Input Form
Example Data Table
| Athlete | Body Mass (kg) | Jump Height (cm) | Takeoff Time (s) | Peak Power (W) | Relative Power (W/kg) |
|---|---|---|---|---|---|
| Sprinter A | 68 | 52 | 0.27 | 4158.54 | 61.16 |
| Midfielder B | 74 | 46 | 0.30 | 4052.32 | 54.76 |
| Forward C | 82 | 43 | 0.33 | 4052.42 | 49.42 |
| Guard D | 88 | 38 | 0.36 | 3992.84 | 45.37 |
Formula Used
1. Jump height from flight time: Jump Height (m) = g × flight time² / 8
2. Takeoff velocity: Velocity = √(2 × g × jump height)
3. Average force: Average Force = total mass × ((velocity / takeoff time) + g)
4. Work: Work = total mass × g × displacement
5. Average power: Average Power = work / takeoff time
6. Peak power: Peak Power = (60.7 × jump height in cm) + (45.3 × body mass) - 2055
7. Relative power: Relative Power = peak power / body mass
8. Modified RSI: RSI-mod = jump height / takeoff time
Arm swing and effort factors scale peak power for realistic field testing. Repeat power uses a simple fatigue penalty tied to repetitions and rest.
How to Use This Calculator
- Enter body mass and any external load used during the jump.
- Provide measured jump height, or enter flight time instead.
- Add takeoff time from a force plate, app, or contact mat.
- Set displacement, repetitions, rest, and effort adjustments.
- Submit the form to view power, force, readiness, and profile band.
- Use the export buttons to download a CSV sheet or PDF report.
FAQs
1. What does explosive power mean in training?
Explosive power describes how quickly an athlete can produce force. It combines speed and strength, making it useful for sprinting, jumping, throwing, and rapid changes of direction.
2. Can I use flight time instead of jump height?
Yes. If flight time is entered, the calculator estimates jump height automatically. This is useful when testing with contact mats, timing systems, or video-based jump apps.
3. Why is body mass included in the peak power formula?
Body mass affects the mechanical demand of leaving the ground. The peak power equation accounts for mass so larger athletes are compared more fairly when jump height alone is not enough.
4. What is relative power?
Relative power is peak power divided by body mass. It helps compare athletes of different sizes and is often more useful than absolute watts for field sport performance decisions.
5. Does external load change the result?
Yes. Extra load changes total system mass, which affects force, work, and average power. It can help evaluate loaded jump profiles and strength-speed qualities across training phases.
6. Is the readiness score a medical assessment?
No. It is only a training indicator built from power, RSI-mod, and experience inputs. It supports session planning but does not diagnose fatigue, injury, or health conditions.
7. Which test setup works best?
A force plate is strongest for detailed analysis, but jump mats and validated mobile apps can still provide useful results. Consistent setup matters more than expensive equipment alone.
8. How often should I test explosive power?
Most teams test weekly or biweekly during heavy training blocks. Shorter monitoring cycles can work when fatigue management is critical, as long as testing conditions stay consistent.