Speed Converter
Convert between different speed and velocity units instantly
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Common Speed References
| Description | Speed |
|---|---|
| Average walking speed | 3-4 mph (4.8-6.4 km/h) |
| Average running speed | 8-12 mph (13-19 km/h) |
| Highway driving speed | 55-75 mph (89-121 km/h) |
| Speed of sound in air | 767 mph (1,235 km/h or 343 m/s) |
| Speed of light in vacuum | 670,616,629 mph (1,079,252,848 km/h or 299,792,458 m/s) |
About Speed Units
Speed is the rate of change in position of an object, regardless of its direction. Common units include:
- Meters per second (m/s): The SI unit of speed
- Kilometers per hour (km/h): Common for road speed limits in most countries
- Miles per hour (mph): Used in the USA, UK, and some other countries
- Knots (kn): Used in maritime navigation and aviation (1 knot = 1 nautical mile per hour)
- Mach: Ratio of speed to the speed of sound in a given medium