keisoku

Running Time Calculator

Just enter your distance and pace (min:sec/km) or speed (km/h) to automatically calculate your running time. Predicted times for 5 km, 10 km, half and full marathon are listed too.

Input

Enter your distance and either a pace (min:sec/km) or a speed (km/h) to calculate your finishing time.

km

How to enter your speed

min
sec

/km

Result

Finishing time (10.0 km)

1:00:00

(h:mm:ss)

Distance

10.0 km

Pace

6'00"/km

Speed

10.0 km/h

Predicted times for standard distances at the same pace

DistancePredicted time
5 km(5.0 km)30:00
10 km(10.0 km)1:00:00
Half(21.1 km)2:06:35
Full(42.2 km)4:13:10

How it works

  • Finishing time in seconds is calculated as distance (km) x pace (sec/km). When you enter a pace, the minutes and seconds are first converted to seconds before applying this formula.
  • When you enter a speed (km/h), the pace (sec/km) is first found as 3600 / speed (km/h), then the same formula gives the finishing time.
  • Pace and speed are converted to each other and both are shown. Speed to pace uses 3600 / speed (km/h); pace to speed uses 3600 / pace (sec/km).
  • Predicted times for the standard distances (5 km, 10 km, half marathon 21.0975 km, full marathon 42.195 km) assume a constant pace and are calculated as distance (km) x pace (sec/km).
  • Results are theoretical values that assume you hold a steady pace. Your actual time will vary with course elevation, temperature, condition and other factors.