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Knots to KM/H Converter

Convert knots to kilometers per hour instantly, with a reference table for wind, aviation and marine speeds.

Knots to KMH Converter

1 kn = 1.852 km/h

Multiply knots by 1.852 to get kilometers per hour.

The link carries the values you entered, so whoever opens it sees the same result. Nothing is stored on our side — the numbers travel in the link itself.

Knots to kilometers per hour reference table

The conversions people look up most often, rounded to 4 decimal places.

Common knots to kilometers per hour conversions
Knot (kn)Kilometer per hour (km/h)
1 kn1.852 km/h
5 kn9.26 km/h
10 kn18.52 km/h
15 kn27.78 km/h
20 kn37.04 km/h
25 kn46.3 km/h
30 kn55.56 km/h
40 kn74.08 km/h
50 kn92.6 km/h
64 kn118.528 km/h
100 kn185.2 km/h
300 kn555.6 km/h
500 kn926 km/h

The knots people look up most

1 kn = 1.852 km/h
One nautical mile per hour, which is the definition rather than a conversion.
10 kn = 18.52 km/h
A pleasant sailing breeze, and about the speed a large ship manoeuvres at.
20 kn = 37.04 km/h
Whitecaps everywhere, and the cruising speed of a container ship.
34 kn = 62.968 km/h
Gale force - the threshold at which forecasters issue a gale warning.
64 kn = 118.528 km/h
Hurricane force on the Beaufort scale.
470 kn = 870.44 km/h
An airliner at cruising altitude, where thin air makes the speed efficient.

How the knots to kmh calculation works

A knot is one nautical mile per hour, and a nautical mile is exactly 1.852 km:

km/h = knots × 1.852

This is the cleanest of the speed conversions, because the underlying nautical mile was defined as 1,852 metres exactly in 1929. No rounding enters anywhere.

The Beaufort scale, still used in marine forecasts, is defined in knots:

Force Knots km/h Description
4 11–16 20–30 Moderate breeze
6 22–27 41–50 Strong breeze
8 34–40 63–74 Gale
10 48–55 89–102 Storm
12 64+ 118+ Hurricane force

Most European marine forecasts give wind in knots and land forecasts in km/h, so the same weather system is described in two units depending on which side of the coast you are on.

Other everyday figures:

  • 10 knots → 18.5 km/h — a comfortable sailing breeze
  • 20 knots → 37.0 km/h — a fast cruising yacht
  • 140 knots → 259.3 km/h — airliner approach speed
  • 470 knots → 870.4 km/h — airliner cruise

The mental shortcut is double it and take off 7%: 20 knots → 40 → 37.2, against a true 37.04. Or just double for a fast upper bound.

Aviation keeps knots worldwide, including in fully metric countries, because international air navigation standardised on them and a change would be more dangerous than the inconsistency.

Frequently asked questions

Is a knot the same thing as a nautical mile?

No. A knot is a speed and a nautical mile is a distance; one knot is one nautical mile per hour. "Knots per hour" is a common slip that would describe acceleration instead. The name comes from the knots tied in a chip log line, which crews counted against a sandglass to read their speed.

What wind speed is dangerous for a small boat?

Forecasters issue a small craft advisory around 20 to 25 knots, a gale warning at 34 and a storm warning at 48. Those thresholds concern sea state as much as wind: 25 knots blowing over a long fetch builds waves that matter far more to a small hull than the wind itself does.

How fast does an airliner fly in knots?

Around 450 to 500 knots of true airspeed at cruising altitude, and roughly 130 to 150 on approach. Light aircraft cruise between 100 and 150. Aviation kept the unit for the same reason shipping did: charts, navigation and flight planning are all worked in nautical miles.

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Further reading