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Speed Converter

Convert between meters per second, kilometers per hour, miles per hour, knots, feet per second, and Mach

About the Speed Converter

The Speed Converter handles conversions between six common speed units: meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), knots (kn), feet per second (ft/s), and Mach number. It uses meters per second as the base unit with standard conversion factors. The Mach approximation is calculated using the speed of sound at sea level (340.3 m/s under standard atmospheric conditions).

Speed conversion is important in transportation, aviation, meteorology, and physics. Whether comparing vehicle speeds across different unit systems or interpreting wind speeds in weather reports, this tool delivers fast and reliable results.

How to Use This Calculator

  1. Enter the speed value in the "From" input field.
  2. Select the unit of your input from the "From Unit" dropdown.
  3. Select the target unit from the "To Unit" dropdown.
  4. Click "Convert" to see the result instantly.

FAQs

What is the difference between a knot and a mile per hour?

A knot is a unit of speed equal to one nautical mile per hour, approximately 1.15078 mph. Knots are used in aviation and maritime contexts because they relate directly to latitude and longitude coordinates. One knot equals 0.514444 m/s, while one mph equals 0.44704 m/s.

How is Mach number calculated?

Mach number is the ratio of an object's speed to the speed of sound in the surrounding medium. At sea level and 15°C, the speed of sound is approximately 340.3 m/s (1,225 km/h or 761 mph). This converter uses the sea-level value for approximation. Actual Mach number varies with altitude and temperature.