Mean Arterial Pressure Calculator
Estimate mean arterial pressure from blood pressure.
Results update as you type.
This calculator provides estimates based on population research. Results are not medical advice. Consult a qualified healthcare provider before making health or nutrition decisions.
How it works
Mean arterial pressure, or MAP, is the average pressure in the arteries during a single cardiac cycle, and this calculator estimates it from a standard blood pressure reading. You enter the systolic and diastolic values, and it returns the estimated MAP in millimeters of mercury. MAP matters because it better reflects the perfusion pressure driving blood to the organs than either the systolic or diastolic number alone. The heart spends more of each cycle relaxed, in diastole, than contracted, so the formula weights the diastolic pressure about twice as heavily: it takes the diastolic pressure and adds one third of the pulse pressure, which is the gap between systolic and diastolic. For a typical 120 over 80 reading, this gives a MAP of about 93. Clinicians generally consider a MAP of at least 60 to 65 necessary to adequately perfuse vital organs, and MAP is closely watched in critical care and anesthesia. This calculator is an educational estimate using the common formula, not a diagnostic tool. It does not replace medical evaluation, and MAP measured directly with an arterial line can differ. If you have concerns about your blood pressure, consult a healthcare professional. Enter your systolic and diastolic pressures to estimate your mean arterial pressure.
MAP = diastolic + (systolic − diastolic) / 3
Mean arterial pressure estimates the average pressure in your arteries over one heartbeat. Because the heart spends about two-thirds of each cycle in diastole, the formula weights the diastolic pressure more heavily: it adds one third of the pulse pressure, the difference between systolic and diastolic, to the diastolic value.
Source:Clinical physiology (StatPearls)
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter systolic pressure and diastolic pressure.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Mean arterial pressure updates instantly as you type — no button to press.
Frequently asked questions
What is mean arterial pressure?
Mean arterial pressure, or MAP, is the average blood pressure in your arteries over one complete heartbeat. It reflects the pressure that perfuses your organs better than systolic or diastolic pressure alone. MAP is an important measure in medicine, especially in critical care, for assessing whether organs are receiving adequate blood flow.
How is MAP calculated?
Add one third of the pulse pressure to the diastolic pressure. The pulse pressure is systolic minus diastolic. So MAP equals diastolic plus one third of the difference between systolic and diastolic. For 120 over 80, that is 80 plus about 13, giving roughly 93 millimeters of mercury.
Why is diastolic weighted more heavily?
The heart spends roughly two thirds of each cardiac cycle in diastole, the relaxation phase, and only about one third in systole, the contraction phase. Because pressure is at the diastolic level for longer, the average pressure is closer to diastolic, which is why the formula adds only one third of the pulse pressure.
What is a normal MAP?
A MAP in the range of about 70 to 100 millimeters of mercury is generally considered normal, and clinicians usually aim to keep it at or above 60 to 65 to ensure organs are adequately perfused. Values outside this range can indicate problems, but interpretation depends on the individual and clinical context.
Is this a medical diagnosis?
No. This calculator provides an educational estimate using the standard formula and does not diagnose any condition. Directly measured MAP can differ, and blood pressure interpretation requires clinical context. If you are concerned about your blood pressure or have symptoms, consult a qualified healthcare professional rather than relying on this estimate.