Speed, Distance and Time Calculator

Speed equals distance divided by time (s = d / t). Rearranged, distance = speed x time and time = distance / speed. The 'Solve for' menu applies whichever version you need.

Yes. Each value has its own unit selector and every input is converted through SI (metres, seconds, metres per second) before solving, so a distance in miles paired with a speed in km/h is no problem.

Divide by 3.6, so 36 km/h is 10 m/s. In the tool, choose Speed as the result and set the speed unit to m/s to see the converted value directly.

It gives average speed over the whole trip: total distance divided by total time. It cannot capture acceleration, stops or changes in pace along the way.

Solving for speed divides by time, and solving for time divides by speed. A zero divisor is undefined, so the tool rejects zero or negative time and zero or negative speed in those cases.

Speed defaults to km/h, distance to km and time to hours, matching the everyday km/h driving case. You can change any of them independently before or after entering values.

Results are rounded to nine decimal places, so clean inputs give clean answers while awkward conversions stay accurate. The math runs in standard double precision.

Not directly. This tool works in speed rather than pace, so it returns values like mph or m/s. For minutes per mile or per kilometre you would want a dedicated pace converter instead.

No. Every calculation runs locally in your browser, so the numbers you type are never uploaded to a server.