Running Split Calculator
Plan your race with target split times and cumulative elapsed times. Choose a distance, enter your goal time, and create an even-paced running schedule.
Plan your race splits
Choose your distance, finishing time, and preferred split interval.
Running Split Results
Your target splits
Times are calculated using a constant average pace.
| Split | Distance | Split time | Elapsed time |
|---|
Split times are rounded to whole seconds. The final elapsed time matches your selected target finish. Your actual race pace may vary.
How do running splits work?
A running split is the time it takes to complete a specific part of a run, such as one kilometre or five kilometres.
Split times help runners track their progress throughout a race and compare their actual pace with a planned target.
How to calculate even running splits
Even pacing means maintaining the same average speed throughout the planned distance. To calculate that pace, divide your target finishing time by the total distance.
Once the target pace is known, multiply it by each interval's distance to calculate its split time.
Example: Running a 5K in 25 minutes
Suppose you want to run five kilometres in 25 minutes.
Dividing 25 minutes by five kilometres gives a target pace of five minutes per kilometre.
Your cumulative times would be 5:00 at 1 km, 10:00 at 2 km, 15:00 at 3 km, 20:00 at 4 km, and 25:00 at the finish.
What is cumulative time?
Cumulative time is the total elapsed time from the start of your run to a particular distance marker.
For example, if your first three one-kilometre splits each take five minutes, your cumulative time at three kilometres is 15 minutes.
What happens with an incomplete final split?
Some races do not divide exactly into whole-kilometre intervals. A half marathon, for example, covers 21.0975 kilometres.
With one-kilometre splits, the last segment is only 0.0975 kilometres. This calculator automatically shortens the final interval to match the actual race distance.
Should every race be run at an even pace?
Even pacing is a useful planning reference, but it is not the only race strategy. Some runners use negative splits, where the second part of a race is faster than the first.
Hills, weather, terrain, fatigue, and race-day conditions can also affect your actual pace.
This tool provides an even-paced reference schedule. It does not predict your performance or require you to maintain an exact pace.
Frequently Asked Questions
What is a good split time for a 5K?
A suitable split depends on your goal finishing time and ability. For example, a 30-minute 5K requires an average pace of 6:00 min/km.
Can I calculate half-marathon splits?
Yes. Select Half Marathon and enter your target time. The calculator accounts for the full distance of 21.0975 kilometres.
What is the difference between split time and cumulative time?
Split time shows how long a particular interval takes. Cumulative time shows the total time elapsed from the beginning of the race.
Why do some split times differ by one second?
The calculator displays whole seconds. Rounding can create small differences between displayed interval times, even when the underlying target pace is constant.