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What is the mean arterial pressure? The mean arterial pressure (MAP) is defined as an approximation of a time-weighted average of blood pressure values in large system arteries during the cardiac cycle. It is directly related to the cardiac output. To calculate the MAP, you need two values - you systolic and diastolic blood pressure.
Using MAP Formulas. 1  1. Take your blood pressure. To be able to calculate your mean arterial pressure, you'll need to know both your diastolic and systolic blood pressures. 2  2. Use the formula MAP = (2(DBP) + SBP)/3. Once you know your diastolic and systolic blood pressures, finding your MAP is easy.