Medical Diagnostics & Clinical Scoring

Mean Arterial Pressure (MAP)

Calculate Mean Arterial Pressure (MAP) from systolic and diastolic blood pressure to estimate average arterial pressure across a cardiac cycle.

Mean Arterial Pressure
93.3
Pulse Pressure40 mmHg
InterpretationTypical adult resting range
Calculation StepsMAP = 80 + (120 - 80) / 3 = 93.3 mmHg

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Mean arterial pressure formula

Mean Arterial Pressure (MAP) estimates the average arterial pressure over one cardiac cycle. It is commonly calculated from systolic and diastolic blood pressure:

MAP = DBP + 1/3(SBP - DBP)

MAP = DBP + 1/3(SBP - DBP)

Where:
SBP=
Systolic Blood Pressure (mmHg).
DBP=
Diastolic Blood Pressure (mmHg).

How to calculate MAP

  1. Subtract diastolic pressure from systolic pressure to get pulse pressure.
  2. Divide pulse pressure by 3.
  3. Add the result to diastolic pressure.

For a blood pressure of 120/80:

MAP = 80 + (120 - 80) / 3 = 93.3 mmHg

Clinical context

MAP is used in critical care, anesthesia, and emergency medicine as one marker of perfusion. Many shock protocols use an initial target around 65 mmHg, but targets vary by patient, condition, and clinician judgment.

This calculator is educational and should not replace clinical assessment or monitored blood pressure data.

Frequently Asked Questions

MAP is the average pressure in a patient's arteries during a single cardiac cycle. It is considered a better indicator of perfusion to vital organs than systolic blood pressure alone.

The formula is (2 * DBP + SBP) / 3, or DBP + 1/3(Pulse Pressure). Diastolic pressure is doubled in the calculation because the heart spends approximately twice as much time in diastole (resting and filling) as it does in systole (pumping).

A normal MAP is typically between 70 and 100 mmHg. A MAP of at least 60-65 mmHg is necessary to ensure enough blood flow to the brain, heart, and kidneys.

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