Mean Arterial Pressure (MAP) Calculator

Calculate mean arterial pressure (MAP) from systolic and diastolic blood pressure, with pulse pressure and a plain-language read of the result. Example: 120/80 mmHg gives a MAP of 93 mmHg, in the normal range of 70 to 100.

How to use the Mean Arterial Pressure (MAP) Calculator

1. Enter the values in the fields.
2. Press Calculate to see the result with the steps shown.

Formula and method

MAP = (systolic + 2 x diastolic) / 3 = diastolic + one third of pulse pressure. Pulse pressure = systolic – diastolic.

MAP ranges

MAP for common blood pressures

Why MAP matters

Organs are fed by the average pressure over the whole heartbeat, not by the peak. Because the heart spends about twice as long in diastole as in systole, diastolic pressure counts double in the formula. This calculator is for education and is not medical advice. Lab and clinical decisions belong with a qualified clinician who sees the whole picture.

MAP in critical care

Clinicians often target a MAP of at least 65 mmHg in shock, adjusting for each patient. Targets differ with chronic hypertension or brain injury.

Frequently asked questions

What is a normal MAP?

70 to 100 mmHg.

How do you calculate MAP?

Add systolic to twice diastolic and divide by 3.

What MAP is dangerously low?

Below about 60 mmHg for long enough can damage organs; seek urgent care for symptoms.

Is MAP the same as average of systolic and diastolic?

No, diastolic is weighted double.

What is pulse pressure?

Systolic minus diastolic.

Can I use home readings?

Yes, but treat the result as a rough guide.

Sources

• American Heart Association: Understanding blood pressure readings
• Surviving Sepsis Campaign guidelines

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