Health and clinical reference
Mean arterial pressure (MAP) calculator
Estimate mean arterial pressure and pulse pressure from systolic and diastolic blood pressure.
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For information only. This is a reference calculation, not medical advice or a diagnosis, and it must not be used to choose or adjust medicine doses. Discuss any result or health decision with a qualified clinician.
Result
Method and limits
Because the heart spends about two thirds of each cycle in diastole at resting heart rates, mean arterial pressure is estimated as diastolic pressure plus one third of the pulse pressure.
MAP ≈ DBP + (SBP − DBP) / 3 Pulse pressure = SBP − DBPAssumptions and limits
- An estimate from cuff readings; it is less accurate at fast heart rates and cannot replace an invasive arterial measurement.
Worked example
A blood pressure of 120/80 mmHg gives MAP = 80 + 40/3 = 93 mmHg and a pulse pressure of 40 mmHg.
References
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