Enter the FEV1, BMI, MMRC, and partial pressure of oxygen into the calculator to determine the bode index.

Bode Index Formula

The following formula is used to calculate the Bode Index.

BI = 0.34 * (FEV1%) + 0.54 * (BMI) + 0.13 * (MMRC) + 0.02 * (PaO2) – 0.83


  • BI is the Bode Index FEV1% is the Forced Expiratory Volume in the first second as a percentage of predicted BMI is the Body Mass Index (kg/m^2) MMRC is the Modified Medical Research Council Dyspnea Scale PaO2 is the partial pressure of oxygen in arterial blood (mmHg)

To calculate the Bode Index, multiply the FEV1% by 0.34, the BMI by 0.54, the MMRC by 0.13, and the PaO2 by 0.02. Add all these results together and then subtract 0.83 from the total.

What is a Bode Index?

A Bode Index is a measure used in the field of medicine, specifically in pulmonology, to predict the mortality rate in patients suffering from Chronic Obstructive Pulmonary Disease (COPD). It is a multidimensional grading system that takes into account the patient’s Body Mass Index (BMI), the degree of airflow Obstruction, Dyspnea (difficulty in breathing), and Exercise capacity. The higher the Bode Index, the higher the risk of death.

How to Calculate Bode Index?

The following steps outline how to calculate the Bode Index:

  1. First, determine the value of FEV1% (%). 
  2. Next, determine the value of BMI (kg/m^2). 
  3. Next, determine the value of MMRC (scale from 0 to 4). 
  4. Next, determine the value of PaO2 (mmHg). 
  5. Using the formula BI = 0.34 * (FEV1%) + 0.54 * (BMI) + 0.13 * (MMRC) + 0.02 * (PaO2) – 0.83, calculate the Bode Index.
  6. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

FEV1% = 70%

BMI = 25 kg/m^2

MMRC = 2

PaO2 = 80 mmHg