Mean Arterial Pressure from Your Blood Pressure
Updated October 2026
Mean arterial pressure (MAP) is the average pressure pushing blood through your arteries across one full heartbeat. It's not simply the midpoint between your top and bottom numbers, because the heart spends more of each cycle relaxed (diastole) than contracting (systole). The standard estimate accounts for that by weighting diastole more heavily: MAP equals your diastolic pressure plus one-third of the gap between systolic and diastolic.1
For a textbook 120/80 reading, that works out to about 93 mmHg. The reason clinicians care about MAP more than the raw numbers in certain settings is that it reflects whether blood is actually reaching and perfusing your organs. Your brain, kidneys, and other tissues need a minimum average pressure to receive adequate blood flow.
A MAP in the range of roughly 70 to 100 mmHg is generally considered adequate for perfusing the body's organs.2 A commonly cited clinical floor is around 65 mmHg — below that, organs may not receive enough blood flow, which is why critical-care teams often target a MAP of at least 65 in seriously ill patients. A persistently high MAP, on the other hand, reflects the same elevated pressure that strains the heart and vessels in high blood pressure.
Your standard reading gives two snapshots — peak and trough. MAP condenses them into the single average that best represents perfusion pressure. It's especially useful when the systolic and diastolic numbers tell different stories, or when pulse pressure (the gap between them) is unusually wide or narrow. For everyday monitoring, your regular blood pressure numbers are what you track; MAP adds a perfusion-focused lens on top.
The difference between your systolic and diastolic values — the pulse pressure — is shown here alongside MAP. A wide pulse pressure can reflect stiffer arteries, while a narrow one can appear when the heart's output is low. Reading MAP and pulse pressure together gives a richer picture than either number alone, though interpretation always belongs with a clinician who knows your history.
Use a recent, accurate blood pressure reading taken while seated and rested — MAP is only as reliable as the systolic and diastolic numbers you feed it.
Remember the 65 mmHg floor: a MAP below that is the level where organ perfusion can suffer. A genuinely low reading is a reason to seek care, not to self-manage.
Read MAP together with pulse pressure. The two numbers tell you about average perfusion and arterial stiffness respectively, and together they’re more informative.
This tool explains your numbers; it doesn’t diagnose. Bring any concerning or unusual readings to a clinician who knows your full medical history.