How this calculator works
This approximation weights diastole twice as much as systole. It is most appropriate for a resting rhythm with a typical systolic-to-diastolic time ratio. A monitor that integrates an arterial waveform may give a different MAP. All pressure values here use mmHg; pulse pressure is the systolic minus diastolic difference. The result is an estimate for information only and is not medical advice.
Formula
MAP ≈ (SBP + 2 DBP) / 3; PP = SBP - DBP; SBP = 3 MAP - 2 DBP; DBP = (3 MAP - SBP) / 2.
Worked example
120/80 mmHg gives MAP 93.33 mmHg and pulse pressure 40 mmHg. A MAP of 100 with DBP 80 gives SBP 140.
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Frequently asked questions
Is this exact?
No. It approximates the time average and is less reliable when heart rate or waveform shape changes.
Can I enter kPa?
This page uses explicitly labelled mmHg fields because the unit engine does not offer mmHg.
Does MAP define a treatment target?
No. Targets depend on the clinical situation and require professional assessment.