Enter Lap Data
Example Data Table
| Lap | Distance | Lap Time | Cumulative Time | Pace per 100 m |
|---|---|---|---|---|
| 1 | 400 m | 01:34 | 01:34 | 00:24 |
| 2 | 400 m | 01:32 | 03:06 | 00:23 |
| 3 | 400 m | 01:31 | 04:37 | 00:23 |
| 4 | 400 m | 01:29 | 06:06 | 00:22 |
| 5 | 400 m | 01:30 | 07:36 | 00:23 |
| 6 | 400 m | 01:28 | 09:04 | 00:22 |
Formula Used
Total Distance = Lap Distance × Completed Laps.
Average Lap Time = Sum of Lap Times ÷ Completed Laps.
Average Pace = Moving Time ÷ (Total Distance ÷ Pace Basis).
Consistency Score = 100 − [(Standard Deviation ÷ Average Lap Time) × 100]. Higher values indicate steadier pacing.
Lap Balance = (Fastest Lap ÷ Slowest Lap) × 100. Values closer to 100% show more even laps.
Projected Time = (Moving Time ÷ Total Distance) × Projected Distance.
Split Trend compares the first-half average against the second-half average. A faster second half is a negative split.
How to Use This Calculator
- Choose your activity, unit, lap distance, and planned lap count.
- Enter manual lap times line by line for the most accurate analysis.
- If you only know total time, leave manual laps blank and enter total time instead.
- Add rest or transition time when you want total event time reported separately.
- Enter a goal time to compare your current pace against a target pace.
- Add a projected distance to estimate your finish time at the current effort.
- Submit the form to display results above the form and below the header.
- Use the export buttons to save a CSV file or PDF report.
Frequently Asked Questions
1. What does this lap time calculator measure?
It measures lap-by-lap timing, average pace, fastest and slowest laps, split trend, consistency score, lap balance, projected finish time, and target pace comparison.
2. Can I use it for swimming and cycling?
Yes. Enter the lap distance and times for swimming, cycling, running, rowing, skating, or any repeated interval session with measurable laps.
3. What happens if I enter manual laps and total time?
Manual lap entries take priority because they provide the most accurate split analysis. Total time is only used to derive equal laps when no manual laps are provided.
4. What is a good consistency score?
A higher percentage means steadier pacing. Scores above 90% usually indicate very even laps, while lower scores suggest larger fluctuations between laps.
5. Why does the pace use 100 meters sometimes?
When meters are selected, pace is shown per 100 meters because that is a practical benchmark for track repeats and swimming sets.
6. What is a negative split?
A negative split means your second half was faster than your first half. It often reflects controlled pacing and stronger finishing effort.
7. Can I export my results?
Yes. After calculating, use the CSV button for spreadsheet-ready data or the PDF button for a printable summary and lap table.
8. Does rest time change average lap pace?
No. Average lap pace is based on moving time only. Rest time is added separately to event time so you can track both efforts clearly.