How to use this calculator
- Enter a measured serve speed.
- Add body weight and ball mass.
- Use a consistent acceleration-window assumption.
- Track the proxy beside serve percentage, placement, and symptoms.
#2808 · Sports & Gaming Tool
Tennis Rating Power to Weight Calculator
Create a repeatable serve-output proxy from serve speed, body mass, ball mass, and estimated acceleration time. The main result is estimated ball power per kilogram, supported by kinetic energy and a speed-to-mass ratio. It describes the ball's translational energy over time—not the athlete's total muscular power—and should be used mainly for consistent personal tracking.
Calculator
Enter your session dataFormula
Ball energy = ½ × ball mass × serve speed². Estimated ball power = energy ÷ acceleration window. Power-to-weight proxy = estimated ball power ÷ body mass.
What the result means
A higher ratio means more estimated ball energy per unit time relative to body mass under the entered assumptions. Placement, spin, consistency, return pressure, and movement remain essential to tennis performance.
This simplified proxy is not a biomechanics assessment. Do not pursue higher values through unsafe serving volume, technique, or weight loss.
Example calculation
At 105 mph, 165 lb, ball mass 57.7 g, and a 0.12-second window, ball kinetic energy is 63.6 J, estimated ball power is 530 W, and the power-to-weight proxy is 7.1 W/kg.
Tips for better results
- Compare serves measured with the same device.
- Warm up and cap maximum-effort attempts.
- Track first-serve percentage with speed.
- Do not interpret a lower body weight as automatically better.
- Stop serving if shoulder or elbow pain develops.
Frequently asked questions
Is this my actual muscular power during the serve?
No. It estimates ball kinetic energy per unit time and normalizes that proxy by body mass.
Why is player rating included?
It provides context for a saved result but does not change the physics calculation.
Does spin affect the result?
The calculator includes translational speed only and does not include rotational energy from spin.
Can I compare different radar devices?
Device differences can distort the trend, so consistent equipment and setup are preferable.
Is a higher power-to-weight proxy always better?
No. Serve accuracy, spin, tactical use, durability, and safety can matter more than maximum speed.
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Variables and assumptions
| Variable | Meaning |
|---|---|
| Serve speed | Ball speed converted from mph to m/s. |
| Ball mass | Entered grams converted to kilograms. |
| Ball energy | Translational kinetic energy only. |
| Acceleration window | User assumption used to estimate power from energy. |