Mean Arterial Pressure (MAP) Calculator
Mean Arterial Pressure (MAP) is the average arterial pressure across a cardiac cycle and is a better reflection of organ-perfusion pressure than systolic or diastolic alone. Enter SBP and DBP to see the MAP and its clinical band.
Enter SBP and DBP within a plausible range (mmHg).
Mean Arterial Pressure
93 mmHg
Normal
Range (mmHg)
< 65 Normal
65–100 Elevated
100–110 High
≥ 110
Pulse pressure (SBP − DBP)
40 mmHg
Typical adult range (30–60 mmHg).
Blood pressure
120 / 80 mmHg
Written as systolic / diastolic.
Reference only — not a clinical diagnosis. See a clinician for persistently abnormal readings.
Formula
MAP = DBP + (SBP − DBP) / 3
- · Formula assumes diastole accounts for ~2/3 and systole ~1/3 of the cardiac cycle at rest.
- · Surviving Sepsis Campaign 2021: target MAP ≥ 65 mmHg for adult septic shock resuscitation.
- · < 65 mmHg: low — organ perfusion may be inadequate.
- · 65–100 mmHg: normal adult range.
- · > 100 mmHg: elevated; ≥ 110 mmHg warrants hypertension review.
- · Pulse pressure (PP = SBP − DBP) is normally 30–60 mmHg; narrow or wide PP have distinct clinical meanings.
- · Reference only — not a substitute for clinical assessment.
Frequently asked
How does MAP differ from a regular blood-pressure reading?
A normal BP reading gives two numbers, SBP and DBP. MAP combines them into a single value that represents the average pressure over the cardiac cycle. In intensive care, anaesthesia and sepsis resuscitation, clinicians look at MAP rather than SBP alone.
Why isn’t MAP just the average of SBP and DBP?
A cardiac cycle is roughly two-thirds diastole and one-third systole. So MAP is not the arithmetic mean (SBP + DBP)/2; instead it’s DBP + (SBP − DBP)/3 — the time-weighted average pressure across the cycle.
What MAP value is considered safe?
For a typical adult, 65–100 mmHg is the normal range. Critical-care guidelines often target MAP ≥ 65 mmHg during resuscitation to maintain brain and kidney perfusion. Targets may be adjusted upward in chronic hypertension or brain injury — discuss with a clinician.
What does pulse pressure tell me?
Pulse pressure = SBP − DBP. For a typical adult it sits around 30–60 mmHg. Narrow PP (< 30) can suggest reduced cardiac output, severe blood loss or aortic stenosis. Wide PP (> 60) is often seen with stiff arteries, ageing or aortic regurgitation.
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