How does the FEV1 Spirometry Calculator work?

FEV1/FVC < 0.70 → obstruction (COPD, asthma) Then: FEV1 ≥ 80% predicted = normal Then: FEV1 70–79% = mild obstruction Then: FEV1 50–69% = moderate · FEV1 < 50% = severe.

Can you give an example of how to use the FEV1 Spirometry Calculator?

Example: Input FEV1=2.5L · FVC=3.2L · predicted FEV1=3.5L gives a result of FEV1/FVC=0.78 → obstruction · 71% of predicted → moderate (Both ratio and % predicted needed for staging).

Is the FEV1 Spirometry Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the FEV1 Spirometry Calculator?

Our FEV1 Spirometry Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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FEV1 Spirometry Calculator

🫁FEV1 Spirometry Calculator

FEV1 (L)

FVC (L)

Age

Height (cm)

FEV1 (Forced Expiratory Volume in 1 second) is the volume of air expelled in the first second of a forced breath out. FEV1/FVC ratio (Tiffeneau index) < 0.70 is diagnostic of obstructive lung disease. FEV1 < 80% predicted indicates airflow limitation.

Stage	FEV1 % predicted	Severity
GOLD 1	>= 80%	Mild
GOLD 2	50–79%	Moderate
GOLD 3	30–49%	Severe
GOLD 4	< 30%	Very severe

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Did You Know?

COPD (the leading cause of reduced FEV1) affects over 300 million people worldwide and is the third leading cause of death. Spirometry can detect it years before symptoms appear.

References

›Spirometry — Wikipedia
›GOLD COPD staging

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FEV1 Spirometry Calculator

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GOLD COPD staging by FEV1 % predicted

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