Speed Converter

Convert a speed between metres per second, kilometres per hour, miles per hour and knots.

Worked example

100 km/h is approximately 62.1371 mph.

How it works

Xiliro converts between common speed units (metres per second, kilometres per hour, miles per hour and knots), using exact constants derived from the same length units used elsewhere on the site. This tool converts a plain speed magnitude only; it does not calculate pace, travel time, or acceleration. Enter zero or a positive value; the displayed result may be rounded for readability, but the underlying calculation always uses the full, unrounded value.

What this result means

The converted value uses exact, defined conversion factors between the two units you chose.

Assumptions and limitations

No feet-per-second, Mach, or pace/travel-time calculation — this converts a speed magnitude only.