How is the Bosco Elasticity Index calculated in EzeJump?

Updated 19 October 2026

The Bosco elasticity index measures an athlete's ability to utilize elastic energy during a jump. It's calculated by comparing the height of a countermovement jump (CMJ) with a squat jump (SJ). The formula is: ((CMJ - SJ) / CMJ) x 100. A higher elasticity index suggests greater reliance on elastic energy for jumping. Elasticity Index Calculation:


The formula ((CMJ - SJ) / CMJ) x 100 is used to calculate the elasticity index. 
  • (CMJ - SJ): This difference represents the amount of jump height gained by utilizing elastic energy. 
  • CMJ: This is the denominator, representing the total jump height. 
  • x 100: This converts the result into a percentage. 

 

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