Negative Split Planner
Plan equal-distance running splits with a slower first half and faster second half, keeping your target total time.
Enter your distance, target time, split count and percentage.
| Split | Distance to here (km) | Pace (min:sec/km) | Split time | Elapsed time |
|---|
A negative split is a strategy, not a guarantee. Terrain, fatigue and crowds matter. The same percentage does not transfer equally across distances. This is not a medical or coaching prediction.
A QUICK WALKTHROUGH
How to use this tool
- Enter your distance, target time, split count and percentage.
- 52.5 minutes means 52 minutes 30 seconds.
- For an odd split count, the middle split covers half its distance at each pace.
Average pace
D: distance in km; T: target minutes; P: percentage. A = 60T / D; S = AP / 100; first-half pace = A + S / 2; second-half pace = A − S / 2.
Local calculation
A negative split is a strategy, not a guarantee. Terrain, fatigue and crowds matter. The same percentage does not transfer equally across distances. This is not a medical or coaching prediction.
GOOD TO KNOW
Common questions
Are values uploaded?
No. Calculation, table copying and CSV generation happen in your browser.