Speed Converter
Convert between meters per second, kilometers per hour, miles per hour and knots instantly — free and private.
Speed limits, running paces and sailing speeds each favor different units, and this converter switches between them without breaking stride. It uses the exact legal definitions of the mile and the nautical mile, so conversions are precise enough for navigation and physics alike. Enter a speed and see the equivalents live.
1 knot = 1 nautical mile per hour = 1.852 km/h.
How to use the Speed Converter
- Type the speed you want to convert in the value box.
- Select the starting unit in the From list and the target unit in the To list.
- The converted speed appears instantly below — adjust any field to recalculate.
Speed Converter — FAQs
How fast is 100 km/h in miles per hour?
100 kilometers per hour equals 62.1371 miles per hour. This tool uses the exact definition of 1 mile as 1,609.344 meters, so road-trip speed limits and car specifications convert precisely. Type any speed and the result updates live in all supported units.
What exactly is a knot?
A knot is one nautical mile per hour, equal to 1.852 kilometers per hour exactly. It is the standard speed unit in aviation and maritime navigation because the nautical mile relates directly to latitude. Sailors, pilots and weather reports all rely on it.
Why do scientists use meters per second?
Meters per second is the SI unit of speed, which makes it the natural choice for physics equations, wind measurements and athletic sprint analysis. Converting a 100-meter sprint time to m/s, for example, gives a clean number that plugs straight into kinetic-energy and momentum formulas.
Is my data uploaded anywhere?
Your data never leaves your device. This converter runs entirely in your browser using JavaScript, so nothing is uploaded, stored, shared or tracked. It works offline too, and you can use it as often as you like with complete confidence.