Mean Arterial Pressure Calculator
MAP from systolic and diastolic, with perfusion thresholds.
Mean arterial pressure
93 mmHg
within the usual range
How the Mean Arterial Pressure Calculator works
Mean arterial pressure is the average pressure driving blood into the tissues across a full cardiac cycle. Because the heart spends roughly twice as long in diastole as in systole, MAP sits closer to the diastolic figure than a simple average would suggest.
Not medical advice. This calculator gives a general estimate, not medical advice. It cannot account for your individual health, medical history, or medication. Talk to a qualified healthcare professional before acting on any result.
Frequently asked questions
How is mean arterial pressure calculated?
MAP = diastolic + (systolic − diastolic) ÷ 3, which is equivalent to (2 × diastolic + systolic) ÷ 3. The weighting reflects the proportion of the cardiac cycle spent in diastole at a normal heart rate.
What is a normal mean arterial pressure?
Roughly 70-100 mmHg. A MAP of at least 60-65 mmHg is generally considered the minimum needed to perfuse the vital organs, which is why 65 is a common resuscitation target in sepsis guidance.
Why use MAP rather than systolic pressure?
Because organ perfusion depends on the average driving pressure, not the peak. In critical care, MAP is the value titrated against, since a high systolic with a very low diastolic can leave tissues underperfused despite a reassuring top number.
Does the formula hold at high heart rates?
Less well. The one-third weighting assumes a normal ratio of systole to diastole; at tachycardic rates diastole shortens disproportionately and the estimate drifts. Invasive arterial monitoring measures MAP directly rather than inferring it.