Race Split Calculator

The race distance this calculation is based on. Pick a standard event, or choose Custom distance to enter any length in kilometers.

Race length in kilometers when Custom distance is selected, e.g. 12 for a 12 km trail race.

The total time you want to finish in, as h:mm:ss or m:ss. Every split in the table adds up exactly to this time.

Whether the table lists one split per kilometer or per mile. Pick the unit your race marks its course in.

How your pace is spread over the race:

• Even splits: the same pace from start to finish.
• Negative split: start slower than average and speed up, finishing fastest.
• Positive split: start faster and gradually slow down.

How far from average pace the race starts when using a negative or positive split. The pace then ramps linearly so the splits still sum to your goal time.

Example: 3% on a negative split starts 3% slower than average and finishes about 3% faster.