Mean Arterial Pressure (MAP) Calculator
Mean arterial pressure (MAP) is the average pressure in the arteries over one cardiac cycle and reflects perfusion of the organs. It is estimated as diastolic pressure plus one-third of the pulse pressure: MAP = (systolic + 2 × diastolic) ÷ 3.
Quick answer
Mean arterial pressure (MAP) is the average arterial pressure across a heartbeat and reflects organ perfusion. It is estimated from a blood-pressure reading as MAP = (systolic + 2 × diastolic) ÷ 3. A MAP of about 70–100 mmHg is commonly cited as normal, and 65 mmHg is a frequent resuscitation target.
Blood pressure
How to use the Mean Arterial Pressure calculator
- 1Enter the blood pressure. Enter the systolic and diastolic blood pressure in mmHg.
- 2Read the MAP. The tool applies MAP = (systolic + 2 × diastolic) ÷ 3 and shows the result in mmHg.
- 3Interpret in context. A MAP around 70–100 mmHg is commonly cited as normal; many guidelines use 65 mmHg as an initial target in shock. Interpretation belongs to a clinician.
Medical disclaimer: This is general health information, not medical advice. It does not diagnose or treat any condition, and the results are estimates based on public reference formulas. Always consult a qualified doctor about your individual health. If you think you may have a medical emergency, contact your local emergency services immediately.
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Book a consultationFrequently asked questions
What is a normal mean arterial pressure?⌄
A MAP of roughly 70–100 mmHg is commonly cited as normal for perfusing the organs. The exact target depends on the clinical situation and the individual patient.
Why is 65 mmHg used as a MAP target?⌄
In conditions like septic shock, the Surviving Sepsis Campaign suggests an initial MAP target of at least 65 mmHg to maintain organ perfusion. The target is individualised by the treating team.
Why is diastolic weighted twice in the formula?⌄
The heart spends about two-thirds of each cardiac cycle in diastole, so the standard estimate weights diastolic pressure twice as much as systolic: MAP = (SBP + 2 × DBP) ÷ 3.
Sources & validation
This calculator reproduces the published Mean Arterial Pressure score, validated for estimation of mean arterial pressure (organ perfusion pressure) from a blood-pressure reading.
- Standard haemodynamic definition: MAP = DBP + ⅓(SBP − DBP) = (SBP + 2·DBP)/3 (e.g. Sesso HD et al., Hypertension 2000;36:801-807, on MAP and cardiovascular risk) — verified 2026-06-18
- Evans L, Rhodes A, Alhazzani W, et al. Surviving Sepsis Campaign 2021 — an initial MAP target of ≥ 65 mmHg in septic shock (Crit Care Med 2021;49:e1063-e1143) — verified 2026-06-18
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