The formula
How to calculate pulse pressure
Pulse pressure is the difference between the systolic and diastolic readings — the pressure swing each heartbeat produces. It reflects how stiff the large arteries are and how much blood the heart ejects per beat.
The pulse pressure fraction normalises the figure against mean arterial pressure, which makes it comparable between people with very different baseline pressures.
What to enter:
- Systolic pressure (mmHg)
- Diastolic pressure (mmHg)
The result updates on every keystroke. The URL updates too, which makes the filled-in version easy to bookmark or send to someone else.
None of the fields above need specialist equipment to fill in — the inputs are the kind of measurements that can be taken at home with a tape measure or scale, which is exactly why this style of calculation is widely used as a first, approximate check rather than a diagnostic one.
Why pulse pressure matters
People usually look up a pulse pressure calculation to put a number on something they can already sense but cannot quite quantify — how their fitness compares with a reference range, how a measurement is trending, or what a change actually means. A calculator turns that vague sense into a concrete figure, which is useful even though the figure itself is only ever an estimate.
It is most useful tracked over time rather than read once — a single reading tells you where you are today, while the same calculation repeated weeks or months apart, using the same method each time, shows the direction things are actually moving in.
A single number like this is most useful placed in context rather than read in isolation. Reference ranges exist because bodies vary considerably and still count as healthy across a wide spread of values, so a result sitting outside a commonly quoted range is a prompt to look more closely rather than a verdict on its own. The same figure, tracked consistently over time, tends to say more than any single reading ever will.
A calculator like this one is frequently used to prepare a specific number for an upcoming appointment, so that a description like "I think it has changed" can be replaced with an actual figure and a date it was measured on. Clinicians and trainers generally find a concrete number, however approximate, more useful to work from than a general impression.
Worked example
Work through the defaults on this page:
- Systolic pressure: 130 mmHg
- Diastolic pressure: 78 mmHg
That gives:
- Pulse pressure: 52 mmHg
- Pulse pressure fraction: 0.55
- Mean arterial pressure: 95.33 mmHg
Those starting figures exist only to show the calculation working, not as a target or a reference value to compare yourself against — replace them with your own measurements in the calculator above and the same formula applies exactly as shown.
Reading the result
Around 40 mmHg is typical. Consistently above 60 mmHg suggests arterial stiffening and is an independent cardiovascular risk marker in older adults. Below 25 mmHg can indicate low cardiac output.
Where this goes wrong. Pulse pressure widens naturally with age as arteries lose elasticity, so the figure needs interpreting against age rather than against a single threshold. Discuss any concerns with a clinician; this page is general information only.
As with any general-purpose formula, the result here is an estimate derived from population averages, not a measurement specific to you — a reasonable starting point for a conversation with a qualified professional, not a replacement for one. Nothing on this page is medical advice.
Most commonly arterial stiffening with age. Other causes include aortic valve regurgitation, anaemia, hyperthyroidism and, briefly, exercise.
It adds information rather than replacing it. In people over 60 it has been shown to predict cardiovascular events at least as well as systolic pressure alone.
The headline figure is pulse pressure. With 130 mmHg systolic pressure and 78 mmHg diastolic pressure, that comes to 52 mmHg. Change any field and the figure moves with it.
It uses a published formula applied exactly as defined, so the arithmetic itself is precise — but the formula is a population-level estimate, and individual results can vary from it for reasons the formula has no way to account for. Treat the output as a reasonable estimate rather than a measured or diagnostic value.
For most people, yes — a single reading is a snapshot, while the same measurement repeated consistently over weeks or months shows a trend, which is generally more informative than any one figure taken in isolation.
Small differences between calculators usually come down to which published formula or reference dataset each one uses — several equations in this area exist in more than one accepted version. This page states the specific formula used in the section above, so it is possible to check directly whether another source is using the same one.