Mean Arterial Pressure (MAP) Calculator
Mean Arterial Pressure (MAP) is the average pressure in the arteries throughout one cardiac cycle. Clinicians use it to assess whether organs are receiving adequate blood flow — normal MAP is 70–100 mmHg, and values below 60 mmHg may signal dangerously low perfusion.
mmHg
mmHg
Normal MAP range is 70–100 mmHg. Values below 60 mmHg may indicate inadequate organ perfusion.
- 1
Pulse pressure
SBP − DBP = 120 − 80 = 40 - 2
PP ÷ 3
40 ÷ 3 = 13.3333The heart spends roughly ⅔ of the cycle in diastole, so MAP is weighted toward DBP. - 3
Mean Arterial Pressure
DBP + PP÷3 = 80 + 13.3333 = 93.3
How does this calculator work?
MAP = DBP + (SBP − DBP) / 3. Enter your systolic and diastolic blood pressure readings to get the mean arterial pressure, pulse pressure and a clinical range indicator. Normal MAP is 70–100 mmHg; below 60 mmHg risks inadequate organ perfusion.
Formula
How this is calculated
The heart spends roughly one-third of each cardiac cycle in systole (contracting) and two-thirds in diastole (relaxing). Because pressure is higher for less of the cycle, the true time-averaged mean arterial pressure is not the simple midpoint of SBP and DBP but is skewed toward diastole. The formula MAP = DBP + (SBP − DBP) / 3 captures this weighting, which is algebraically identical to (SBP + 2 × DBP) / 3.
Clinically, MAP is preferred over either SBP or DBP alone because it better reflects the steady driving force for tissue perfusion. A MAP below 60–65 mmHg is a common threshold for concern in intensive care: at this level kidneys, brain and heart may not receive sufficient oxygen. Hypertensive crisis is generally defined as MAP above 150 mmHg or SBP above 180 mmHg.
This calculator provides an educational estimate using the standard formula. The result is not a substitute for clinical measurement or physician assessment. Invasive arterial-line MAP (which integrates the actual waveform) may differ slightly from the formula-derived value used here.
Frequently asked questions
A normal MAP is generally 70–100 mmHg. Below 60 mmHg is considered too low for adequate perfusion of vital organs. Above 100 mmHg is elevated and may reflect hypertension.
Because the heart spends more time in diastole than systole. Diastole lasts roughly twice as long, so the weighted average pressure is MAP = DBP + (SBP − DBP) / 3, biased toward DBP.
Standard cuff readings report SBP/DBP (e.g. 120/80). MAP is the single time-averaged number that best describes the perfusion driving force for organs and is widely used in critical-care monitoring.
TG we-Calculate Editorial Team. (2026). Mean Arterial Pressure (MAP) Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/mean-arterial-pressure-calculator
TG we-Calculate Editorial Team. "Mean Arterial Pressure (MAP) Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/mean-arterial-pressure-calculator.
TG we-Calculate Editorial Team, "Mean Arterial Pressure (MAP) Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/mean-arterial-pressure-calculator
@misc{wecalculate_mean_arterial_pressure_calculator, title = {Mean Arterial Pressure (MAP) Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/mean-arterial-pressure-calculator}}, year = {2026}, note = {TG we-Calculate} }
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