Calculator Inputs
Example Data Table
| Athlete | Mode | Distance | Time | Reaction | Stride | Cadence | Estimated Max Speed |
|---|---|---|---|---|---|---|---|
| Sprinter A | Fly segment | 30 m | 2.95 s | 0.00 s | 2.20 m | 270 spm | 10.32 m/s |
| Sprinter B | Standing start | 40 m | 5.05 s | 0.15 s | 2.05 m | 250 spm | 9.04 m/s |
| Sprinter C | Full sprint rep | 60 m | 7.10 s | 0.16 s | 2.10 m | 258 spm | 10.03 m/s |
| Sprinter D | Fly segment | 20 m | 1.92 s | 0.00 s | 2.30 m | 276 spm | 10.61 m/s |
Formula Used
1) Moving time
Moving time = measured time − reaction time.
2) Segment moving speed
Moving speed = distance ÷ moving time.
3) Mode-adjusted base speed
Base max speed = moving speed × mode multiplier.
4) Stride check speed
Stride speed = stride length × cadence ÷ 60.
5) Final estimate
Final speed = 85% base speed + 15% stride speed, when stride inputs exist.
6) Flat-equivalent correction
Corrected speed = final speed × (1 + 0.015 × grade) × (1 − 0.01 × wind).
Positive grade means uphill. Positive wind means tailwind. These are practical coaching heuristics, not laboratory biomechanical measurements.
How to Use This Calculator
Enter the measured sprint segment distance and time first. Add reaction time only when your timing includes it. Choose the measurement mode that best matches the effort.
Enter stride length and cadence for a stronger estimate. Add wind and grade only when you know the session conditions. Use acceleration phase to shape the graph and projected split table.
Press the calculation button to show the results above the form. Then export the summary as CSV or PDF for training notes.
Frequently Asked Questions
1. What does this calculator estimate?
It estimates practical maximum sprint speed from measured distance and time. It also shows pace, projected splits, stride metrics, and a simple acceleration-based speed graph for review.
2. Should I use fly segment mode?
Use fly segment mode when the timed section starts after acceleration. This mode usually reflects top speed more directly because the athlete is already moving near full sprint velocity.
3. When should I enter reaction time?
Enter reaction time when your recorded sprint time begins with a start signal. Leave it at zero for flying sprints, gates that start on movement, or manually isolated moving segments.
4. Why include stride length and cadence?
Stride length and cadence add a second speed check. They help the calculator compare movement mechanics with measured sprint data, which can improve coaching interpretation.
5. Are wind and grade corrections exact?
No. They are simple field-use adjustments. They help compare sessions more fairly, but they do not replace formal biomechanical testing or tightly controlled timing conditions.
6. What is the predicted 100m time?
It is a heuristic projection based on estimated top speed. It assumes a practical race average below maximum speed, so treat it as a planning reference, not a guaranteed result.
7. What does the power proxy mean?
The power proxy combines body mass, speed, and acceleration phase. It gives a useful training comparison metric, but it is not a direct lab-measured force plate output.
8. Can I export my results?
Yes. After calculation, use the CSV button for spreadsheet-friendly output and the PDF button for a quick report with the main metrics and chart image.