Unit conversion
Speed Converter
Convert speeds between kilometers per hour, miles per hour, meters per second, feet per second, and knots.
Convert a value
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Speed is distance divided by time
A knot is one nautical mile per hour, not one ordinary mile per hour. Use knots for nautical or aviation measurements and mph or km/h for road speeds.
This converts speed units only. It does not calculate travel time, pace, or Mach number, which requires a speed of sound for the surrounding conditions.
Example
60 mph = 96.56064 km/h.
Precision and input limits
Results use browser floating-point arithmetic and are rounded to your selected number of significant digits, not decimal places. Small or large results may use scientific notation. This is not an arbitrary-precision calculator.
Enter zero or a number with magnitude from 1e-100 to 1e100. Signed values are supported for mathematical conversions. Swap units exchanges the unit choices without changing your input. Editing an input clears the previous result.