How it is worked out
Pace is time divided by distance, time is pace times distance, and distance is time divided by pace. A mile is 1.609344 kilometres. Splits assume an even pace; the last one is partial if the distance is not a whole number.
pace = time ÷ distance time = pace × distance distance = time ÷ pace
Times are kept in seconds and rounded to whole seconds only when shown.
Example: pace
10 km in 50:00 = 3,000 seconds ÷ 10 = 5:00 per km, which is 8:03 per mile, 12 km/h.
Example: time
13.1 miles at 9:00 per mile = 13.1 × 540 = 7,074 seconds = 1:57:54.
Example: distance
30 minutes at 8:00 per mile = 1,800 ÷ 480 = 3.75 miles.
Questions
How do I convert pace between miles and kilometres?
A mile is 1.609344 kilometres. Pace per mile is pace per kilometre × 1.609344, and pace per kilometre is pace per mile ÷ 1.609344. The calculator shows both.
Are the splits the pace I will actually run?
No. They assume an even pace the whole way. Real runs have hills, tired legs and fast finishes.
What if my distance is not a whole number?
The last split is partial: its time is the total time. For 5.5 km at 5:00 per km, the sixth split is half a kilometre long.
What does it do with speed?
Speed is 3,600 seconds ÷ pace in seconds. A 5:00 per km pace is 12 km/h. It is shown in km/h and mph.
Is this a training plan?
No. It is arithmetic on the numbers you enter.