Mean Arterial Pressure (MAP) Calculator
Calculate your mean arterial pressure from systolic and diastolic blood pressure. Your result estimates the average pressure driving blood through your arteries during one cardiac cycle.
Mean arterial pressure (MAP) is an estimate of the average pressure in your arteries over one heartbeat. Enter the top and bottom numbers from your blood pressure reading to calculate MAP and see general context for the result.
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What Is Mean Arterial Pressure (MAP)?
Mean arterial pressure is the estimated average arterial pressure during one complete cardiac cycle. It is commonly used as an indicator of the pressure available to deliver blood to organs and tissues.
Blood pressure changes continuously as the heart contracts and relaxes. Systolic blood pressure is the higher pressure during contraction, while diastolic blood pressure is the lower pressure between contractions. MAP summarizes the average pressure across the full cycle rather than focusing on only one point in it.
Important: a sustained MAP around 60 mmHg or lower can be clinically concerning because pressure may be inadequate to maintain organ perfusion. A calculator cannot determine the cause or whether treatment is needed.
MAP is commonly estimated with the weighted formula below:
Standard weighted formula
Equivalent pulse-pressure form
Example: 120/80 mmHg
MAP = [120 + (2 × 80)] / 3
MAP = 280 / 3 = 93.3 mmHg
Why Is Diastolic Pressure Weighted Twice?
The formula gives diastolic pressure more weight because the heart normally spends more of each resting cardiac cycle in diastole than in systole. That makes the average pressure across the cycle closer to the diastolic value than a simple arithmetic average would be.
The formula is an approximation. Its accuracy can decrease when heart rate or cardiovascular physiology substantially changes the normal relationship between systole and diastole.
What Is a Normal Mean Arterial Pressure?
About 70–100 mmHg is commonly used as a general resting MAP reference range for adults. It is not a universal diagnostic range, and MAP should be interpreted with the original blood pressure values, symptoms, medical history, and clinical setting.
| MAP (mmHg) | General context | How to interpret it |
|---|---|---|
| < 60 | Low | Sustained pressure at this level may be inadequate for organ perfusion and requires clinical context. |
| 60–69 | Lower range | Significance varies by symptoms, baseline blood pressure, and clinical situation. |
| 70–100 | Common resting reference | Often consistent with adequate perfusion in otherwise stable adults. |
| > 100 | Elevated average pressure | Review the actual systolic and diastolic readings. MAP alone does not diagnose hypertension. |
These are educational reference points, not diagnostic categories.
What Does a Low MAP Mean?
A persistently low MAP can mean that the pressure available to deliver blood to vital organs is inadequate. How concerning it is depends on the number, how long it remains low, symptoms, and the underlying cause.
Low MAP may be monitored closely in conditions involving shock, severe infection, significant blood loss, dehydration, or cardiovascular instability. A home calculator cannot determine which condition, if any, is responsible.
What MAP Is Targeted in Septic Shock?
The 2026 Surviving Sepsis Campaign recommends an initial MAP target of 65 mmHg for adults with septic shock rather than routinely targeting higher pressures. This recommendation applies to critical-care treatment and should not be treated as a universal definition of a normal MAP.
For adults with septic shock who are 65 years or older, the 2026 guideline suggests an initial MAP range of 60–65 mmHg over higher ranges. Targets are managed by clinicians using the patient's complete condition.
What Does a High MAP Mean?
A higher MAP generally reflects higher average pressure in the arterial system, but MAP by itself is not used to diagnose hypertension. For routine blood pressure assessment, the systolic and diastolic readings remain the primary numbers to interpret.
If your calculated MAP is high, review the original blood pressure reading and repeat the measurement correctly if appropriate. Persistent high blood pressure should be discussed with a healthcare professional.
MAP vs. Blood Pressure: What Is the Difference?
Blood pressure gives the systolic and diastolic extremes; MAP estimates the average pressure across the cardiac cycle.
| Measurement | What it represents | Common use |
|---|---|---|
| Systolic BP | Pressure when the heart contracts | Blood pressure classification and cardiovascular risk |
| Diastolic BP | Pressure between heartbeats | Blood pressure classification |
| Pulse pressure | SBP − DBP | Difference between systolic and diastolic pressure |
| MAP | Estimated average arterial pressure | Hemodynamic and organ-perfusion context |
How to Calculate MAP From Your Blood Pressure
You only need the two values from a standard blood pressure reading.
- Enter your systolic pressure, the top number.
- Enter your diastolic pressure, the bottom number.
- Select Calculate MAP.
- Review the estimated MAP together with your original blood pressure reading.
- Use a validated automatic upper-arm blood pressure monitor.
- Use the correct cuff size and place it on bare skin.
- Avoid smoking, caffeinated drinks, and exercise for at least 30 minutes before measuring.
- Empty your bladder and sit quietly for at least 5 minutes.
- Keep your back supported, feet flat, and arm supported at heart level.
- Do not talk or use your phone while the reading is taken.
- Take two readings about one minute apart when appropriate and record the results.
Calculated MAP vs. Arterial-Line MAP
This calculator estimates MAP from cuff blood pressure. In critical-care environments, MAP can instead be measured continuously from an arterial pressure waveform.
- Non-invasive blood pressure cuff
- Systolic and diastolic values entered
- MAP estimated mathematically
- Arterial catheter when clinically indicated
- Continuous arterial pressure waveform
- MAP derived directly from waveform data
Why Clinicians Monitor Mean Arterial Pressure
MAP is useful because adequate organ blood flow depends in part on maintaining enough arterial pressure. It is generally interpreted alongside other vital signs, symptoms, laboratory data, and the clinical situation.
Critical care
MAP helps clinicians assess hemodynamic stability and whether perfusion pressure may be inadequate.
Septic shock
MAP is used to guide vasopressor treatment targets in patients with septic shock.
Surgery and anesthesia
MAP may be monitored closely when anesthesia, blood loss, medications, or cardiovascular changes affect blood pressure.
Cardiovascular monitoring
MAP can add context to systolic pressure, diastolic pressure, heart rate, and other measurements.
Why Use the Calqulate MAP Calculator?
Medical Sources
Key clinical and measurement statements on this page are supported by the following authoritative sources:
- NCBI / StatPearls — Physiology, Mean Arterial Pressure
- Society of Critical Care Medicine — Surviving Sepsis Campaign 2026
- American Heart Association — Home Blood Pressure Monitoring
Last updated: September 2026
Medical Disclaimer
This Mean Arterial Pressure Calculator provides an estimated MAP for educational and informational purposes only. It does not diagnose low blood pressure, hypertension, shock, sepsis, or any other medical condition. Do not use the calculator to start, stop, or change medication, fluids, or other treatment. Clinical decisions require interpretation of your complete blood pressure reading, symptoms, medical history, and other findings by a qualified healthcare professional. If you believe you may be experiencing a medical emergency, seek appropriate emergency medical care.
Put Your MAP in Context
Check your systolic and diastolic values with our Blood Pressure Calculator, or calculate the difference between them with our Pulse Pressure Calculator.
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Frequently Asked Questions
Common questions and answers about this calculator.
How do you calculate mean arterial pressure?
Mean arterial pressure is commonly estimated with MAP = [SBP + (2 × DBP)] / 3. For a blood pressure of 120/80 mmHg, MAP = [120 + (2 × 80)] / 3 = about 93.3 mmHg.
What is a normal mean arterial pressure range?
A MAP of about 70 to 100 mmHg is commonly used as a general resting reference range in adults. It is not a universal diagnostic range, and the meaning of a result depends on the original systolic and diastolic readings, symptoms, and clinical situation.
What is the mean arterial pressure formula?
The common estimated MAP formula is MAP = [SBP + (2 × DBP)] / 3. An equivalent form is MAP = DBP + 1/3(SBP - DBP). Both use systolic and diastolic blood pressure to estimate average arterial pressure during the cardiac cycle.
How do I calculate MAP from blood pressure readings?
Enter the systolic top number and diastolic bottom number from your blood pressure reading. Multiply the diastolic pressure by 2, add the systolic pressure, and divide the total by 3.
Why is diastolic pressure multiplied by 2 in the MAP calculation?
At a normal resting heart rate, the heart generally spends more of the cardiac cycle in diastole than in systole. The standard formula therefore gives diastolic pressure greater weight when estimating average pressure across the cycle.
What does a MAP blood pressure reading tell you?
MAP estimates the average arterial pressure across one cardiac cycle. Clinicians use it as one indicator of the pressure available to perfuse organs, especially in hemodynamic and critical-care monitoring.
How is mean arterial pressure calculated in hospitals vs at home?
At home, MAP is usually estimated from cuff-based systolic and diastolic readings. In intensive-care and operating-room settings, MAP can also be measured continuously from an invasive arterial pressure waveform.
What is the target MAP for septic shock?
The 2026 Surviving Sepsis Campaign recommends an initial MAP target of 65 mmHg for adults with septic shock rather than routinely targeting higher pressures. This is a critical-care treatment target, not a universal definition of normal MAP.
Is a MAP of 65 normal?
A MAP of 65 mmHg is below the commonly cited resting reference range of about 70 to 100 mmHg, but context matters. In adults with septic shock, 65 mmHg is used as an initial treatment target under current Surviving Sepsis Campaign guidance.
What MAP is too low?
A MAP around 60 mmHg or lower can be concerning when sustained because organ perfusion may become inadequate. A home result should be interpreted with the actual blood pressure reading, symptoms, and medical context rather than MAP alone.
Tool Information
August 2026
Dr. Jaydeep Sanghani
Meet Akabari
Dr. Jaydeep Sanghani
MBBS, MD, DNB(Anaesth.), PDCC(CCM), DrNB(CCM)
AIIMS Bhubaneswar · AIIMS Rishikesh
Critical care specialist and anesthesiologist with advanced training from AIIMS. Reviews health calculators at Calqulate to ensure medical accuracy and evidence-based standards.
About the authors
