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Pace per Kilometer Calculator

Get your pace per kilometer and speed instantly.

How it is calculated

The pace is pace = time ÷ distance, with time in decimal minutes and distance in kilometres. The decimal part is converted to seconds (0.25 min = 15 s) and shown as min:sec per km, with seconds rounded to the nearest whole second. Speed is speed = distance ÷ (time ÷ 60) in km/h, with two decimals. The time field is not hours:minutes:seconds: a 52 minute 30 second run must be typed as 52.5. The tool needs time and distance both above zero, otherwise it returns nothing. It does not check that the pair is physically possible, so a 1 minute run over 1,000 km still produces a pace of 0:00 /km.

Worked example

You ran 10 km in 52 minutes and 30 seconds. Convert the time to decimal minutes: 30 s ÷ 60 = 0.5, so the time is 52.5 min. Pace = 52.5 ÷ 10 = 5.25 min per km, and 0.25 min is 15 seconds, so the pace is 5:15 /km. Speed = 10 ÷ (52.5 ÷ 60) = 10 ÷ 0.875 = 11.43 km/h. To hold the same pace over a half marathon (21.0975 km) you would need about 110 min 46 s.

Try this example →

Common mistakes

  • Typing 52.30 for 52 minutes 30 seconds. The tool reads that as 52.3 minutes, which is 52 min 18 s, and returns 5:14 /km instead of 5:15.
  • Entering the time in hours and minutes together (such as 1.15 for 1 h 15 min). The field takes minutes only, so 75 is the correct entry.
  • Entering miles in the distance field. The pace comes out per kilometre, so a 6.2-mile run must be converted to about 10 km first.
  • Mixing up pace and speed. A lower pace figure is faster, while a higher km/h is faster.

About this calculator

Running pace per kilometer expresses how long it takes to cover one kilometer, given as minutes and seconds (min:sec/km), and is calculated simply as total time divided by total distance in kilometers. It is the direct inverse of speed: dividing distance by time gives km/h, while dividing time by distance gives pace, and the two are just different ways of describing the same effort.

Runners and coaches use pace almost universally for training and racing because it is easier to reason about mid-run than raw speed — a target of '5:00/km' for a tempo run is more intuitive to hold than '12 km/h'. Pace per kilometer also underlies race-time predictions, splits pacing strategy for marathons and half-marathons, and GPS watch training zones, where zones are often defined in pace bands rather than speed.

This calculator converts a run time and distance into both pace per kilometer and speed in km/h, so you can plan splits or compare effort across runs of different distances.

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