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Calculators
Health Calculators
Pulmonary
FEV1/FVC Ratio

FEV1/FVC Ratio

Assess obstructive vs restrictive lung disease.

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About FEV1/FVC Ratio

The FEV1/FVC Ratio is a cornerstone spirometry parameter used to evaluate lung function and differentiate between various respiratory conditions. This essential tool calculates the proportion of Forced Expiratory Volume in 1 second (FEV1) to Forced Vital Capacity (FVC), typically presented as a decimal or percentage. It is indispensable for healthcare professionals, including pulmonologists, general practitioners, and respiratory therapists, in diagnosing and managing lung diseases. A significantly reduced FEV1/FVC ratio is a primary indicator of obstructive lung diseases such as COPD or asthma, signifying airflow limitation. Conversely, a normal or elevated ratio, often alongside a diminished FVC, may suggest a restrictive pattern. This ratio offers critical diagnostic insight, guiding appropriate clinical management and patient care strategies.

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Calculate physiological dead space in lungs.
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Pediatric ETT sizing by age and weight.
Medical Disclaimer
This tool is for educational and screening purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.
Spirometry Measures

FEV1 / FVC Ratio

78 %
NORMAL OR RESTRICTIVE PATTERN