Vertical Jump Power Calculator (Sayers)
Estimate peak leg power in watts from a vertical jump height and body mass using the Sayers equation.
How it works
Peak power (W) = 60.7 × jump height (cm) + 45.3 × body mass (kg) − 2055
The Sayers equation estimates peak anaerobic leg power from just a vertical jump height and body mass, avoiding the need for a force plate. It is widely used because a countermovement jump is quick to test and repeatable. Both a higher jump and a heavier body raise the power estimate, since power is force through a distance — heavier athletes move more mass off the ground.
Worked example
A 55 cm jump at 75 kg: power = 60.7 × 55 + 45.3 × 75 − 2055 = 3338.5 + 3397.5 − 2055 = 4681 W. Divided by 75 kg, that is about 62.4 W/kg.
Frequently asked questions
Which jump test does this use?
The Sayers formula was validated for the countermovement vertical jump (a quick dip then jump). Use your best countermovement jump height in centimetres for the intended accuracy.
Why does body mass increase the power?
Power is the rate of doing work, and lifting a heavier body the same height takes more work. So for equal jump heights, a heavier athlete produces a higher absolute peak power — though power per kilogram may be lower.
How is this different from a basic vertical jump calculator?
A basic tool converts jump height between units or estimates hang time. This one applies the Sayers regression to output peak mechanical power in watts, a performance metric coaches track.
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This calculator is for educational purposes. Double-check important results before acting on them.