Speed Converter

Convert between km/h, mph, m/s, knots, and more speed units

Speed Converter
Use the fields below to calculate results or convert units for this tool.

Common Speed Conversions

100 km/h = 62 mph
60 mph = 97 km/h
10 m/s = 36 km/h
100 knots = 185 km/h

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.