About this calculator
Mean arterial pressure estimates the average pressure in the arteries during one cardiac cycle. It is commonly calculated from systolic and diastolic blood pressure.
MAP = DBP + 1/3 × (SBP − DBP), equivalent to (SBP + 2×DBP) / 3 for typical resting heart rates.
Source-mapped educational formula
Educational estimate only; not a diagnosis, prescription, or treatment plan.
Formula and method
MAP = DBP + 1/3 × (SBP − DBP), which is equivalent to (SBP + 2×DBP) / 3 for typical resting heart rates.
Limitations and when not to rely on this result
- Educational estimate only; not a diagnosis, prescription, or treatment plan.
- Result depends on accurate inputs and may not apply to complex medical situations.
- Use clinician judgment, local guidance, and urgent care pathways when symptoms are severe.
Frequently asked questions
How is MAP calculated? +
MAP is commonly estimated as diastolic pressure plus one-third of pulse pressure.
Is a low MAP dangerous? +
Low MAP can indicate inadequate perfusion in acute illness, but interpretation depends on symptoms and clinical context.
Can I use home blood pressure readings? +
Yes for educational tracking, but abnormal or symptomatic readings should be discussed with a clinician.
Does heart rate affect the formula? +
The simple formula assumes typical resting physiology and is less accurate at very high heart rates.
Is MAP used to diagnose hypertension? +
Hypertension is usually assessed with systolic and diastolic readings over repeated measurements, not MAP alone.