Map Calculator
Map calculator works out Mean arterial pressure and Pulse pressure from Systolic blood pressure, Diastolic blood pressure and Headline figure. The default figures on this page give mean arterial pressure of 93.3 mmHg; change any entry and the result, the working and the sources update together.
Your figures
Updates as you typeHow this is worked out
3 steps
- Pulse pressure = SBP - DBP = 120 - 80 = 40 mmHg
- One third of the pulse pressure = 40 / 3 = 13.3333 mmHg
- MAP = DBP + PP/3 = 80 + 13.3333 = 93.3333 mmHg
Its 4 worked examples are re-run on every release, last on 15 September 2026. What changed
Sources and references
2 sources
What the map calculator calculates
Computes mean arterial pressure and pulse pressure from a systolic and diastolic blood pressure reading, in mmHg and kPa.
How to use this map calculator
Enter Systolic blood pressure, Diastolic blood pressure and Headline figure. Mean arterial pressure updates as you type, and “Use a worked example” loads checked figures you can adjust. Change one figure at a time to see what drives the result.
How the result is worked out
Open “How this is worked out” beside the result for the step-by-step calculation behind Mean arterial pressure, Pulse pressure and Formula used.
The method follows DeMers D, Wachs D. Physiology, Mean Arterial Pressure. StatPearls, NCBI Bookshelf and BIPM SI Brochure, 9th edition - definition of the torr (101325/760 Pa) used for the mmHg to kPa conversion.
Textbook 120/80 example
With Systolic blood pressure: 120, Diastolic blood pressure: 80, the calculator returns Mean arterial pressure: 93.3333333, Pulse pressure: 40. This example is checked against an independent source in the test suite.
What you can compare
Change one input at a time to see how it affects Mean arterial pressure, Pulse pressure and Formula used. The inputs you can vary are Systolic blood pressure, Diastolic blood pressure and Headline figure.
Understanding Mean arterial pressure, Pulse pressure and Formula used
Educational calculation only. Mean arterial pressure from a cuff reading is an approximation and is not a substitute for clinical assessment or invasive monitoring.
Results are general information, not financial, tax, legal, medical or engineering advice. Check any decision that matters with a qualified professional.
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Frequently asked questions
How do you calculate a MAP in BP?
Computes mean arterial pressure and pulse pressure from a systolic and diastolic blood pressure reading, in mmHg and kPa. Open “How this is worked out” beside the result to see each step for your own figures.
How can you calculate a MAP?
It needs Systolic blood pressure, Diastolic blood pressure and Headline figure. Nothing else is required, and the figures stay in your browser.
What's the formula for a MAP?
Computes mean arterial pressure and pulse pressure from a systolic and diastolic blood pressure reading, in mmHg and kPa. On this page it is computed from Systolic blood pressure, Diastolic blood pressure and Headline figure and shown as Mean arterial pressure, Pulse pressure and Formula used.
What is the MAP for 120/80?
On the figures this page opens with — systolic blood pressure 120 mmHg and diastolic blood pressure 80 mmHg — the mean arterial pressure is 93.3 mmHg. No single number fits everyone: change any figure above and the answer updates as you type, with each step of the arithmetic beside it.
What information do I need for the map calculator?
You need Systolic blood pressure, Diastolic blood pressure and Headline figure. The page opens with default figures that give mean arterial pressure of 93.3 mmHg, so you can see the scale before entering your own.
What does this map calculator show?
It shows Mean arterial pressure, Pulse pressure and Formula used, with the working and any warnings for your entries.