Calculate average blood pressure from up to six systolic/diastolic readings, with mean arterial pressure (MAP), pulse pressure and adult BP category.

One reading gives its MAP. Leave unused pairs blank. Uses US adult categories, not for children or pregnancy; not a diagnosis.

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Mean Arterial Pressure (MAP) Estimate Formula

Blood-pressure averages use the arithmetic mean of systolic values and the arithmetic mean of diastolic values separately. For example, 120/80, 118/78 and 122/82 average to 120/80 mmHg. The traditional MAP approximation is a different quantity:

MAP ≈ (2 × DBP + SBP) / 3

Variables:

  • MAP is the Mean Arterial Pressure estimate (mmHg)
  • DBP is the diastolic blood pressure (mmHg) 
  • SBP is the systolic blood pressure (mmHg) 

To calculate the traditional MAP estimate, multiply diastolic pressure by 2, add systolic pressure, then divide by 3. At 120/80 mmHg this gives approximately 93.3 mmHg. The one-third pulse-pressure rule can be inaccurate and does not replace measured MAP or clinical assessment.

How to Calculate Mean Arterial Pressure (MAP)?

The following steps outline how to calculate the Mean Arterial Pressure (MAP) estimate.

  1. First, determine the diastolic blood pressure (mmHg). 
  2. Next, determine the systolic blood pressure (mmHg). 
  3. Next, gather the formula from above = MAP ≈ (2*DBP + SBP) / 3.
  4. Finally, calculate the MAP estimate.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

diastolic blood pressure (mmHg) = 80

systolic blood pressure (mmHg) = 120

MAP ≈ (2*80 + 120) / 3 = 93.3 mmHg