Peak Flow Rate by Age and Height

Calculate predicted peak expiratory flow rate (PEFR) from age and height using Nunn-Gregg or NHANESIII equations and interpret asthma management zones.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Calculate predicted peak expiratory flow rate (PEFR) from age and height using Nunn-Gregg or NHANESIII equations and interpret asthma management zones

Each component has a specific meaning:

  • Age — The age recorded for the scenario being assessed.
  • Height — The height recorded for the scenario being assessed.

Note: Interpret the peak flow rate result against the thresholds and context described above.

How to Use

Enter the age, height for the scenario you are assessing. Calculate predicted peak expiratory flow rate (PEFR) from age and height using Nunn-Gregg or NHANESIII equations and interpret asthma management zones. Use the peak flow rate result to inform your calculation.

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Frequently Asked Questions