • 1 mph = 1 mph
  • 1 mph = 0.869 kn

References and Citations

  1. National Institute of Standards and Technology (NIST) General Tables of Units of Measurement

Miles per hour to knots conversion table

mph kn
1 mph 0.869 kn
2 mph 1.738 kn
3 mph 2.607 kn
4 mph 3.476 kn
5 mph 4.345 kn
6 mph 5.214 kn
7 mph 6.083 kn
8 mph 6.952 kn
9 mph 7.821 kn
10 mph 8.69 kn
mph kn
20 mph 17.38 kn
30 mph 26.069 kn
40 mph 34.759 kn
50 mph 43.449 kn
60 mph 52.139 kn
70 mph 60.828 kn
80 mph 69.518 kn
90 mph 78.208 kn
100 mph 86.898 kn
1,000 mph 868.976 kn

More mph to kn conversions

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