Peak Flow Calculator - Estimated Peak Expiratory Flow

Your details

Biological sex determines which reference equation is used for adults.
Ages 5-14 use the Godfrey child formula; ages 15-85 use Nunn and Gregg adult equations.
years
Height in centimetres.
cm
Best of three blows on your peak flow meter. Leave at 0 to skip the zone comparison.
L/min
Your highest ever PEF reading when well, used alongside predicted for zone calculations.
L/min
Predicted PEF
638L/min

Reference PEF for your age, sex and height (Nunn-Gregg / Godfrey)

Predicted PEF: 638 L/min

  • Your predicted PEF of 638 L/min is calculated using the Nunn and Gregg (1989) adult equations.

Next stepAdd your measured PEF reading to see your zone status and percentage of predicted.

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