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You race on pace, not on finish time
A goal is set as a time — "10K in 55 minutes" — but the number on your watch while you run is pace. Dividing 55 by 10 gives 5:30 per kilometre, and that is what tells you whether the first kilometre went out too fast. This calculator does that conversion and lays out the splits alongside it.
Splits are more useful mid-race than pace
Pace jumps around with hills, crossings and crowds, so the instantaneous number is noisy. Experienced runners memorise the clock time they should see at 5 km instead. One number, checked once, tells you whether you are ahead or behind.
Holding a pace gets harder as the distance grows
The equivalent-times table below simply extends your pace to other distances. In practice, doubling the distance costs roughly 15 to 20 seconds per kilometre, so converting a 10K time straight into a marathon target produces something optimistic. Use it to set training paces, not race goals.
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Frequently asked questions
QHow do I convert a finish time into a pace?
Divide the total time by the distance. A 55-minute 10K is 5 minutes 30 seconds per kilometre. Memorising the pace rather than the finish time is what lets you correct yourself in the first kilometre instead of the last.
QWhy show split times as well?
Pace readings swing with terrain and traffic. A split — the clock time you should see at 5 km, 10 km and so on — is a single stable check. If the clock reads less than the target, you are ahead.
QCan I predict a marathon time from a 10K?
Not by extending the pace, which is what the table does. Real fade over distance costs about 15 to 20 seconds per kilometre each time the distance doubles, so a straight extension is too optimistic. Coaches use fade factors and long-run data instead.
QWhy is mile pace shown too?
Races in the US, UK and Ireland are often marked in miles, and many watches ship set to miles. One mile is 1.609344 km, so a 5:00/km pace is 8:03 per mile.