Free tool
MAP calculator.
Mean arterial pressure from any cuff reading. The number that actually drives perfusion.
Mean arterial pressure
93 mmHg
Adequate
Within normal range for organ perfusion.
Formula
MAP ≈ (2 × DBP + SBP) / 3
Diastolic is weighted 2× because roughly two-thirds of the cardiac cycle is spent in diastole. The full formula (DBP + 1/3 pulse pressure) gives the same result.
Clinical targets
- ≥ 65 mmHg — general perfusion floor for sepsis / shock.
- ≥ 80–90 mmHg — TBI / cerebral perfusion protection.
- < 65 mmHg — start fluids, consider pressors per protocol.
Frequently asked
- What is the MAP formula?
- MAP ≈ (2 × diastolic + systolic) / 3. It weights diastolic more heavily because the heart spends about two-thirds of the cardiac cycle in diastole.
- What is a normal MAP?
- 65–100 mmHg is considered adequate for organ perfusion in most adults. Below 65 mmHg, end-organ perfusion (kidneys, brain) starts to fail.
- Why does MAP matter more than systolic BP?
- MAP reflects the average pressure driving blood into tissues. A patient with SBP 100 and DBP 40 has worse perfusion than one at 100/70 despite identical systolics.
- What MAP is the sepsis / shock target?
- Surviving Sepsis guidelines target MAP ≥ 65 mmHg. In head injury, many systems target MAP ≥ 80–90 mmHg to protect cerebral perfusion.
For educational and exam-preparation use only. Not medical advice.