What is a normal mean arterial pressure?

A normal MAP is generally between 70 and 100 mmHg. A MAP of at least 60 mmHg is considered the minimum required to perfuse the brain, heart, and kidneys. Most clinical guidelines target a MAP ≥ 65 mmHg in critically ill patients.

Why is MAP not just the average of systolic and diastolic?

The heart spends about two-thirds of each cardiac cycle in diastole and one-third in systole. Because diastole lasts longer, MAP is weighted toward diastolic pressure: MAP = DBP + (SBP − DBP) / 3, rather than a simple (SBP + DBP) / 2.

What does a low MAP indicate?

A MAP below 60–65 mmHg suggests insufficient organ perfusion pressure and may indicate hypotension, shock, or severe dehydration. Medical evaluation is advised immediately if you consistently measure a low MAP.

Can I use this calculator for clinical decisions?

This tool is for educational and informational purposes only. Always consult a qualified healthcare professional for diagnosis, treatment, or clinical management decisions.

What units should I use?

Blood pressure is measured in millimeters of mercury (mmHg). Enter only numeric values — the calculator expects standard sphygmomanometer readings.

Mean Arterial Pressure Calculator

Enter systolic and diastolic blood pressure values to calculate your Mean Arterial Pressure (MAP) with a clinical interpretation.

Blood Pressure Inputs

Systolic Pressure (SBP)

mmHg

The higher number from your blood pressure reading.

Diastolic Pressure (DBP)

mmHg

The lower number from your blood pressure reading.

Formula Used

MAP = DBP + (SBP − DBP) / 3

Weighted average accounting for diastole duration.

Mean Arterial Pressure

mmHg

Low Normal High

40 70 100 110+

Clinical Interpretation

Enter values to see interpretation

Provide both systolic and diastolic pressure above, then click Calculate MAP.

MAP Clinical Reference Ranges

Range (mmHg)	Classification	Clinical Significance
< 60	Critically Low	Inadequate organ perfusion; emergency evaluation required.
60 – 69	Low / Borderline	Marginal perfusion; may cause symptoms such as dizziness.
70 – 100	Normal	Adequate tissue perfusion for most healthy adults.
101 – 110	Elevated	Suggests pre-hypertension; lifestyle review recommended.
> 110	High	Hypertension; consult a healthcare provider for management.

This table is for informational purposes only and does not constitute medical advice.

Summary

Mean Arterial Pressure (MAP) is a weighted average of blood pressure throughout one cardiac cycle, reflecting the true perfusion pressure driving blood to vital organs. MAP is calculated as diastolic pressure plus one-third of the pulse pressure (systolic minus diastolic). Clinicians use MAP to assess organ perfusion, monitor critically ill patients, and guide treatment decisions.

How it works

Enter your systolic blood pressure (the top number) in mmHg.
Enter your diastolic blood pressure (the bottom number) in mmHg.
The calculator applies the clinical formula: MAP = DBP + (1/3) × (SBP − DBP).
Your MAP result is displayed instantly with a color-coded clinical range indicator.
Use the interpretation panel to understand what the value means for organ perfusion.

Use cases

Quickly estimate MAP from a standard blood pressure reading.
Screen for hypotension (MAP < 70 mmHg) that may indicate inadequate perfusion.
Monitor hypertension management progress over time.
Educate patients on the clinical significance of blood pressure readings.
Support clinical decision-making in critical care and emergency settings.
Calculate MAP for research, nursing exams, or medical school study.

Frequently Asked Questions

Last updated: 2026-09-30 · Reviewed by Nham Vu

Mean Arterial Pressure Calculator

Use the Mean Arterial Pressure Calculator

Blood Pressure Inputs

MAP Clinical Reference Ranges

Summary

How it works

Use cases

Frequently Asked Questions