Shock Index
Calculate shock index from pulse and systolic pressure.
Shock Index measurements
Enter your values, then calculate.
Result
How to calculate shock index
Shock index is a clinical vital-signs ratio used to help assess the severity of blood loss or shock, calculated from heart rate and systolic blood pressure.
How the calculation works
Shock index = Heart rate ÷ Systolic blood pressure.
Example
A heart rate of 110 bpm with a systolic pressure of 100 mmHg: 110÷100 = 1.1.
Frequently asked questions
How is Result calculated?
Result = [Heart rate] ÷ [Systolic pressure].
Is the Shock Index free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Shock Index
Shock index = Heart rate ÷ Systolic blood pressure.
Let's understand your shock index result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Shock Index
- A shock index above roughly 0.9-1.0 is commonly cited as a threshold suggesting possible hemodynamic compromise, though clinical interpretation should always be done by a trained provider alongside the full clinical picture.
- This is a screening tool used alongside other clinical assessments, not a standalone diagnostic — always interpret within full clinical context.
Common Shock Index Mistakes to Avoid
- Treating shock index as a standalone diagnostic value rather than one data point among several a clinician would consider in a complete assessment.
When to Use This Calculator
Shock index is a clinical vital-signs ratio used to help assess the severity of blood loss or shock, calculated from heart rate and systolic blood pressure.