MAP Blood Pressure Calculator
Enter systolic and diastolic readings to estimate mean arterial pressure, see the published MAP reference band, calculate pulse pressure and identify the AHA category for the raw reading.
Result
—
Mean arterial pressure
— mmHg
- Pulse pressure
- —
- MAP reference band
- —
- AHA category
- —
Reference only. A single reading is not enough, and MAP from a cuff is an estimate. View the blood pressure chart.
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How a MAP blood pressure calculator works
A MAP blood pressure calculator estimates mean arterial pressure from systolic and diastolic readings. The standard estimate also gives pulse pressure, which is systolic pressure minus diastolic pressure; normal pulse pressure is roughly 40 mmHg, while values over about 60 or under about 25 are clinically noteworthy.
The /3 appears because diastole occupies roughly two thirds of the cardiac cycle at a normal heart rate, so diastolic pressure is weighted double. That approximation degrades at high heart rates, so cuff-derived MAP is an estimate rather than a measurement. A single reading is not enough to diagnose a condition.
A MAP below 60 mmHg is widely used as a threshold at which organ perfusion may be inadequate, and at least 65 mmHg is a target commonly used in critical care. Roughly 70-100 mmHg is the commonly cited normal adult range; these are published reference points, not a verdict about an individual. See the sibling [blood pressure chart](/tools/blood-pressure-chart) for the AHA categories.
MAP = DBP + (SBP - DBP) / 3 = (SBP + 2 × DBP) / 3; pulse pressure = SBP - DBP This tool reports a computed value and published reference bands. It does not diagnose, recommend treatment or medication, and a cuff-derived MAP is an estimate.
American Heart Association: Understanding blood pressure readings ↗
MAP blood pressure calculator FAQ
What is the MAP formula?
MAP = DBP + (SBP - DBP) / 3, which is algebraically the same as MAP = (SBP + 2 × DBP) / 3.
Why is diastolic pressure weighted twice?
At a normal heart rate, diastole occupies roughly two thirds of the cardiac cycle. The formula uses that timing as an approximation, and it becomes less reliable at high heart rates.
What does pulse pressure mean?
Pulse pressure is systolic pressure minus diastolic pressure. Normal pulse pressure is roughly 40 mmHg; a value over about 60 or under about 25 is clinically noteworthy.
What does the MAP reference band mean?
It compares the computed result with published reference points: roughly 70-100 mmHg is a commonly cited normal adult range, and below 60 mmHg is widely used as a threshold at which organ perfusion may be inadequate. It is not a diagnosis.
Can one reading diagnose high blood pressure?
No. A single reading is not enough. The AHA category shown here describes the raw systolic and diastolic values; use the blood pressure chart for category details and discuss concerns with a qualified healthcare professional.