MAP Calculator (Mean Arterial Pressure)
HealthCalculate mean arterial pressure (MAP) from systolic and diastolic blood pressure to check organ perfusion adequacy, with normal range context.
Systolic Blood Pressure
mmHg
Diastolic Blood Pressure
mmHg
Mean Arterial Pressure
0mmHg
Perfusion Category
—
Not a substitute for clinical monitoring. A single MAP reading should be interpreted alongside trends and other vital signs by a qualified healthcare provider.
What is a MAP?
The MAP Calculator computes mean arterial pressure from your systolic and diastolic blood pressure readings using the standard clinical formula. Mean arterial pressure represents the average pressure driving blood through the arteries over a full cardiac cycle, and it's widely used as a key indicator of organ perfusion adequacy in critical care and anesthesia.
Enter your systolic and diastolic blood pressure below to see your MAP and a general perfusion category. For a related tool that classifies your full blood pressure reading, see the Blood Pressure Calculator; for a related neurocritical care calculation, see the Cerebral Perfusion Pressure Calculator.
How to use this MAP calculator
- Enter your Systolic Blood Pressure in mmHg.
- Enter your Diastolic Blood Pressure in mmHg.
- Review your Mean Arterial Pressure and Perfusion Category, and discuss any concerning readings with a healthcare provider.
Formula & Methodology
Mean arterial pressure is calculated as: MAP = DBP + (SBP − DBP) ÷ 3 where DBP is diastolic blood pressure and SBP is systolic blood pressure, both in mmHg. A MAP of approximately 70-100 mmHg is generally considered normal, while a MAP below approximately 60 mmHg is widely cited in critical care as insufficient to reliably perfuse vital organs. Worked example: A blood pressure reading of 120/80 mmHg gives a MAP of 80 + (120 − 80) ÷ 3 = 80 + 13.3 = 93.3 mmHg, falling within the normal 70-100 mmHg range.
Frequently Asked Questions
Mean arterial pressure is the average pressure in a person's arteries during one complete cardiac cycle, accounting for the fact that the heart spends more time in diastole (relaxation) than systole (contraction). It's considered a better indicator of average tissue perfusion pressure than either systolic or diastolic pressure alone.
Because the heart spends roughly two-thirds of each cardiac cycle in diastole and only about one-third in systole, the MAP formula gives diastolic pressure double the weight of the difference between systolic and diastolic pressure. This is why the formula adds only one-third of the pulse pressure to the diastolic value rather than averaging systolic and diastolic equally.
A MAP of approximately 70-100 mmHg is generally considered normal in a healthy adult. This calculator's Normal category reflects that commonly cited range, though your own baseline may vary based on age and health status.
A MAP below approximately 60 mmHg is widely cited in critical care as insufficient to reliably perfuse vital organs such as the brain, kidneys, and heart, increasing the risk of organ dysfunction. This threshold is commonly used as a target in critical care and anesthesia settings, though individualized targets can vary by patient and clinical context.
MAP is commonly monitored in intensive care units, during anesthesia, and in patients on blood pressure-supporting medications (vasopressors), where clinicians often target a specific MAP rather than systolic or diastolic pressure alone. It's also used in assessing conditions like sepsis, shock, and traumatic brain injury, where organ perfusion is a key concern.
The [Blood Pressure Calculator](/blood-pressure-calculator/) classifies your systolic and diastolic readings into standard blood pressure categories (normal, elevated, hypertension stages), while this MAP Calculator focuses specifically on the single mean arterial pressure value and its role in organ perfusion. They serve complementary but distinct purposes.
Yes — if your blood pressure monitor displays systolic and diastolic values, you can enter them directly into this calculator to get your MAP. Some advanced monitors and arterial line systems also display MAP directly, calculated the same way.
Yes — MAP, like blood pressure generally, can shift with body position, physical activity, stress, and time of day, so a single reading is a snapshot rather than a definitive measure of your baseline. Clinicians typically look at trends over time rather than relying on one isolated reading.
No — this calculator is for informational and educational purposes only and simply applies the standard MAP formula to the numbers you enter. Diagnosing low blood pressure, shock, or any medical condition requires a full clinical evaluation by a qualified healthcare provider, not just a single calculated number.
Yes — cerebral perfusion pressure, calculated by the [Cerebral Perfusion Pressure Calculator](/cerebral-perfusion-pressure-calculator/), is derived from MAP minus intracranial pressure, making MAP a direct input into that related calculation. Both are important in the management of traumatic brain injury and other neurocritical conditions.
They're related but distinct hemodynamic parameters — MAP reflects arterial pressure, while the [Cardiac Index Calculator](/cardiac-index-calculator/) reflects how much blood the heart pumps relative to body size. Both are often assessed together in critical care to build a complete hemodynamic picture.
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