Calculate pace, time or distance for any run - all in your browser.
Running pace is the key metric for every runner. Enter any two of distance (km), total time (H:MM:SS) or pace (M:SS per km) and this tool instantly computes the missing value using time = distance x pace.
Results are shown in both min/km and min/mi at once, so there is no separate unit conversion to do, and pace is rounded to the nearest second (M:SS) the way race plans are written.
No. All calculations run locally in your browser; nothing is sent to a server and it works fully offline after load.
time (seconds) = distance (km) x pace (seconds per km). Given any two, the tool solves for the third by direct arithmetic.
Inputs use kilometres; the result panel always shows the equivalent pace in min/mi alongside min/km.
Exact to floating-point precision; pace is shown to the nearest second (M:SS) and distance to three decimals.