Vertical Jump Calculator

The vertical jump is the standard field test of lower-body explosiveness, and this calculator converts your result into both height and peak power. Height comes from the jump-and-reach method — standing reach subtracted from the highest chalk mark — or from flight time with h = g × t² ÷ 8. Power estimates use the Sayer and Lewis equations, which combine body mass and jump height into peak watts. Worked example: an 80 kg athlete jumping 50 cm generates Lewis power of roughly 5,530 W and a Sayer estimate near 6,870 W; the same jump by a 60 kg athlete produces about 4,150 Lewis watts, which is why power formulas report both height and watts. Norms frame the result: average active men jump 40–50 cm, trained athletes 50–60 cm and elite basketball and volleyball players top 70 cm.

1. 1

   Measure your jump

   Jump-and-reach difference or contact-mat flight time

2. 2

   Enter body weight

   Mass feeds the power estimates alongside height

3. 3

   Read height and power

   Centimeters, watts and your percentile band

• 1

  Warm up thoroughly — cold tests read 3–5 cm low

• 2

  Best of three attempts is the standard score

• 3

  Same method each test: reach and flight-time differ by 2–4 cm

• Tucking knees mid-air to inflate flight time

• Comparing no-step and approach jumps directly

• Testing after heavy leg sessions

• Stepping instead of jumping off both feet