Mean Arterial Pressure (MAP) is a single figure that represents the average pressure in a person's arteries during one full heartbeat cycle. It accounts for the time the heart spends in each phase of the beat, giving a picture of how well blood is perfusing the body's organs and tissues.
Last updated March 17, 2024 — reviewed by Dr. David Johnson, PhD and Dr. Jennifer Smith, MD.
What is Mean Arterial Pressure?
MAP Formula
MAP is commonly estimated from a standard systolic and diastolic reading using the following formula:
MAP = Diastolic Pressure + ⅓ (Systolic Pressure − Diastolic Pressure)
This calculation weights diastolic pressure more heavily, reflecting the longer time the heart spends relaxed between beats compared with the shorter contraction phase.
MAP vs. Blood Pressure: Deciphering the Differences
A standard blood pressure reading gives two numbers — systolic (the pressure during a heartbeat) and diastolic (the pressure between beats). MAP condenses these into one average value that reflects overall perfusion pressure rather than the peaks and troughs captured by systolic and diastolic figures alone.
Both measures are used together: standard readings are checked against classification charts such as the ones covered on the blood pressure chart page, while MAP offers an additional perspective on circulatory adequacy.
Why MAP Matters: The Heart's Vital Significance
MAP reflects whether organs are receiving adequate blood flow. Values that sit well outside a typical range — either notably high or notably low — can be relevant to how the heart, brain, and kidneys are being perfused, which is why the measure is discussed alongside broader blood pressure and risk factor information on this site.
For context on how blood pressure readings are typically measured and interpreted, see the measuring blood pressure guide.
Related Reading
- Blood Pressure Chart — What Do the Numbers Mean?
- Free BPExp App — log and export readings for review.
This information is provided for general educational purposes and is not a substitute for professional medical advice.