Mean Arterial Pressure Calculator (MAP)
MAP and pulse pressure from systolic and diastolic blood pressure.
MAP = diastolic + (systolic − diastolic) ÷ 3. For a blood pressure of 120/80, MAP = 80 + 40 ÷ 3 = 93 mmHg. Normal MAP is about 70–100 mmHg.
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How to use it
- Enter systolic and diastolic blood pressure in mmHg.
- Read MAP, pulse pressure and the interpretation.
What you enter
- Systolic BP
- Diastolic BP
What you get
- Mean arterial pressure
- Pulse pressure
- Interpretation
Formula
MAP = DBP + (SBP − DBP) ÷ 3 | Pulse pressure = SBP − DBP
Worked example
Input: BP 120/80 mmHg
Result: MAP 93 mmHg, pulse pressure 40 mmHg
Normal perfusion pressure.
Questions
What is a normal mean arterial pressure?
About 70–100 mmHg. Below 60–65 mmHg, organs such as the kidneys and brain may not get enough blood.
Why is MAP not just the average of systolic and diastolic?
At normal heart rates the heart spends about two-thirds of each beat in diastole, so MAP is weighted toward diastolic pressure.
What MAP is the target in sepsis?
Surviving Sepsis Campaign guidelines recommend an initial target of 65 mmHg in septic shock needing vasopressors.
What is pulse pressure?
Systolic minus diastolic. Normal is about 40 mmHg; a wide pulse pressure over 60 mmHg in older adults suggests stiff arteries.
Limitations
- The one-third formula is less accurate at fast heart rates; arterial lines measure MAP directly.
References
Related reading
- Veterinary Blood Pressure Measurement: Methods and Interpretation
- Blood Pressure Monitoring During Anesthesia: Methods and Interpretation
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