How is MAP different from blood pressure?

Blood pressure is reported as two numbers — systolic and diastolic. MAP combines them into a single average that reflects the pressure actually perfusing your organs. Because the heart rests longer than it contracts, MAP is weighted toward the diastolic value rather than being a simple midpoint.

Why isn't MAP just the average of my two numbers?

Because your heart spends roughly twice as long in the diastolic (relaxation) phase as in the systolic (contraction) phase. The MAP formula reflects this by adding one-third of the pulse pressure to the diastolic value, giving more weight to diastolic pressure than a simple average would.

Is a low MAP dangerous?

A MAP below about 60 to 65 mmHg may mean your organs are not receiving enough blood flow, which can be serious, particularly if you feel dizzy, confused or faint. Persistent or symptomatic low MAP should be assessed by a doctor without delay.

Can I use MAP to monitor my blood pressure at home?

MAP can be a useful summary, but for home monitoring it is best to track your actual systolic and diastolic readings, which is what guidelines and doctors use. Use MAP as additional context rather than a replacement for standard blood pressure readings.

Heart & CardiovascularGlobal

Mean Arterial Pressure (MAP) Calculator

Calculate your mean arterial pressure — the average pressure in your arteries through one heartbeat, and a key indicator of whether your organs are getting enough blood flow.

Written byAikins Apreku

Reviewed byDeborah Adotso, General Nurse

Updated June 2026

Systolic (top number) (mmHg)

Diastolic (bottom number) (mmHg)

What is mean arterial pressure?

Mean arterial pressure (MAP) is the average pressure in your arteries during a single cardiac cycle. It is not simply the midpoint between your systolic and diastolic readings, because your heart spends more time in the relaxation (diastolic) phase than in the contraction (systolic) phase. MAP is important because it reflects the pressure actually driving blood to your organs and tissues. A MAP that is too low means organs may not get enough blood; too high means excess strain on the cardiovascular system.

How MAP is calculated

This calculator uses the standard clinical formula: MAP equals the diastolic pressure plus one-third of the difference between systolic and diastolic (the pulse pressure). For a typical reading of 120 over 80, the MAP works out to about 93 mmHg. This formula is a good approximation at normal heart rates. In clinical settings, monitors may calculate MAP directly from the pressure waveform, which can differ slightly, especially at very high or low heart rates.

What is a healthy MAP?

A normal mean arterial pressure for most adults is between 70 and 100 mmHg. A MAP of at least 60 to 65 mmHg is generally considered the minimum needed to keep vital organs, such as the brain and kidneys, adequately supplied with blood. Values above 100 to 110 mmHg suggest elevated blood pressure and increased cardiovascular strain. Like any single measurement, MAP is most meaningful when interpreted alongside your overall blood pressure pattern and health.

Why MAP matters in healthcare

Mean arterial pressure is widely used in hospitals and intensive care because it is a better indicator of organ perfusion than systolic pressure alone. Clinicians often aim to keep a patient's MAP above a target threshold to ensure organs receive enough blood, particularly during serious illness or surgery. For everyday purposes, MAP offers a useful single summary of your blood pressure, but it does not replace a proper blood pressure assessment by a healthcare professional.

Frequently Asked Questions

A normal MAP for most adults is between 70 and 100 mmHg. A minimum of around 60 to 65 mmHg is generally needed to adequately supply blood to vital organs. Values above 100 to 110 mmHg suggest elevated blood pressure that may warrant attention.

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Sources & References

1.American Heart Association. Understanding Blood Pressure Readings.
2.Sesso HD, et al.. Systolic and diastolic blood pressure, pulse pressure, and mean arterial pressure as predictors of cardiovascular disease risk.
3.StatPearls / NCBI. Mean Arterial Pressure.

LifeCheckIQ content is based on peer-reviewed research, recognised clinical guidelines, and authoritative medical sources, and is reviewed by Deborah Adotso, General Nurse, for clinical accuracy.

Medical Disclaimer: This tool is for informational and educational purposes only. Results are not a medical diagnosis. Always consult a qualified healthcare professional for medical advice, diagnosis, or treatment. In an emergency, call your local emergency number or visit the nearest hospital immediately.