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Cerebral Perfusion Pressure (CPP) is the standard textbook formula for the net pressure driving blood flow to the brain: CPP = Mean Arterial Pressure (MAP) - Intracranial Pressure (ICP). The commonly cited normal range is roughly 60-80 mmHg. This calculator is for general reference and educational purposes only — it is not a medical diagnosis. Consult a doctor for actual neurocritical care assessment.
How it works
Enter mean arterial pressure and intracranial pressure (both mmHg). The tool subtracts ICP from MAP.
- Enter mean arterial pressure (mmHg).
- Enter intracranial pressure (mmHg).
- Click Calculate to see your results.
Examples
MAP 90 mmHg, ICP 10 mmHg
CPP = 90 - 10 = 80 mmHg.
Who should use it
- Reviewing neurocritical care monitoring data alongside a doctor.
- Clinical and nursing education about intracranial hemodynamics.
Industry applications
- Neurocritical care and neurosurgery reference
- Clinical education
Advantages
- Simple, transparent subtraction.
- Foundational formula in neurocritical care monitoring.
Limitations
- Requires already-measured MAP and ICP values, typically from invasive monitoring.
- A single snapshot — clinical decisions rely on trends and the full clinical picture.
Common mistakes to avoid
- Using MAP and ICP values measured at different times, which can misrepresent the true perfusion pressure.
- Treating a single CPP value as sufficient without considering the clinical trend.
Best practices
- Use simultaneously monitored MAP and ICP values for an accurate, real-time CPP figure.
Tips
- CPP should be interpreted together with ICP trends and the full clinical picture, not in isolation.