Split calculator: even and negative splits
Turn a goal time into checkpoint splits for every kilometre or mile. Choose even pacing, or a gentle negative split where you start slightly slower and finish faster.
How the splits are calculated
Even splits divide your goal time evenly across the distance. Negative splits change pace gradually: the "spread" is the difference between your first and last split as a percentage of average pace. With a 3% spread, the first km is about 1.5% slower than average and the last about 1.5% faster. Pace changes in a straight line from start to finish, so the splits always add up exactly to your goal time. Partial last segments (like the final 0.11 mile of a 5K) are shown separately.
Example: 25:00 5K
| Km | Even split | Even elapsed | 3% negative split | Negative elapsed |
|---|---|---|---|---|
| 1 | 5:00 | 5:00 | 5:04 | 5:04 |
| 2 | 5:00 | 10:00 | 5:02 | 10:05 |
| 3 | 5:00 | 15:00 | 5:00 | 15:05 |
| 4 | 5:00 | 20:00 | 4:58 | 20:04 |
| 5 | 5:00 | 25:00 | 4:56 | 25:00 |
For most 5K runners, even pacing or a small negative split works best. Going out too fast is the classic mistake; see how to pace a 5K.
FAQ
Should I run even or negative splits in a 5K?
Even or slightly negative splits are usually fastest. Starting 10–15 seconds per km too fast often costs more time later than it saves.
What does a 3% spread mean in seconds?
At 5:00/km average, 3% is 9 seconds: roughly 5:04–5:05 for the first km down to about 4:55 for the last.
Why is the last mile split shorter?
A 5K is 3.107 miles, so after three full miles there is a final 0.107-mile (about 172 m) segment.
Related
- Running pace calculator – pace from time, or time from pace
- Race time predictor – mile to marathon, Riegel formula
- Training pace calculator – easy, tempo, interval and repetition paces from your 5K
- Treadmill pace converter – mph or km/h to min/mile and min/km
- Km to mile pace converter – min/km ↔ min/mile
- All pace charts – printable tables