Enter the pulsatile signal (AC) and the nonpulsatile signal (DC) into the Calculator. The calculator will evaluate the Perfusion Index. 

Perfusion Index Formula

PI = PS / NS * 100


  • PI is the Perfusion Index (%)
  • PS is the pulsatile signal (AC)
  • NS is the nonpulsatile signal (DC)

To calculate Perfusion Index, divide the pulsatile signal by the nonpulsatile signal, then multiply by 100.

How to Calculate Perfusion Index?

The following steps outline how to calculate the Perfusion Index.

  1. First, determine the pulsatile signal (AC). 
  2. Next, determine the nonpulsatile signal (DC). 
  3. Next, gather the formula from above = PI = PS / NS * 100.
  4. Finally, calculate the Perfusion 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.

pulsatile signal (AC) = 400

nonpulsatile signal (DC) = 300