Convert Kilometers Per Hour (km/h) to Knots (kn)
1 kilometer per hour equals 0.539957 knots.
Kilometer Per Hour to Knot Converter
How to Convert Kilometer Per Hour to Knot
1 kilometer per hour = 0.539957 knots exact
Knot = Kilometer Per Hour × 0.539957
Example: 1 km/h × 0.539957 = 0.539957 kn
Reverse Conversion
To convert knots back to kilometers per hour:
- Remember, 1 knot equals 1.852 kilometers per hour.
- To convert 0.539957 kn to km/h, multiply
0.539957 x 1.852, resulting in1 km/h.
exact This conversion factor is exact by international definition.
Common Kilometer Per Hour to Knot Conversions
| Kilometer Per Hour | Knot | Actions |
|---|---|---|
| 1 kilometer per hour | 0.539957 knots | |
| 10 kilometers per hour | 5.39957 knots | |
| 50 kilometers per hour | 26.9978 knots |
| Kilometer Per Hour | Knot | Actions |
|---|---|---|
| 100 kilometers per hour | 53.9957 knots | |
| 200 kilometers per hour | 107.991 knots | |
| 500 kilometers per hour | 269.978 knots |
Kilometers per hour to knots Conversion Table
Reference table with common kilometers per hour to knots conversions. All values calculated with high precision.
Kilometers Per Hour to Knots Table
0.001 to 5
Kilometers Per Hour to Knots Table
10 to 1000000
Knots to Kilometers Per Hour Table
0.0001 to 12
Knots to Kilometers Per Hour Table
1 to 100000
Definition of Knot
Knots: A Unit of Measurement for Speed
A knot (symbol: kn or kt) is a unit of speed equal to one nautical mile per hour (approximately 1.852 kilometers per hour or 1.15078 miles per hour). Knots are the standard unit of speed in aviation and maritime navigation worldwide.
The formal definition of a knot is the speed at which one nautical mile is traveled in one hour. The abbreviation "kts" (knots) is commonly used in aviation, particularly for airspeed indicators and flight plans.
Why Do Pilots and Sailors Use Knots?
Knots are preferred in aviation and maritime contexts because they are directly tied to the nautical mile, which corresponds to one minute of arc of latitude on the Earth's surface. This makes navigation calculations simpler when working with charts and coordinates. All international aviation and maritime communications use knots as the standard speed unit.
Common Aircraft Speeds in Knots
- Light aircraft cruise speed: 100-150 kts
- Turboprop aircraft cruise: 250-350 kts
- Commercial jet cruise (typical): 400-500 kts
- Boeing 737 cruise: ~450 kts (Mach 0.78)
- Boeing 777 cruise: ~490 kts (Mach 0.84)
- Airbus A320 cruise: ~447 kts (Mach 0.78)
Aviation Speed Terminology
- IAS (Indicated Airspeed): The speed shown on the aircraft's airspeed indicator, measured in knots.
- TAS (True Airspeed): The actual speed of the aircraft relative to the air mass, corrected for altitude and temperature.
- GS (Ground Speed): The speed of the aircraft relative to the ground, affected by wind.
- Mach Number: Speed relative to the speed of sound, commonly used at high altitudes.
Conversions to Other Units of Measurement:
- Kilometers per Hour (km/h): To convert knots to kilometers per hour, multiply the speed in knots by approximately 1.852. For example, 1 knot is equal to approximately 1.852 kilometers per hour.
- Miles per Hour (mph): To convert knots to miles per hour, multiply the speed in knots by approximately 1.15078. For example, 1 knot is equal to approximately 1.15078 miles per hour.
- Meters per Second (m/s): To convert knots to meters per second, multiply the speed in knots by approximately 0.514444. For example, 1 knot is equal to approximately 0.514444 meters per second.
- Feet per Second (ft/s): To convert knots to feet per second, multiply the speed in knots by approximately 1.68781. For example, 1 knot is equal to approximately 1.68781 feet per second.
- Beaufort Scale: The Beaufort scale is a measure of wind force based on observed sea conditions. It ranges from 0 (calm) to 12 (hurricane force). Knots are often used in conjunction with the Beaufort scale to estimate wind speeds.
About the Kilometer Per Hour
Facts & Uses
- 1 km/h = 1000 m / 3600 s = 5/18 m/s exactly. The dominant speed unit for road vehicles in metric countries (everywhere except the US, UK, and a few others).
- Standard for speed limits worldwide: typical urban 50 km/h, rural 80-90 km/h, highway 100-130 km/h.
- Used in weather forecasts (wind speed in km/h), cycling (speedometers), and international aviation ground speed reporting in some contexts.
- Reference: walking ≈ 5 km/h, cycling 15-25 km/h, marathon pace ≈ 12-20 km/h, highway speeds 100-130 km/h.
Curiosities
- The UK uses mph for road signs despite being metric for almost everything else — one of the very few exceptions in modern UK metrication.
- Highest road speed limits: Germany Autobahn (no general limit), Poland 140 km/h, several Gulf states 140-160 km/h. Most of Europe caps at 130 km/h.
- The fastest production car (Bugatti Chiron Super Sport) tops out at about 490 km/h; the land speed record (ThrustSSC, 1997) exceeds 1227 km/h — supersonic.
- Approximate equivalents: 100 km/h ≈ 62.137 mph ≈ 27.78 m/s ≈ 53.996 knots.
Sources
About the Knot
Facts & Uses
- 1 knot = 1 nautical mile per hour = 1.852 km/h exactly (international definition since 1929 ITHC, ratified by ISO/BIPM).
- Standard speed unit for maritime navigation (ships, boats), aviation (airspeed and ground speed), and meteorology (wind speed reports).
- Used in weather forecasts (winds aloft, hurricane intensity), oceanography (currents), and military/defense contexts globally.
- Reference: a typical sailboat 4-8 knots, a cargo ship 15-25 knots, aircraft carrier 30+ knots, commercial jet cruise 450-500 knots ground speed.
Curiosities
- The name "knot" comes from the old chip log — a knotted rope thrown overboard to measure ship speed by counting how many knots passed in 28 seconds.
- The nautical mile is exactly 1852 meters, originally defined as 1 minute of arc along a meridian — making global navigation calculations very clean (1° latitude = 60 NM).
- The Beaufort wind scale uses knots for force descriptions: 0 calm (<1 kn), 6 strong breeze (22-27 kn), 12 hurricane (≥64 kn).
- Approximate equivalents: 10 knots ≈ 18.52 km/h ≈ 11.51 mph ≈ 5.144 m/s.
Sources
Frequently Asked Questions
How many knots are in one kilometer per hour?
One kilometer per hour equals 0.539957 knots. To convert, multiply the kilometer per hour value by 0.539957. For the reverse, divide the knot value by 0.539957 (or multiply by 1.852).
What is 22 kilometers per hour in knots?
22 kilometers per hour = 11.879 knots. This is one of the most commonly searched conversions for this pair.
How precise is the kilometer per hour-to-knot conversion?
The factor 0.539957 is accurate to 6 significant figures, derived from international measurement standards. Our calculator uses full precision internally.
Looking for the reverse? Convert Knot to Kilometer Per Hour
Related Speed & Velocity Converters
Explore other speed & velocity conversion tools:
- Mach to Kilometers Per Hour
- Miles Per Hour to Kilometers Per Hour
- Kilometers Per Second to Kilometers Per Hour
- Kilometers Per Hour to Miles Per Hour
- Knots to Miles Per Hour
- Meters Per Second to Kilometers Per Hour
- Kilometers Per Hour to Meters Per Second
- Feet Per Second to Kilometers Per Hour
- Knots to Meters Per Second
- Kilometers Per Hour to Feet Per Second
Related in other categories:
- G-force to m/s² — Acceleration = change in speed ÷ time
- Hours to Days — Knots = nautical miles per hour (speed × time)
