Pft Calculator
Calculate your Pulmonary Function Test (PFT) results including FEV1, FVC, and FEV1/FVC ratio. Useful for assessing lung health.
Published by:
isCalculator Editorial Team
Was this calculator helpful?
How to use this tool?
How to Use the PFT Calculator
This calculator determines your FEV1/FVC ratio to assess lung function patterns.
- Enter FEV1 (Forced Expiratory Volume in 1 second) in liters. Use a positive number, e.g., 2.50.
- Enter FVC (Forced Vital Capacity) in liters. Must be greater than FEV1, e.g., 3.00.
- Enter Age in years (optional for display).
- Select Gender (optional for display).
- Click Calculate.
Result: The ratio = (FEV1 ÷ FVC) × 100%. A ratio < 70% suggests an obstructive pattern (e.g., COPD, asthma). A ratio ≥ 70% indicates normal or restrictive pattern.
All inputs must be positive numbers, and FVC must exceed FEV1.
Previous Results
| Result | Inputs | Date |
|---|
Frequently Asked Questions
Pulmonary Function Test (PFT) measures lung function, including how much air you can inhale and exhale.
A ratio less than 70% often indicates obstructive lung disease like COPD or asthma.
Normal FEV1/FVC ratio is typically above 70-80% depending on age and gender.
