The same athlete can earn different vertical-jump numbers on a Vertec, Just Jump Mat, laser-timing system, and Plyomat. Here is why, and how to convert a Just Jump/Vertec score to its accurate Plyomat equivalent.
Enter a Just Jump or Vertec score below. The same verified calculation applies to both, so there is no selector to create confusion.
Just Jump's verified 1.1119 flight-time factor is squared in the jump-height calculation: 1.1119² = 1.2363. Divide the Just Jump/Vertec score by 1.2363 to see the accurate Plyomat height.
Measures the gap between standing reach and the highest vane touched. Arm swing, shoulder reach, and touch technique can all add to the displayed jump-height number.
Why it can read higher: it captures reach at the top of the jump, not a surface-level contact event. Use the verified Just Jump/Vertec accuracy conversion shown above.
Uses a contact mat and applies a verified 1.1119 flight-time factor. Because jump height is proportional to flight time squared, the display becomes 1.2363 times the raw height.
Why it reads higher: that built-in factor produces approximately 23.6% more displayed jump height.
Uses a laser beam positioned above the floor rather than a surface-level contact. It is a useful contactless option, especially where a mat is not practical.
Why it can read higher: the elevated beam creates a different takeoff and landing boundary. In side-by-side comparisons, laser timing has often read about 2 to 4 inches higher than force-plate values, depending on setup and movement.
Measures the feet leaving and returning to the mat surface. It reports raw flight-time jump height, contact time, RSI, and more on the controller and in the app.
What makes it useful: a direct, repeatable surface-level reference for accurate jump height.
For Just Jump and Vertec, use the same verified accuracy conversion on this page: divide the score by 1.1119² to see the accurate Plyomat flight-time height.
That factor turns an approximately 11% flight-time adjustment into about a 23.6% difference in displayed jump height.
Laser timing belongs in the conversation for a different reason. Its elevated beam uses a different timing boundary than a surface-level force plate or mat, which is why its displayed score can also run higher. Keep the device and protocol consistent within a testing block.
Enter a Just Jump or Vertec result into the Accuracy Conversion.
Divide the score by 1.2363. The result is the accurate Plyomat flight-time reference.
Use the same device and protocol within a testing block so changes in the number reflect the athlete, not the measurement method.
| Capability | Vertec | Just Jump Mat | Laser timing | Plyomat |
|---|---|---|---|---|
| Primary method | Jump-and-reach | Flight-time contact mat | Elevated laser timing | Surface-level contact mat |
| Why scores can run high | Top-of-reach measurement | Verified 1.2363 factor | Laser beam above the floor | Raw contact event at mat surface |
| Difference vs force plate | Uses JJ/Vertec accuracy conversion | +23.6% verified | Often +2 to 4 in* | Slightly higher* |
*Observed in Plyomat side-by-side comparisons. Laser-timing results can vary with setup and athlete movement. Plyomat is only slightly higher than force-plate values.
Plyomat gives your team a clear jump-height signal, contact time, RSI, and a way to preserve Just Jump-era comparisons without burying the underlying number.
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