Speed Converter

Use this tool to convert between different units of speed, such as meters per second, kilometers per hour, miles per hour, and more.

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Common Speed Conversions

mph to km/h mph → km/h
km/h to mph km/h → mph
m/s to km/h m/s → km/h
knots to mph knots → mph

What is Speed Conversion?

Speed conversion is process of converting velocity measurements from one unit to another. Our speed converter tool supports multiple speed units including kilometers per hour, miles per hour, meters per second, knots, and more, making it easy to switch between metric and imperial systems for transportation, sports, aviation, and maritime applications.

The metric system uses kilometers per hour (km/h) and meters per second (m/s), while the imperial system primarily used in the United States uses miles per hour (mph). Knots are specifically used in aviation and maritime contexts. Quick conversion between these units is essential for international travel, shipping navigation, sports timing, vehicle speed limits, and scientific measurements.

Simply enter your value in the "From" field, select the original speed unit, choose your target unit in the "To" field, and the converter will instantly display the converted result along with the conversion formula.

Speed Conversion Examples

Driving Example

Converting speed limits for international driving:

  • 100 km/h = 62.14 mph
  • 60 mph = 96.56 km/h
  • 120 km/h = 74.56 mph

Running Example

Converting running pace to speed:

  • 10 km/h = 2.78 m/s
  • 5 m/s = 18 km/h
  • 15 mph = 24.14 km/h

Maritime Example

Converting ship speeds from knots:

  • 20 knots = 23.02 mph
  • 30 knots = 34.52 mph
  • 50 knots = 57.54 km/h

Frequently Asked Questions

How do I convert km/h to mph?

To convert kilometers per hour to miles per hour, multiply the value by 0.621371. For example, 100 km/h × 0.621371 = 62.14 mph.

What is a knot in speed?

One knot equals one nautical mile per hour, which is approximately 1.15 mph or 1.85 km/h. It is primarily used in maritime and aviation contexts.

How do I convert mph to km/h?

To convert miles per hour to kilometers per hour, multiply the value by 1.60934. For example, 60 mph × 1.60934 = 96.56 km/h.

How many meters per second is 100 km/h?

100 km/h equals approximately 27.78 meters per second. To convert km/h to m/s, divide by 3.6.

What is the speed of sound in mph?

The speed of sound at sea level and 20°C is approximately 767 mph (1,235 km/h or 343 m/s). This varies with temperature and altitude.