Mean Arterial Pressure (MAP) Calculator - From Systolic and Diastolic
Mean Arterial Pressure Calculator
Turn a blood pressure reading into the average pressure that drives blood flow
The Average Pressure
MAP is the average pressure in your arteries over one heartbeat, and a better guide to blood flow to the organs than either number alone.
Pulse Pressure
The gap between systolic and diastolic is shown too, since a very wide or narrow gap can matter to clinicians.
Reference Range
See whether your MAP is below 60, low, in the usual 70 to 100 mmHg range, or above it.
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How MAP Is Calculated
The heart spends about two-thirds of each cycle relaxed (diastole) and one-third contracting (systole), so MAP is weighted the same way: MAP = diastolic + (systolic − diastolic) ÷ 3. For a reading of 120/80 that is 80 + 40 ÷ 3 = 93.3 mmHg. A MAP of about 60 mmHg or more is generally needed to keep the organs supplied with blood, and a range of 70 to 100 mmHg is usually considered normal.
This is general information, not a diagnosis. Blood pressure varies through the day, and one reading does not tell you much. Targets differ for people with certain conditions and for those in hospital care. If you have symptoms such as dizziness, chest pain or fainting, or you are worried about a reading, contact a doctor or emergency services rather than relying on this calculator.
Key Takeaways
- Standard formula: Uses the widely taught diastolic-plus-one-third-pulse-pressure equation.
- Sanity checks: Rejects a systolic value at or below the diastolic one and implausible readings.
- Information only: Not a diagnosis or medical advice.