What is Mean Arterial Pressure (MAP)?

MAP is the average blood pressure during a single cardiac cycle. It represents the perfusion pressure seen by organs in the body. A MAP of at least 60-65 mmHg is necessary to perfuse vital organs like the brain, heart, and kidneys.

Why is MAP important in clinical practice?

MAP is critical for tissue perfusion. Unlike systolic BP which reflects peak pressure, MAP indicates the sustained pressure driving blood through organs. In ICU settings, maintaining adequate MAP (typically >65 mmHg) is a primary goal in managing shock.

What is Pulse Pressure and what does it indicate?

Pulse Pressure is the difference between systolic and diastolic pressure. Normal range is 30-50 mmHg. Widened PP (>60) may indicate aortic regurgitation, hyperthyroidism, or arteriosclerosis. Narrowed PP (<25) may indicate heart failure, aortic stenosis, or hypovolemia.

What is Shock Index and when is it useful?

Shock Index = Heart Rate / Systolic BP. Normal is 0.5-0.7. A value >1.0 suggests significant hemodynamic compromise and correlates with need for blood transfusion, ICU admission, and increased mortality in trauma patients.

How is MAP calculated?

MAP = DBP + (1/3 × Pulse Pressure) = DBP + (1/3 × (SBP - DBP)), or equivalently: MAP = (SBP + 2×DBP) / 3. This formula accounts for the fact that diastole lasts about twice as long as systole at normal heart rates.

MAP Calculator

Q: What is Shock Index and when is it useful?

Shock Index = Heart Rate / Systolic BP. Normal is 0.5-0.7. A value >1.0 suggests significant hemodynamic compromise and correlates with need for blood transfusion, ICU admission, and increased mortality in trauma patients.

Calculate Mean Arterial Pressure for organ perfusion assessment. Also includes Pulse Pressure and Shock Index.

Vital Signs

Systolic Blood Pressure

mmHg

The top number in a blood pressure reading. Represents the peak pressure when the heart contracts (systole). Normal adult range: 90-120 mmHg.

Diastolic Blood Pressure

mmHg

The bottom number in a blood pressure reading. Represents the resting pressure when the heart relaxes (diastole). Normal adult range: 60-80 mmHg.

Heart Rate (for Shock Index)

bpm

Beats per minute. Used to calculate Shock Index (HR/SBP). Normal resting heart rate: 60-100 bpm.

Mean Arterial Pressure

— mmHg

Enter blood pressure values

Pulse Pressure

— mmHg

Normal: 30-50 mmHg | Normal

Shock Index

—

Clinical Reference Ranges

MAP

• Normal: 70-100 mmHg
• Minimum for perfusion: 60-65
• ICU target: >65 mmHg

Pulse Pressure

• Normal: 30-50 mmHg
• Widened: >60 (AR, sepsis)
• Narrowed: <25 (shock)

Shock Index

• Normal: 0.5-0.7
• Elevated: 0.7-1.0
• Critical: >1.0 (shock)

The Formulas

MAP

(SBP + 2×DBP) / 3

= (120 + 2×80) / 3 =

Pulse Pressure

SBP - DBP

= 120 - 80 =

Shock Index

HR / SBP

= 72 / 120 =

Frequently Asked Questions

How to Use

About the MAP Calculator

What it calculates

This map calculator applies a validated clinical scoring method used in healthcare settings. Mean Arterial Pressure for organ perfusion.

When to use it

Use as a clinical decision support aid alongside professional judgment — not as a standalone diagnosis.

Example

Adjust the inputs above to model your specific scenario with the MAP Calculator.

Explore More

MAP Calculator

Vital Signs

— mmHg

Clinical Reference Ranges

The Formulas

About the MAP Calculator

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