Calculator
Splits calculator
Enter your goal time and distance, and we will show your splits, the halfway time and a pacing strategy — even or negative split.
Goal
h : m : s
Average pace
/km
1st half
/km
2nd half
/km
Splits
| Distance | Elapsed | Segment pace |
|---|---|---|
What is a split plan and a negative split?
A split shows when you should pass each distance marker to hold your goal time. Knowing your splits in advance means you do not have to do mental maths during the race — you just watch the clock and stick to the plan.
A negative split means running the second half of the distance faster than the first. For most runners this is the most effective and most comfortable strategy: starting too fast burns your reserves, while a slightly held-back first half leaves fresh legs for the finish. Even a 1–2% negative split makes a noticeable difference at the line.
Frequently asked questions
What is the difference between even and negative split?
With an even split the pace is constant throughout. With a negative split the second half is faster — many runners find this kinder and faster, because they arrive at the finish fresher.
What split breakdown do I get?
For the marathon and half marathon we break the splits into 5 km segments, for shorter distances per kilometre, plus the finish for the full distance.
Is my goal time realistic?
You can check with the VO2max calculator: from a recent race result it estimates the times you are capable of at other distances. If your goal is far from the estimate, consider adjusting it.
How much negative split should I aim for?
For beginners and over long distances, a 1–2% negative split is a good target. The key is to run the first half with discipline, slightly held back, and save the rest for the end.
The splits assume an even segment pace; in reality the course (hills, turns, wind) and aid stations change the actual times. Treat the plan as a flexible guide.