Split Time Calculator
Enter the race distance and your target time. You get the time for each kilometre or mile, a cumulative split list, and the elapsed and remaining time at a checkpoint. Use it to get splits for a 10K at 50 minutes or a half marathon at 1 hour 45.
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Formula
- Time per split:
target time / total distance(both in the split unit) - Split k:
time per split x k - Elapsed at a checkpoint:
time per split x checkpoint distance; remaining istarget time - elapsed - 1 mile = 1.609344 km exactly. This assumes a perfectly even pace.
Worked example
10 km in 50:00 (3,000 s), splitting every km: each km takes 300 s = 5:00, which is 8:03 per mile. At the 4 km checkpoint, elapsed is 4 x 300 = 1,200 s = 20:00 and remaining is 30:00.
For 5 miles in 40:00 split by km: 8.04672 km, 2,400 / 8.04672 = 298 s = 4:58 per km; at 3 km, elapsed 14:55 and remaining 25:05.
When to use it
Use it for any race distance, from a 400 m repeat to an ultra, when you want a list of target times at every km or mile and the elapsed and remaining time at a checkpoint such as the 4 km mark. It assumes an even pace.
Typical split tables
| Race and goal | Pace | Split |
|---|---|---|
| 10 km in 50:00 | 5:00 per km | 5:00 every km |
| Half marathon in 1:45:00 | 4:59 per km | 10 km at 49:46 |
| 5 miles in 40:00 | 8:00 per mile | 8:00 every mile |
Common mistakes
- Choosing the wrong distance unit. The distance unit and the split unit can differ.
- Using the final partial split as a full one. A distance of 21.1 km ends with a 0.1 km split.
- Expecting even splits on hilly courses.
How it differs from nearby tools
The marathon pace calculator is tuned for 42.195 km goals. The negative split calculator plans a faster second half, and the race time predictor calculates a goal time from another race. This page produces splits for any distance.
Frequently asked questions
How do I work out my split times?
Divide the target time by the distance to get the time for one split, then multiply by the split number. 10 km in 50:00 is 3,000 s ÷ 10 = 300 s, so the splits are 5:00, 10:00, 15:00 and so on.
Can I get km splits for a race measured in miles?
Yes. Choose the race distance in miles and split in kilometres. 5 miles is 8.04672 km, so 40:00 gives 2,400 ÷ 8.04672 = 298 s, or 4:58 per km.
How do I check elapsed and remaining time?
Enter the checkpoint distance. At 4 km of a 10 km race in 50:00 the even-pace elapsed time is 20:00 and 30:00 remains.
Why are real splits different from even pace?
Hills, wind, crowds and fatigue change your speed. Even splits are a plan, not a prediction. If the last split is shorter than a full unit it is listed at the finish distance.
What are the splits for a 10K in 50 minutes?
An even 10 km in 50:00 is 3,000 / 10 = 300 seconds per km, or 5:00 per km and 8:03 per mile. You should pass 5 km in 25:00 and the 4 km mark in 20:00.
What are the splits for a half marathon in 1 hour 45 minutes?
A half marathon of 21.1 km in 1:45:00 is about 4:59 per km (8:01 per mile). The 10 km mark is reached at about 49:46 and 20 km at 1:39:32.
What pace per km is 5 miles in 40 minutes?
Five miles is 8.04672 km, so 2,400 s / 8.04672 = 298 s, or 4:58 per km. The same run is 8:00 per mile.