Mean Arterial Pressure (MAP) Calculator

Calculate Mean Arterial Pressure (MAP) from systolic and diastolic blood pressure. MAP ≥ 65 mmHg is generally accepted as the threshold for adequate end-organ perfusion.

For educational and clinical reference. Not a substitute for medical judgment.
Mean Arterial Pressure
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Perfusion
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References

  1. Evans L, Rhodes A, Alhazzani W, et al. Surviving Sepsis Campaign: International Guidelines for Management of Sepsis and Septic Shock 2021. Crit Care Med. 2021;49(11):e1063-e1143.
  2. Magder SA. The highs and lows of blood pressure: toward meaningful clinical targets in patients with shock. Crit Care Med. 2014;42(5):1241-1251.

How to use

  1. Enter systolic blood pressure (SBP) and diastolic blood pressure (DBP) in mmHg.
  2. The calculator shows MAP and perfusion classification immediately.
  3. Use the copy button to copy the value.

Frequently asked questions

How is Mean Arterial Pressure calculated?

MAP = (SBP + 2 × DBP) / 3. It approximates the average pressure during the cardiac cycle, weighted to reflect that diastole lasts roughly twice as long as systole.

What is the minimum MAP for organ perfusion?

A MAP ≥ 65 mmHg is generally considered necessary for adequate tissue perfusion in critically ill patients, per the Surviving Sepsis Campaign guidelines.

When should I use MAP instead of systolic blood pressure?

MAP better reflects organ perfusion pressure than systolic blood pressure alone. It is the preferred target in shock, sepsis, neurocritical care, and during anesthesia.

Is this a substitute for clinical judgment?

No. This calculator is for educational and clinical reference only.

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