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Peak Expiratory Flow (Wright Formula) Calculator

PEF predicted from age, height, and sex — Wright nomogram.

Predicts peak expiratory flow rate (PEFR) using the Wright formula based on age, height, and sex. Useful for assessing asthma severity.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

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

PEF ≈ 3.95×H − 0.025×A² + gender_factor (L/min)

In depth

Predicts peak expiratory flow rate (PEFR) using the Wright formula based on age, height, and sex. Useful for assessing asthma severity.