Mean Arterial Pressure (MAP) Calculator
Calculate MAP from systolic and diastolic blood pressure for quick hemodynamic estimation.
Commas allowed (e.g. 1,200).
Educational use only. Always interpret MAP with overall clinical assessment and local protocols.
How it works
Mean arterial pressure (MAP) is the average arterial pressure across a full cardiac cycle. A commonly used approximation from cuff readings is:
MAP = DBP + (SBP − DBP) ÷ 3
This is an estimate and can be less accurate at very high heart rates, irregular rhythms, or in low-flow states. In critical care, an arterial line provides a measured MAP and is often preferred.
Formula
Worked examples
Example 1: SBP 120 mmHg / DBP 80 mmHg — calculate MAP
Example 2: SBP 90 mmHg / DBP 55 mmHg — calculate MAP
Example 3: SBP 160 mmHg / DBP 100 mmHg — calculate MAP
Clinical safety note: MAP targets vary by patient and condition. In septic shock, many protocols start with MAP ≥65 mmHg, but individual targets may differ (e.g., chronic hypertension). Use validated measurements and follow local protocols.
Related calculators
Frequently asked questions
Clinical reminder: Always follow local protocols and consult medication information sheets. These examples are for calculation practice only.
References & Sources
These sources provide clinical context for MAP targets and blood pressure interpretation.
Sepsis & hemodynamic targets
Surviving Sepsis Campaign Guidelines
GuidelineSociety of Critical Care Medicine
Guideline recommendations for initial MAP targets and hemodynamic resuscitation in sepsis.
Asfar P, et al. High vs low blood-pressure target in septic shock
PubMedN Engl J Med
Trial comparing higher vs lower MAP targets in septic shock.
Physiology & interpretation
Magder S — The meaning of blood pressure
PubMedCritical Care
Physiology-focused explanation of blood pressure and clinical interpretation.
Merck Manual Professional — Blood pressure / perfusion concepts
ReferenceMerck Manual Professional Edition
Clinician reference for BP concepts and perfusion interpretation.