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Peak Flow Calculator — Free Online Tool
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Peak Flow Calculator

Calculate asthma peak expiratory flow (PEF) traffic light zones

Pulmonary Guidelines: Peak Expiratory Flow (PEF) monitoring uses a traffic light system based on your Personal Best score. Green Zone is 80–100% (good control), Yellow Zone is 50–79% (caution/asthma worsening), and Red Zone is below 50% (medical alert). Enter values below.
Peak Flow Parameters Input

Calculation Results

⚠️ Not medical advice. For pulmonology, respiratory care, and clinical reference only. Asthma action plans and peak flow monitoring thresholds must be supervised strictly by a qualified physician or pulmonologist.

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