Enter the heart rate and the systolic blood pressure into the Calculator. The calculator will evaluate the Shock Index. 

Shock Index Formula



  • SI is the Shock Index (bpm/mmHg)
  • HR (bpm) is the heart rate
  • SBD (mmHG) is the systolic blood pressure

To calculate Shock Index, divide the heart rate in beats per minute by the systolic blood pressure.

How to Calculate Shock Index?

The following steps outline how to calculate the Shock Index.

  1. First, determine the heart rate. 
  2. Next, determine the systolic blood pressure. 
  3. Next, gather the formula from above = SI = HR / SBP.
  4. Finally, calculate the Shock 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.

heart rate = 150

systolic blood pressure = 60