Shock Index Calculator (SI, MSI, Age-SI)

Your details

Heart rate in beats per minute, measured at rest or on presentation.
bpm
The upper (systolic) number from a blood pressure reading.
mmHg
The lower (diastolic) number, used to calculate mean arterial pressure for the Modified Shock Index.
mmHg
Age in years. Used to compute the Age Shock Index (Age x HR / SBP), which weights shock severity for older patients.
years
Shock Index (SI)Normal SI
0.67

Heart rate divided by systolic blood pressure

Modified Shock Index (MSI)0.86
Mean Arterial Pressure93.3mmHg
Age Shock Index26.7
SI CategoryNormal
MSI CategoryNormal
0.67
Low<0.5Normal0.5-0.7Borderline0.7-0.9Elevated0.9-1.2High1.2+

Shock Index is 0.67: Normal.

  • A Shock Index between 0.5 and 0.7 is within the normal range, suggesting adequate hemodynamic stability at this moment.
  • The Modified Shock Index (MSI) is 0.86, within the normal range of 0.7 to 1.3.
  • Shock Index is a screening tool, not a diagnosis. Trending values over time, integrating with lactate, urine output, and the clinical examination gives the most complete picture.

Next stepContinue standard monitoring and trend the SI alongside other clinical indicators.

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