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FEV1/FVC Ratio Calculator
Evaluate spirometry results and airway obstruction status
Spirometry Guidelines: The FEV1/FVC ratio compares the volume exhaled in the first second (FEV1) to the total forced vital capacity (FVC). A ratio below 0.70 (or 70%) post-bronchodilator typically indicates airflow obstruction (e.g., COPD or asthma). Enter values below.
Spirometry Parameters Input
Calculation Results
⚠️ Not medical advice. For pulmonology, respiratory therapy, and clinical reference only. Spirometry interpretation, diagnosis of obstructive or restrictive ventilatory defects, and treatment plans must be evaluated by a qualified physician or pulmonologist.