Spirometry Interpreter Calculator
FEV1/FVC interpretation with severity classification.
Inputs
Results
FEV1/FVC Ratio
0.71
FEV1 % Predicted67.7%
FVC % Predicted74.8%
Predicted FEV1 (L)3.69
Predicted FVC (L)4.68
Pattern (0=Normal, 1=Obstr, 2=Restr, 3=Mixed)2
Severity (0=Normal to 5=Very Severe)2
Height M1.7
Lln Ratio0.7%
How to Use This Calculator
- Enter measured FEV1 (L) and FVC (L) from your spirometry test report.
- Enter age (years), height (cm), and sex to generate predicted normal reference values.
- Review the FEV1/FVC ratio -- below 0.70 indicates airflow obstruction (COPD or asthma).
- Check FEV1 and FVC as percent of predicted to classify severity (mild >=70%, moderate 50-69%, severe <50%).
- Share results with your pulmonologist for interpretation in the context of symptoms and history.
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