Common Speed Conversions
Speed References
Walking Speed
~5 km/h (3 mph)
City Speed Limit
50 km/h (31 mph)
Highway Speed
120 km/h (75 mph)
Sound Speed
343 m/s (1235 km/h)
About Speed Conversion
Convert between different units of speed and velocity including kilometers per hour (km/h), miles per hour (mph), meters per second (m/s), knots, and feet per second. Essential for automotive, aviation, maritime, and physics applications.
Popular Speed Conversions
- Kilometers per hour to miles per hour (km/h to mph)
- Miles per hour to kilometers per hour (mph to km/h)
- Meters per second to kilometers per hour (m/s to km/h)
- Knots to kilometers per hour and miles per hour
Frequently Asked Questions
How do I convert km/h to mph?
To convert kilometers per hour to miles per hour, multiply by 0.621371. For example, 100 km/h = 62.14 mph. This conversion is essential for international travel and understanding speed limits.
What is the difference between speed and velocity?
Speed is a scalar quantity that measures how fast an object moves, while velocity is a vector quantity that includes both speed and direction. In everyday use, the terms are often used interchangeably.
How do I convert meters per second to km/h?
To convert m/s to km/h, multiply by 3.6. For example, 10 m/s = 36 km/h. This conversion is useful in physics calculations and scientific measurements.
What are knots and how do they relate to other speed units?
A knot is a unit of speed equal to one nautical mile per hour, approximately 1.852 km/h or 1.151 mph. Knots are primarily used in maritime and aviation contexts.
What is the speed of sound in different units?
The speed of sound at sea level is approximately 343 m/s, 1,235 km/h, or 767 mph. This speed varies with temperature, humidity, and altitude.
How fast is the speed of light?
The speed of light in a vacuum is approximately 299,792,458 m/s or about 1.08 billion km/h. This is the ultimate speed limit in the universe according to Einstein's theory of relativity.