General and clinical
Mean arterial pressure (MAP)
Mean arterial pressure is the average pressure driving blood into the tissues over one cardiac cycle. It is the number resuscitation targets are written against, rather than the systolic.
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This calculator is provided for reference and education. It does not replace clinical assessment, examination, current guidelines, local protocol, or professional judgment. Verify every result before acting on it. Nirogix accepts no liability for clinical decisions made using this tool.
The formula
- MAP = diastolic + (systolic − diastolic) ÷ 3
Worked example
120/80 → 80 + (120 − 80) ÷ 3 = 80 + 13.3 = 93 mmHg
When to use it
- Assessing perfusion in shock or sepsis
- Titrating vasopressors against a written target
And when not to
- The ⅓ approximation assumes a normal heart rate. At high rates diastole shortens and the estimate drifts upward of the true mean.
- An arterial line measures MAP directly. Where one is in place, use it rather than this.
References
- Surviving Sepsis Campaign: international guidelines — Evans L et al., Critical Care Medicine, 2021
Last reviewed 07/09/2026.
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