Negative Split Calculator
First-half and second-half target paces
AI logs your meals from a photo. Diet & workouts in one app.Get the free apprace distance, e.g. 42.195 for a marathon
Target finish time
how much faster the 2nd half is, e.g. 2
Negative Split Calculator
The fastest way to run a distance is rarely an even pace — it is a slight negative split, holding back early and finishing strong. Enter the distance, your goal finish time and the negative split percentage you want, and this calculator returns your first-half and second-half pace per kilometre plus the exact time to pass halfway. Use it to plan a smart race and resist the urge to go out too hard.
A negative split means running the second half of a race faster than the first — the pacing strategy behind most distance running personal bests and world records. Enter your distance, goal time and how much faster you want the second half to be, and this gives the pace for each half and the time you should hit at halfway. A 1–3% negative split is realistic for most runners; start too fast and you fade instead.
Frequently Asked Questions
- What is a negative split?
- A negative split means running the second half of a race faster than the first half. This calculator takes your race distance, goal time, and chosen split percentage to produce target paces for each half of the run.
- How do I use the negative split calculator?
- Enter your race distance and goal finish time, then set how much faster you want the second half to be. The calculator returns a slightly slower first-half pace and a faster second-half pace that together hit your goal time.
- Why race with a negative split?
- Starting conservatively conserves glycogen and limits early fatigue, so you can finish strong and often run a faster overall time. Many distance records and personal bests are set with a negative split rather than fading in the final miles.