Kilometers per Hour Converter

Convert kilometers per hour (km/h) to m/s, mph, knots, and Mach.

Calculator

decimal places

The kilometer per hour (km/h) is a non-SI unit of speed and the most common unit for road traffic. Most countries use km/h on road signs and car speedometers.

Common km/h Conversions

  • 1 km/h ≈ 0.278 m/s — divide by 3.6 to convert to meters per second.
  • 1 km/h ≈ 0.621 mph — multiply by 0.621 to convert to miles per hour.
  • 1 km/h ≈ 0.540 knots — multiply by 0.540 to convert to nautical miles per hour.
  • 1 km/h ≈ 0.000816 Mach — at sea level and 20 °C.

Kilometers per hour are used in most countries across Europe, Asia, and Africa. The US, the UK, and a few other countries use miles per hour instead.