What is the difference between split and cumulative time?

The split is the time for that one segment (for example kilometer 7). The cumulative time is your total clock time up to that point — that is what shows on the race clock.

What are negative splits?

Negative splits mean running the second half faster than the first. It is a proven strategy for PRs because you start fresh and finish strong rather than fading.

Can I calculate per mile?

Yes. Choose miles in the menu or footer. The distance input and split table follow that setting, so you see splits per mile instead of per kilometer.

Does the table account for the course?

No, the splits assume a flat, even effort. On a hilly course you will run uphill slower and downhill faster; use the table as an average guide in that case.

Running Split Calculator: Even and Negative Splits per Mile or Km

Distance

Pick your distance

Enter your time or pace

Goal time

Pacemin / km

Enter your details to see the result.

Next step

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How it works

How does the split calculator work?

The calculator spreads your goal time across the distance. With an even strategy every split is the same speed; with negative splits you gradually speed up, with positive splits you slow down. The table shows both the individual split and the cumulative clock at each point.

Good to know

Which strategy should you pick?

Running even is the most efficient and easiest to sustain for most runners. A slight negative split (1-3% faster in the second half) often delivers the best result. Positive splits usually happen by accident from starting too fast — rarely a deliberate choice.

Tips

Using splits during your race

Write your key splits on a wristband or program them into your watch. Check your splits at each marker, but be careful not to overcorrect: small deviations are normal due to bends, hills, and congestion at the start.

FAQ