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km/h
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What is a kilometer per hour?

The global road-speed unit used in 195 countries

Definition

Kilometres per hour (km/h) is the standard speed unit in most of the world. European motorways typically allow 120–130 km/h; urban limits are 50 km/h. Car speedometers in metric countries are marked in km/h, often with smaller mph numbers for US and UK travel.

Common uses

  • European and global road speed limits
  • Car and motorcycle speedometers
  • Weather wind speed reporting (in some regions)

🌍 Real-world scale

German Autobahn typical speed: 130 km/h (recommended) to 180+ (no limit sections). French limit: 130 km/h. Urban: 50 km/h.

Convert from kilometers per hour

9 conversions
Kilometer per Hour to Meter per Second1 km/h = 0.2778 m/sKilometer per Hour to Mile per Hour1 km/h = 0.6214 mphKilometer per Hour to Knot1 km/h = 0.54 knKilometer per Hour to Mach1 km/h = 0.0008163 MaKilometer per Hour to Foot per Second1 km/h = 0.9113 ft/sKilometer per Hour to Centimeter per Second1 km/h = 27.7778 cm/sKilometer per Hour to Yard per Minute1 km/h = 18.2269 yd/minKilometer per Hour to Inch per Minute1 km/h = 656.685 in/minKilometer per Hour to Beaufort Scale1 km/h = 0.2778 Bft

Convert to kilometers per hour

9 conversions
Meter per Second to Kilometer per Hour1 m/s = 3.6 km/hMile per Hour to Kilometer per Hour1 mph = 1.60934 km/hKnot to Kilometer per Hour1 kn = 1.852 km/hMach to Kilometer per Hour1 Ma = 1,225.04 km/hFoot per Second to Kilometer per Hour1 ft/s = 1.09728 km/hCentimeter per Second to Kilometer per Hour1 cm/s = 0.036 km/hYard per Minute to Kilometer per Hour1 yd/min = 0.05486 km/hInch per Minute to Kilometer per Hour1 in/min = 0.001523 km/hBeaufort Scale to Kilometer per Hour1 Bft = 3.6 km/h

Tips

  • 1 km/h = 0.2778 m/s. Divide by 3.6 for m/s.
  • 1 km/h = 0.621 mph. Multiply by 0.62 for a quick mph estimate.
  • Speed limits: 30 km/h urban, 50 km/h town, 80–100 km/h rural, 110–130 km/h motorway in most of EU.

Common mistakes

  • Using mph values on a km/h speedometer — may misread actual speed.
  • Converting km/h to m/s by dividing by 3 — correct is 3.6.
  • Ignoring "E" for exit or other signs while focused on speed limits.

FAQ about the kilometer per hour

What is a kilometer per hour?
Kilometres per hour (km/h) is the standard speed unit in most of the world. European motorways typically allow 120–130 km/h; urban limits are 50 km/h. Car speedometers in metric countries are marked in km/h, often with smaller mph numbers for US and UK travel.
Where is the kilometer per hour used?
The kilometer per hour is commonly used for: European and global road speed limits; Car and motorcycle speedometers; Weather wind speed reporting (in some regions).
What is an example of a kilometer per hour in real life?
German Autobahn typical speed: 130 km/h (recommended) to 180+ (no limit sections). French limit: 130 km/h. Urban: 50 km/h.
What category does the kilometer per hour belong to?
The kilometer per hour is a unit of speed, part of the 10-unit speed category on UnitConv.
How accurate are kilometer per hour conversions?
All conversion factors follow NIST and BIPM international standards to 8 significant figures — the highest practical accuracy.
Explore all 10 speed units and their conversions.🚀 Speed hub →