Something wrong with this tool?
About Speed Converter Online
This tool converts between speed units: meters per second, kilometers per hour, miles per hour, knots, feet per second, and Mach number at sea level.
Speed conversions arise when comparing vehicle performance across markets (km/h vs mph), aviation and maritime navigation (knots), physics problems (m/s), and casual comparisons of wind, running, or driving speed.
The Mach number is calculated at standard sea-level conditions (temperature 15°C). Actual Mach speed varies with altitude and temperature.
How to use this tool
How to convert speeds
Enter the speed
Put the numeric speed in the Value field. Negative speeds are allowed but most use cases stay positive.
Pick the source unit
From offers mps (metres per second), kph (km/h), and mph (miles per hour). Pick the unit your number is in.
Pick the target unit
To lists the same three units. Quick check: 100 kph ≈ 62.14 mph ≈ 27.78 mps.
Press Run and copy
Result is computed via mps as the bridge with 12 significant digits. Round to the precision your speed limit or spec uses.