UnitConvConvert
Speed

Convert miles per hour to knots

1 mph=0.869kn

Use the converter below to change any miles per hour value into knots instantly — with formula, conversion table, and real-world examples.

0.86898

Conversion formula

Forward
knots = miles per hour × 0.869
Reverse
miles per hour = knots × 1.15078

Example: 10 mph × 0.869 = 8.68976 kn.

About both units

From

Mile per Hour

mph

Miles per hour (mph) is the standard road-speed unit in the US, UK and a few other countries. US highways typically 65–75 mph; UK motorways 70 mph. US weather reports wind speed in mph, while meteorologists also use knots.

Real-world: US interstate: 70 mph typical. UK motorway: 70 mph limit. Cycling pro speed: 25 mph. Tornado winds: 110+ mph.
Read full mile per hour reference →
To

Knot

kn

The knot equals one nautical mile per hour — 1.852 km/h. It is the international standard in marine navigation and aviation. Commercial airliners cruise at 450–500 knots. Sailboats in light breeze: 2–6 knots.

Real-world: Airbus A380 cruise: ~490 knots. Cruise ship: 20 knots. Sailing yacht: 6 knots typical.
Read full knot reference →

Mile per Hour to Knot conversion table

Common miles per hour to knots values for quick reference.

Mile per Hour (mph)Knot (kn)
1 mph0.869 kn
5 mph4.34488 kn
10 mph8.68976 kn
25 mph21.7244 kn
50 mph43.4488 kn
100 mph86.8976 kn
150 mph130.346 kn
200 mph173.795 kn
300 mph260.693 kn
500 mph434.488 kn

Tips & common mistakes

Quick tips

  • 1 mph = 1.609 km/h = 0.447 m/s.
  • Quick convert: mph × 1.6 = km/h.
  • UK speeds posted in mph on road signs despite general metrication.

Avoid these

  • Reading a UK road sign "50" as km/h — it's mph (= 80 km/h).
  • Converting mph to km/h by multiplying by 1.5 instead of 1.609 — 7% error.
  • Assuming "mph" and "MPH" differ — capitalisation does not matter.

Frequently asked questions

How many knots in a mile per hour?
One mile per hour equals 0.869 knots.
How do I convert miles per hour to knots?
Multiply the mile per hour value by 0.869 to get the equivalent in knots.
What is 100 miles per hour in knots?
100 miles per hour equals 86.8976 knots.
Is a mile per hour bigger than a knot?
No. 1 mile per hour equals 0.869 knots, so one mile per hour is smaller.
How to convert miles per hour to knots without a calculator?
Multiply by 0.87 for a quick estimate; use a calculator for precise results.

Related speed conversions

📊 See full comparison matrix →

More from Mile per Hour

mph → km/h
1 = 1.60934 km/h
mph → m/s
1 = 0.447 m/s
mph → Ma
1 = 0.001314 Ma
mph → ft/s
1 = 1.46667 ft/s
mph → cm/s
1 = 44.704 cm/s
mph → yd/min
1 = 29.3333 yd/min
mph → in/min
1 = 1,056.83 in/min
mph → Bft
1 = 0.447 Bft

More to Knot

km/h → kn
1 = 0.54 kn
m/s → kn
1 = 1.94384 kn
Ma → kn
1 = 661.471 kn
ft/s → kn
1 = 0.5925 kn
cm/s → kn
1 = 0.01944 kn
yd/min → kn
1 = 0.02962 kn
in/min → kn
1 = 0.0008222 kn
Bft → kn
1 = 1.94384 kn

Conversions in other categories

WeightKilogram → PoundLengthKilometer → MileTemperatureCelsius → FahrenheitVolumeLiter → US GallonAreaSquare Meter → Square FootEnergyKilojoule → KilocaloriePressureBar → Pound per Square InchPowerKilowatt → Mechanical Horsepower