Enter the cardiac output (L/min) and the body surface area (m^2) into the Calculator. The calculator will evaluate the Cardiac Index. 

Cardiac Index Formula



  • CI is the Cardiac Index (L/min/m^2)
  • CO is the cardiac output (L/min)
  • BSA is the body surface area (m^2)

To calculate Cardiac Index, divide the cardiac output by the body surface area.

How to Calculate Cardiac Index?

The following steps outline how to calculate the Cardiac Index.

  1. First, determine the cardiac output (L/min). 
  2. Next, determine the body surface area (m^2). 
  3. Next, gather the formula from above = CI = CO / BSA.
  4. Finally, calculate the Cardiac Index.
  5. 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.

cardiac output (L/min) = 5

body surface area (m^2) = 2.5