The number most of the world trains by
In Australia, the UK and most of Europe, pace is written in minutes per kilometre. A 50-minute 10K is 5:00 per kilometre, and that single number is enough to set training zones, estimate a half marathon and describe a run to another runner.
Splits and projections
The kilometre splits assume even pacing, and the projections extend the same pace to 10K and the marathon. Those projections are arithmetic, not physiology: holding 5:00 per kilometre for 42.195 km is a very different task from holding it for 10 km, which is why the race predictor uses a fatigue exponent instead.
Where the pace comes from
A GPS watch reports instant pace, which jumps around; average pace over a kilometre is much steadier. If you are using a treadmill, the belt speed is exact — 12 km/h is 5:00 per kilometre with no smoothing at all.
Frequently Asked Questions
Is 5:00 per km a good pace?
It is a solid club-runner pace — roughly a 50-minute 10K and a 1:45 half marathon. Whether it is right for you depends on your recent race times.
How do I convert to minutes per mile?
Multiply the per-kilometre pace by 1.609344. Five minutes per kilometre is 8:03 per mile.
Why do the splits stop at the finish?
If the distance is not a whole number of kilometres, the last row shows the remaining partial kilometre so the total matches your time.
Related tools
Privacy & your data
SwimRunPace calculates everything in your browser. Distances, times and body weights are never uploaded — there is no account, no server-side record and no training history stored between visits.