FEV1 to FVC Ratio Calculator

This calculator computes the ratio of Forced Expiratory Volume in 1 second (FEV1) to Forced Vital Capacity (FVC), which is a key measure in pulmonary function tests to assess lung function and diagnose conditions like asthma and COPD.

Input Parameters

Calculation Results

FEV1/FVC Ratio

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Interpretation

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Calculation Formula

FEV1/FVC = FEV1 / FVC

Where:
FEV1 = Forced Expiratory Volume in 1 second
FVC = Forced Vital Capacity

FEV1 to FVC Ratio Calculator Calculator Usage Guide

Learn how to use the FEV1 to FVC Ratio Calculator and its working principles

How to Use the Calculator

  1. Enter the value for Forced Expiratory Volume in 1 second (FEV1) in liters.
  2. Enter the value for Forced Vital Capacity (FVC) in liters.
  3. Click the "Calculate" button to compute the FEV1/FVC ratio.
  4. View the result and interpretation provided by the calculator.

Understanding the Results

The FEV1/FVC ratio is a key measure in pulmonary function tests. It helps in assessing lung function and diagnosing conditions like asthma, chronic obstructive pulmonary disease (COPD), and other respiratory disorders.

Interpretation of Results

  • Normal: Ratio ≥ 0.70 - Lung function is within normal limits
  • Mild Obstruction: Ratio between 0.50 and 0.69 - Possible early signs of lung disease
  • Moderate Obstruction: Ratio between 0.30 and 0.49 - Clear signs of lung disease
  • Severe Obstruction: Ratio < 0.30 - Significant impairment of lung function

Important Notes

These calculations should be used as a guide only. For a comprehensive assessment of lung function, it is recommended to consult with a healthcare professional who can interpret the results in the context of your overall health and medical history.