Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Calculate mean arterial pressure (MAP) from systolic and diastolic readings.
93.3 mmHg
Mean Arterial Pressure (MAP) is the average pressure in a person's arteries during one cardiac cycle, a standard clinical metric. A normal MAP is commonly cited as 70-100 mmHg; organ perfusion generally requires at least around 60 mmHg.
Enter your systolic and diastolic blood pressure readings. MAP appears instantly.
MAP = Diastolic + (1/3 × (Systolic - Diastolic))
This weighting reflects that diastole (the resting phase) takes up roughly twice as much of the cardiac cycle as systole.
This tool performs simple arithmetic on readings you provide -- it does not measure blood pressure itself, and it's not a diagnostic tool. Consult a healthcare provider about any blood pressure concerns, especially in clinical/critical-care contexts where MAP is actively monitored.
For a reading of 120 over 80, the pulse-related gap is 40, one third of that is 13.33, and adding it to the diastolic value gives a MAP of about 93.3 mmHg, shown to one decimal place. For 100 over 60, the gap is 40 again, so MAP is 60 + 13.33 = 73.3. For 90 over 50 the gap is 40 and MAP is 63.3. Compare that with a simple average: for 120 over 80 the plain average is 100, noticeably higher than 93.3, which illustrates how the formula pulls the result toward the diastolic number.
MAP = Diastolic + (Systolic - Diastolic) / 3. Example: 130 / 85 gives 85 + 15 = 100.0 mmHg
The page states a commonly cited normal range of 70 to 100 mmHg and mentions that organs generally need about 60 mmHg or more for adequate blood flow. Values near or below the lower end matter more clinically than a modest rise above the upper end, which is why hospitals monitor MAP in critically ill patients. However, a home reading is not the same as a monitored clinical setting. If your result is close to or below 60, and especially if you feel faint, confused, cold and clammy, or unusually weak, seek medical attention rather than relying on this calculator.
The formula assumes that a heartbeat spends about one third of its time in systole and two thirds in diastole. That ratio holds reasonably well at a normal resting heart rate. At fast heart rates diastole shortens, so the estimate may drift from the true average pressure, and in unusual conditions other formulas or direct invasive measurement are used. It is an estimate calculated from two numbers, not a measured mean pressure. The tool rounds the display to one decimal place, which implies more precision than blood pressure cuffs actually provide, since cuffs themselves are usually accurate only to a few mmHg.
MAP is helpful when you want a single number that reflects average pressure over the heartbeat, for example when a clinician or study mentions it, or when you are learning how it differs from pulse pressure. It does not diagnose high or low blood pressure. This page is educational and not medical advice; discuss your readings and any medicine with a healthcare provider.
Because diastole (the resting/filling phase) lasts roughly twice as long as systole (the contraction phase) within each heartbeat, so the formula weights diastolic pressure more heavily to reflect that time distribution.
It's commonly monitored in critical-care settings as an indicator of organ perfusion adequacy -- a MAP below roughly 60 mmHg can indicate insufficient blood flow to vital organs.
No -- pulse pressure is systolic minus diastolic (see the Pulse Pressure Calculator); MAP is a differently weighted average of the two.
The formula gives diastolic pressure two thirds of the weight, because the heart spends more of each cycle in the resting phase, so the result lands nearer to the lower number.
Not with a normal reading. Since diastolic is weighted more heavily, MAP is always below the plain midpoint whenever systolic is above diastolic.
It falls inside the commonly cited 70 to 100 mmHg range, but only a healthcare provider can say what is appropriate for you based on your full history.
No. It uses only systolic and diastolic pressure. Heart rate is not an input.
Reference: Centers for Disease Control and Prevention