Calculator
Splits calculator.
Enter a race distance, finish time, and desired split interval to generate even splits, lap times, and cumulative checkpoints.
Plan your splits
Pace — /km · — /mi
Speed — km/h · — mph
Splits
| # | Checkpoint | Lap | Cumulative |
|---|---|---|---|
| — | — | — | — |
How split times are generated
The splits table is built from the same pace and speed relationships used in the pace calculator, with an additional step to chunk the race into equal intervals.
- Convert distance and interval to kilometres (1 mile = 1.60934 km) so the math works in a single unit system.
- Compute total seconds per kilometre (pace = time ÷ distance) and multiply by the interval size to get each lap time.
- Accumulate lap times to produce the cumulative column and re-convert checkpoints back into the user’s chosen units for display.
Even vs. varied pacing
| Approach | Pluses | Minuses |
|---|---|---|
| Even splits (default) | Simple to memorise, keeps effort steady, aligns with most record attempts. | Doesn’t model terrain or tactical surges; you must adjust manually for hills or turns. |
| Negative split (manually adjust) | Can reflect championship racing strategy and fatigue management. | Requires editing the exported CSV or manually tweaking laps—this tool doesn’t currently automate it. |
Because checkpoints are derived from evenly spaced intervals, rounding is applied only in the final display (to the nearest second). Exported CSV values retain millisecond precision so you can customise them in a spreadsheet if you need bespoke pacing plans.