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Plank Hold Percentile Calculator

Percentile rank for a forearm-plank hold time.

Compute an approximate percentile rank for the maximum forearm-plank hold time, using a normal model fit to common adult-fitness norm tables. Reports percentile plus a band (poor/below average/average/good/excellent).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

s
yr

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

Mean (s) = 80 − 0.5·age, SD = 30. Percentile from normal CDF approximation.

In depth

Compute an approximate percentile rank for the maximum forearm-plank hold time, using a normal model fit to common adult-fitness norm tables. Reports percentile plus a band (poor/below average/average/good/excellent).