📉 Shock Index Calculator
Calculate the shock index (HR/SBP) to detect occult haemodynamic compromise.
Clinical takeaway
Useful in trauma, sepsis and obstetric haemorrhage.
Loading calculator…
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
When to use
Identify compensated shock when HR and BP look individually acceptable.
How it works
Shock index = heart rate ÷ systolic BP. Normal 0.5–0.7; ≥ 1.0 suggests significant compromise.
Key points
- Useful in trauma, sepsis and obstetric haemorrhage.
- Modified shock index (HR/MAP) and age-adjusted forms exist.
- Trends matter as much as a single value.
References
Decision support for licensed clinicians only; not a substitute for clinical judgement, diagnosis or local protocols.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Heart rate | 90 bpm |
|---|---|
| Systolic BP | 120 mmHg |
→Shock index0.75
- Normal range：0.5–0.7
- Interpretation：Within normal range.
Frequently asked questions
- What is Shock Index Calculator?
- Calculate the shock index (HR/SBP) to detect occult haemodynamic compromise.
- How is Shock Index Calculator calculated? What is the core formula?
- Shock index = heart rate ÷ systolic BP. Normal 0.5–0.7; ≥ 1.0 suggests significant compromise.
- When is Shock Index Calculator used?
- Identify compensated shock when HR and BP look individually acceptable.
- What are the key clinical points for Shock Index Calculator?
- Useful in trauma, sepsis and obstetric haemorrhage. Modified shock index (HR/MAP) and age-adjusted forms exist. Trends matter as much as a single value.
- What are the limits and cautions when using Shock Index Calculator?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Shock Index Calculator calculated in practice? Can you show a worked example?
- Inputs: Heart rate 90 bpm, Systolic BP 120 mmHg → Result: Shock index 0.75（Normal range: 0.5–0.7, Interpretation: Within normal range.）