Free tool
Enter a systolic and diastolic blood pressure and get the mean arterial pressure and the pulse pressure, with the working shown and the 60 and 70 to 100 mm Hg benchmarks the NCLEX-RN course teaches. An exam study aid, not for clinical use.
Built for NCLEX-RNSystolic must be higher than diastolic.
Enter a systolic and a diastolic pressure.
Hemodynamic formulas are easy to forget under exam pressure. Encodr keeps MAP, pulse pressure and cardiac output on a spaced-repetition schedule inside the NCLEX-RN deck.
Get started freeMean arterial pressure is the average pressure in the arteries over one heartbeat. The usual estimate is
MAP = diastolic + (1/3 × pulse pressure), where pulse pressure = systolic − diastolic.
The diastolic number counts for more because the heart spends longer in diastole than in systole.
Two benchmarks come up on the exam. A MAP of at least 60 mm Hg is needed to perfuse the vital organs, and a usual adult MAP is about 70 to 100 mm Hg. Pulse pressure is normally about 40 mm Hg, and it narrows when blood volume falls: a pulse pressure under 25 percent of the systolic value counts as narrowed.
Worked examples: a blood pressure of 120/80 has a pulse pressure of 40 and a MAP of 80 + 40/3 = 93.3 mm Hg. A reading of 90/60 gives a pulse pressure of 30 and a MAP of 70 mm Hg. A reading of 80/50 gives a MAP of 60 mm Hg, right at the minimum. A reading of 90/72 has a pulse pressure of 18, which is 20 percent of the systolic value, so it is narrowed. The full explainer is in mean arterial pressure: formula and normal range, and the whole exam course is in the free NCLEX-RN deck.
This tool is a study aid. A single calculated number never replaces assessment of the client, and real care follows the provider's orders and your facility's protocols.
The mean arterial pressure formula, how pulse pressure fits in, the 60 and 70 to 100 mm Hg benchmarks, and worked examples including a narrowed pulse pressure.
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