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Mean Arterial Pressure Calculator

Calculate mean arterial pressure from your blood pressure

Result

93.33 mmHg

How it is calculated

Mean arterial pressure (MAP) is the average pressure in the arteries over one heartbeat. Because the heart spends longer in diastole than in systole, the tool weights the diastolic value twice as much as the systolic: MAP = DBP + (SBP − DBP) ÷ 3, which is the same as (SBP + 2 × DBP) ÷ 3. SBP is systolic and DBP diastolic pressure, both in mmHg. Both must be above zero and systolic cannot be lower than diastolic, otherwise no result is shown. The answer is in mmHg with two decimals. It is an estimate from two cuff readings, not a direct measurement.

Worked example

A blood pressure of 120/80 mmHg is entered. The pulse pressure is 120 − 80 = 40. One third of that is 13.33. Adding it to the diastolic value gives 80 + 13.33 = 93.33 mmHg. The same answer comes from (120 + 2 × 80) ÷ 3 = 280 ÷ 3.

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Common mistakes

  • Averaging the two numbers: (120 + 80) ÷ 2 = 100. The formula weights diastolic more, so MAP is lower than the simple average.
  • Entering the values in the wrong order. Systolic is the higher number; the tool returns nothing if it is lower than diastolic.
  • Entering kPa instead of mmHg. The formula works in any unit, but the label shows mmHg, so convert your reading first if you use kPa.
  • Using one single reading taken right after exercise or stress as a baseline, instead of a calm measurement.
  • Treating the estimate as a diagnosis. The tool does not interpret the number, and a clinician decides what a value means for a patient.

About this calculator

Mean arterial pressure uses the formula MAP = DBP + ⅓(SBP − DBP), weighting diastolic pressure more heavily than systolic because the heart spends roughly two-thirds of each cardiac cycle in diastole — so MAP reflects the average pressure your organs actually experience, not just the peak.

Clinicians rely on MAP rather than plain blood pressure to judge organ perfusion: a MAP below 60 mmHg generally can't sustain adequate blood flow to the brain, heart and kidneys, which is why it's tracked continuously in ICUs, during anesthesia and in sepsis management to guide fluids and vasopressor dosing.

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