Speed Converter

Convert between different speed units including metric (meters per second, kilometers per hour), imperial (miles per hour, feet per second), nautical (knots), and other specialized units.

Note: The speed of light in a vacuum is approximately 299,792,458 meters per second (m/s), which is often used as a reference for high-speed conversions in physics.

Conversion Formula:

1 km/h = 0.621371 mph

Common Speed Conversions

1 m/s = 3.6 km/h

1 km/h = 0.621371 mph

1 mph = 1.60934 km/h

1 knot = 1.852 km/h

1 mph = 1.46667 ft/s

1 Mach = 343 m/s (at sea level, 15°C)

Interesting Speed Facts

  • The world's fastest land animal, the cheetah, can reach speeds of up to 113 km/h (70 mph).
  • The peregrine falcon is the fastest bird and animal in the world, reaching speeds of up to 389 km/h (242 mph) during its hunting dive.
  • The average walking speed for humans is about 5 km/h (3.1 mph).
  • The speed of sound varies with temperature and altitude. At sea level and 20°C, it's approximately 343 m/s (1,235 km/h or 767 mph).
  • The Earth rotates at approximately 1,670 km/h (1,037 mph) at the equator.
  • The fastest recorded human running speed is about 44.72 km/h (27.8 mph), achieved by Usain Bolt.