Swim Split Calculator
Turn a goal distance and finish time into a printable split card. Pick even splits or a mild negative split — the total time always matches your goal.
Split card — 1500 m in 25:00 (even splits)
| # | Distance | Split | Cumulative | Lengths (25m) |
|---|---|---|---|---|
| 1 | 100 m | 1:40 | 1:40 | 4.0 |
| 2 | 100 m | 1:40 | 3:20 | 8.0 |
| 3 | 100 m | 1:40 | 5:00 | 12.0 |
| 4 | 100 m | 1:40 | 6:40 | 16.0 |
| 5 | 100 m | 1:40 | 8:20 | 20.0 |
| 6 | 100 m | 1:40 | 10:00 | 24.0 |
| 7 | 100 m | 1:40 | 11:40 | 28.0 |
| 8 | 100 m | 1:40 | 13:20 | 32.0 |
| 9 | 100 m | 1:40 | 15:00 | 36.0 |
| 10 | 100 m | 1:40 | 16:40 | 40.0 |
| 11 | 100 m | 1:40 | 18:20 | 44.0 |
| 12 | 100 m | 1:40 | 20:00 | 48.0 |
| 13 | 100 m | 1:40 | 21:40 | 52.0 |
| 14 | 100 m | 1:40 | 23:20 | 56.0 |
| 15 | 100 m | 1:40 | 25:00 | 60.0 |
How the splits are calculated
The even splits option divides your goal time in proportion to each split's distance. If a split covers 100 m of a 1500 m goal, it gets 100/1500 of the total time.
The mild negative split option starts the first split about 3% slower than average and ends the last split about 3% faster, ramping linearly in between. The splits are then rescaled so the total exactly matches your entered goal time. Negative splitting is not always the right strategy — it can be useful for pacing discipline in distance events, but many races and workouts call for even or front-loaded pacing instead.
Example 1 — 1500 m even in 25:00 at 100 m splits
Each 100 m split is 25:00 ÷ 15 = 1:40, and the cumulative column counts up in 1:40 increments.
Example 2 — 800 m negative in 12:00 at 200 m splits
Four 200 m splits ramp from about 3:05 down to about 2:55, still summing to 12:00.
Other calculators
- Find your current pace with the swim pace calculator.
- Predict a finish time from a pace with the swim time calculator.
- Explore a full pace grid in the swim pace chart.