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About this tool
Calculate pulse pressure and assess cardiovascular health from blood pressure readings.
The Pulse Pressure Calculator subtracts your diastolic reading from your systolic reading to give pulse pressure in mmHg, and also derives mean arterial pressure using the standard MAP = diastolic + (pulse pressure / 3). It then places the result on a five-band reference scale - narrow below 25, low 25-29, normal 30-50, elevated 51-60, and wide above 60 mmHg - with a gauge and a bar showing how much of the systolic figure is diastolic versus pulse pressure. This is general health information for understanding a home reading, not a diagnosis; discuss anything unusual with a clinician.
Open Pulse Pressure Calculator on AltFTool — it loads instantly in your browser.
Type your reading into the Systolic (mmHg) and Diastolic (mmHg) boxes, e.g. 120 and 80.
Press Calculate Pulse Pressure — the button stays disabled until both fields have a value, and readings where diastolic exceeds systolic are refused.
Read the gauge for pulse pressure in mmHg, the MAP figure in the Pressure Breakdown panel, and your highlighted row in the Reference Ranges table (Narrow, Low, Normal, Elevated, Wide).
Every calculation returns both pulse pressure and mean arterial pressure from the same reading, plus MAP as a percentage of systolic.
The full five-row reference table stays on screen with your band highlighted, so you can see how close you are to the next threshold.
Entries where diastolic exceeds systolic, or either value is zero or negative, are refused rather than producing a nonsense negative pulse pressure.
Pulse pressure is systolic minus diastolic. For a reading of 120/80 the pulse pressure is 40 mmHg, which sits in the normal 30-50 band this tool uses.
This calculator treats 30-50 mmHg as normal, 51-60 as elevated, and above 60 mmHg as wide. Below 30 is low and below 25 is narrow. These are general reference bands - individual interpretation depends on age, medication and overall clinical picture, so confirm with a healthcare professional.
A pulse pressure above 60 mmHg is commonly described as wide and is associated with arterial stiffness and isolated systolic hypertension. It is a signal to discuss with a clinician rather than something to act on alone, especially if it appears consistently across several readings.
Using the standard estimate MAP = diastolic + (pulse pressure / 3), which weights diastolic more heavily because the heart spends roughly two thirds of each cycle at rest. For 120/80 that gives about 93.3 mmHg.
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