basic

Reactive Strength Index (RSI) from Jump Height and Contact Time Calculator

RSI = jump height / ground contact time.

Calculates RSI = jump height (m) / ground contact time (s). Values >2.5 are elite; 1.5–2.5 are good; <1.5 needs improvement. Jump height from flight time: h = g·t²/8.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

m
s

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

RSI = h / t_contact

In depth

Calculates RSI = jump height (m) / ground contact time (s). Values >2.5 are elite; 1.5–2.5 are good; <1.5 needs improvement. Jump height from flight time: h = g·t²/8.