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Vertical Jump Power (Sayers) Calculator

Estimate peak leg power from your vertical jump

How it is calculated

Enter the vertical jump height in centimetres and body mass in kilograms. The tool applies the Sayers equation P = 60.7 × jump + 45.3 × mass − 2055, where P is the estimated peak power in watts. The result is rounded to a whole watt. Both inputs must be above zero, and if the equation gives zero or a negative number (for a very low jump and a light body) the tool returns nothing. The equation was fitted to countermovement jumps, where you dip down before jumping, so it is an estimate of peak anaerobic power rather than a lab measurement, and it gives only total watts, not watts per kilogram.

Worked example

An athlete weighing 75 kg jumps 50 cm. The jump term is 60.7 × 50 = 3,035. The mass term is 45.3 × 75 = 3,397.5. Add them: 3,035 + 3,397.5 = 6,432.5. Subtract 2,055: 6,432.5 − 2,055 = 4,377.5, which rounds to 4,378 W. Dividing by body mass gives about 58 W/kg, if you want a figure to compare athletes of different sizes.

Try this example →

Common mistakes

  • Entering the jump height in inches. The equation uses centimetres, so a 20 inch jump must be typed as about 51 cm, or the power will be far too low.
  • Using a standing reach or a jump-and-reach score as jump height. Enter only the height gained by the jump, not the total reach.
  • Entering body mass in pounds. The tool expects kilograms, so divide pounds by 2.2046 first.
  • Comparing results from different jump styles. The equation was built from countermovement jumps, so a squat jump or a running-approach jump gives numbers that are not comparable.

Sources

About this calculator

This calculator applies the Sayers equation, P (W) = 60.7 × jump height (cm) + 45.3 × body mass (kg) − 2055, developed by Sayers et al. (1999) from force-plate studies correlating countermovement vertical jump height and body mass with directly measured peak anaerobic power output.

Strength and conditioning coaches use it as a field-test alternative to expensive force-plate or Wingate testing — a jump mat or simple vertical-jump measurement plus a bathroom scale is enough to estimate an athlete's explosive leg power, track it across a training cycle, and compare it against normative data for sports like basketball, volleyball, and sprinting.

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Comments (1)

  • Editorial team

    The equation rewards body mass as well as jump height, so compare an athlete only with their own earlier results unless you want to confuse mass with power. Keep the test conditions fixed: same surface, same countermovement style and measuring method. With 75 kg, a 50 cm jump gives 4,378 W and a 60 cm jump gives 4,985 W. How do you measure jump height, with a mat, a wall reach or a phone app?

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