Healthy Adult
Forced Expiratory Volume in 1 second (FEV1): 3.5 liters; Forced Vital Capacity (FVC): 4.5 liters
FEV1/FVC Ratio: 0.7777777778; Interpretation: Normal (or restrictive)
FEV1/FVC Ratio Calculator
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Calculates the ratio of forced expiratory volume in 1 second (FEV1) to forced vital capacity (FVC) from spirometry, aiding lung disease diagnosis.
More tools:Health Calculators
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Forced Expiratory Volume in 1 second (FEV1) and Forced Vital Capacity (FVC) in the units shown.
Step 2
Read FEV1/FVC Ratio and Interpretation in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
Mild Obstruction
Forced Expiratory Volume in 1 second (FEV1): 2.8 liters; Forced Vital Capacity (FVC): 4.2 liters
FEV1/FVC Ratio: 0.6666666667; Interpretation: Obstructive
Moderate Obstruction
Forced Expiratory Volume in 1 second (FEV1): 2 liters; Forced Vital Capacity (FVC): 4 liters
FEV1/FVC Ratio: 0.5; Interpretation: Obstructive
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Important
Use the result as an estimate and confirm any medical decisions with a qualified professional.