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Convert km/h to knots

1 kilometer per hour equals 0.5399568 knots. Enter a value below to convert instantly.

Kilometres per hour to knots is the conversion you need when a land-based weather forecast or a vehicle specification has to be read against a marine or aviation figure. Divide by 1.852; 100 km/h is 54 knots.

1 km/h
0.5399568 kn

Multiply the number of kilometers per hour by 0.539956803456 to get knots. How this is calculated

Copy link puts your number after the #, which browsers never send to a server — but the link itself carries it, so anyone you send it to sees the value. Save keeps the unit pair in this browser only; clear it any time from your saved list.

Need the other direction? Convert knot to kilometer per hour →

Formula

Multiply the number of kilometers per hour by 0.539956803456 to get knots.

Step by step

  1. Start with 1 km/h.
  2. Multiply by the conversion factor 0.539956803456.
  3. 1 × 0.539956803456 = 0.5399568 kn.

Kilometers per Hour to Knots conversion table

Kilometers per Hour (km/h) Knots (kn)
1 0.5399568
5 2.699784
10 5.399568
20 10.799136
30 16.198704
40 21.598272
50 26.99784
60 32.397408
80 43.196544
100 53.99568

Where kilometers per hour and knots are used together

Marine navigation

Boat speed, current and wind are all in knots, and a chart's latitude scale doubles as its distance scale. Converting to km/h is mainly for comparison with land speeds rather than for navigation itself.

Aviation

Airspeed and wind are in knots worldwide while altitude is in feet and visibility is often in metres — a genuinely mixed-unit environment. Ground speed in knots converts to km/h for comparison with surface travel times.

Wind and storm reporting

Meteorological agencies publish sustained winds in knots, and hurricane categories are defined with all three units side by side. A Category 1 hurricane starts at 64 knots, 74 mph or 119 km/h.

Weather routing and sailing performance

Polar diagrams give boat speed in knots against true wind speed in knots. Converting either axis to km/h breaks the comparison with published data, so the conversion is usually for presentation rather than calculation.

Everyday kilometers per hour worth knowing

Values people actually look up, with the reason each one comes up. Every figure is calculated with the same engine as the converter above.

Kilometer per Hour (km/h) Knot (kn) What it is
10 5.399568 A slow cruise
20 10.799136 A harbour speed limit
50 26.99784 A road speed for comparison
63 34.017279 Gale-force wind threshold
100 53.99568 A round figure
119 64.25486 Hurricane-force wind threshold
500 269.9784 An airliner's approach speed range
900 485.96112 An airliner's cruise speed

How these two units are defined

The nautical mile was defined as one minute of arc of latitude along a meridian, which is why it maps directly onto navigational charts: one minute of latitude is one nautical mile, everywhere. In 1929 it was standardised at exactly 1,852 m. A knot is one nautical mile per hour. Because the definition ties distance to angle, a course plotted on a chart can be measured in nautical miles with a pair of dividers against the latitude scale — the practical reason the unit has survived alongside the metric system.

Rounding and precision

1.852 is exact by definition, so the conversion is clean. Wind and vessel speeds are rarely known better than the nearest knot, so one decimal place is generous and two is false precision. Note that aviation and marine instruments report several different speeds — indicated, true and ground — and converting the units does not turn one into another.

Mistakes people make with this conversion

  • Saying 'knots per hour'

    A knot already is a speed — one nautical mile per hour. 'Knots per hour' would be an acceleration.

  • Using the statute mile factor

    Converting knots with 1.609 instead of 1.852 understates the speed by about 13%. The nautical mile is a different unit from the statute mile.

  • Confusing indicated and true airspeed

    Indicated airspeed diverges from true airspeed with altitude. A unit conversion changes neither into the other; that is a separate aerodynamic calculation.

Read more about these units

Sources for this page

  1. Special Publication 811 — Guide for the Use of the International System of Units (SI) NIST (US National Institute of Standards and Technology) · Conversion factors between US customary and SI units, and the rounding and significant-figure conventions this site follows.
  2. Saffir-Simpson Hurricane Wind Scale NOAA National Hurricane Center · A worked example of the same wind speed published simultaneously in mph, knots, and km/h.

Content on this page last reviewed 12 August 2026. Spotted an error? Report it — see also how these values are calculated.

Convert Kilometer per Hour to other speed units

1 km/h expressed in every other speed unit on this site.

  • Meter per Second m/s 0.27777778
  • Kilometer per Minute km/min 0.016666667
  • Kilometer per Second km/s 0.00027777778
  • Meter per Minute m/min 16.666667
  • Meter per Hour m/h 1,000
  • Centimeter per Second cm/s 27.777778
  • Centimeter per Minute cm/min 1,666.6667
  • Centimeter per Hour cm/h 100,000
  • Millimeter per Second mm/s 277.77778
  • Millimeter per Minute mm/min 16,666.667
  • Millimeter per Hour mm/h 1,000,000
  • Mile per Hour mph 0.62137119
  • Mile per Minute mi/min 0.010356187
  • Mile per Second mi/s 0.00017260311
  • Yard per Hour yd/h 1,093.6133
  • Yard per Minute yd/min 18.226888
  • Yard per Second yd/s 0.30378147
  • Foot per Hour ft/h 3,280.8399
  • Foot per Minute ft/min 54.680665
  • Foot per Second ft/s 0.91134442
  • Inch per Second in/s 10.936133
  • Inch per Minute in/min 656.16798
  • Inch per Hour in/h 39,370.079
  • Knot kn 0.5399568
  • Knot (UK) kn (UK) 0.53961182
  • Mach (sea level) M 0.00081629721
  • Mach (SI standard) M (SI) 0.0009414715
  • Mach (20 °C, 1 atm) M (20 °C) 0.00080843358
  • Speed of Sound (pure water) c (H₂O) 0.00018734591
  • Speed of Sound (sea water) c (sea) 0.00018255637
  • Speed of Light (vacuum) c 9.2656693e-10
  • Cosmic Velocity (first) v₁ 0.000035161744
  • Cosmic Velocity (second) v₂ 0.000024801587
  • Cosmic Velocity (third) v₃ 0.000016663334
  • Earth's Orbital Velocity v⊕ 0.0000093323628

About the kilometer per hour

The kilometer per hour (km/h) is a Metric unit of speed.

About the knot

The knot (kn) is a Other unit of speed. One nautical mile per hour — the standard unit for marine and air navigation.

Related conversions

Frequently asked questions

What is 100 km/h in knots?

100 km/h is 53.996 knots — near enough to 54 for any practical purpose.

Is a knot the same as a mile per hour?

No. A knot is 1.852 km/h and a statute mph is 1.609344 km/h, so a knot is about 15% faster. A 20-knot wind is 23 mph.

How do I convert a wind forecast given in km/h to knots?

Divide by 1.852. A 63 km/h wind is 34 knots, which is the gale-force threshold — the round metric number and the round knot number do not coincide, which is why forecasts published in both units look inconsistent.

How many knots are in a kilometer per hour?

One kilometer per hour equals 0.5399568 knots.

How do you convert kilometers per hour to knots?

Multiply the number of kilometers per hour by 0.539956803456 to get knots.

What is 1 knot in kilometers per hour?

One knot equals 1.852 kilometers per hour.

When would I convert kilometers per hour to knots?

This conversion is common when driving, running, cycling, aviation, and weather reports.