About the Mean Arterial Pressure Calculator
Mean arterial pressure, MAP, is the average pressure in the arteries during one heartbeat. Doctors use it to judge whether organs are getting enough blood. It is worked out from the top number (systolic) and the bottom number (diastolic) of a blood pressure reading. This calculator also gives the pulse pressure, which is the difference between the two numbers. Type the systolic and the diastolic pressure and the mean arterial pressure appears at once, with a few related figures underneath, and you can copy the result with one tap. The sums run in your browser, so nothing you enter is uploaded.
Updated October 2026
How to use the Mean Arterial Pressure Calculator
- 1Enter the systolic and the diastolic pressure.
- 2Pick the units or options from the menus if the mean arterial pressure tool offers them.
- 3Read the mean arterial pressure in the large result box.
- 4Look at the extra rows for related figures.
- 5Press Copy result to keep the answer.
When you need the mean arterial pressure
Clinicians use MAP in intensive care and emergency care, where a MAP below about 65 is a warning sign. Students use the calculation in physiology courses. Home users sometimes check it alongside their blood pressure log.
The weight on diastolic pressure comes from the fact that the heart spends about two thirds of each beat relaxed. That is why the formula adds only a third of the difference to the diastolic value.
How the mean arterial pressure is worked out
MAP = diastolic + (systolic − diastolic) ÷ 3. Pulse pressure = systolic − diastolic. A reading of 120 over 80 gives a MAP of 80 + 40 ÷ 3 = 93.3 mmHg and a pulse pressure of 40 mmHg, within the usual ranges. A reading of 90 over 55 gives a MAP of 66.7, below the usual 70 to 100 range.
Every answer on this page comes from that one rule, so you can check any result by hand with a calculator. The figures shown underneath, such as other units, are conversions of the same answer.
- MAP and pulse pressure
- Range note
- Quick two-number input
Mistakes to avoid with mean arterial pressure
This is not a diagnostic tool and does not replace advice from a doctor. A single reading can vary through the day, and a MAP in the usual range does not mean the blood pressure is healthy. See a professional for any concern.
On phone and computer
On a phone, type into the boxes one after another and read the mean arterial pressure underneath; Copy result puts it on the clipboard for a message or a note. On a computer the inputs sit on the left and the answer on the right, so you can change one figure and watch the mean arterial pressure move. The mean arterial pressure calculator works the same on both. MAP is one number from a blood pressure reading, so look at others. Use the Blood Pressure Category Checker for the reading itself, the Target Heart Rate Calculator for exercise zones, and the BMI Calculator for a general weight check.
Features
- Not a diagnosis
- Readings vary
- MAP below 65 is a warning sign
- Clear messages when the mean arterial pressure inputs make no sense
- Copy the result with one tap
- Private: nothing is uploaded
Frequently asked questions
How do I calculate mean arterial pressure?
MAP = diastolic + (systolic − diastolic) ÷ 3. Pulse pressure = systolic − diastolic. A reading of 120 over 80 gives a MAP of 80 + 40 ÷ 3 = 93.3 mmHg and a pulse pressure of 40 mmHg, within the usual ranges. A reading of 90 over 55 gives a MAP of 66.7, below the usual 70 to 100 range.
What is the formula for mean arterial pressure?
MAP = diastolic + (systolic − diastolic) ÷ 3. Pulse pressure = systolic − diastolic. The mean arterial pressure calculator applies it exactly and rounds only the displayed answer to six significant figures.
What is a normal MAP?
Usually 70 to 100 mmHg. A value of at least about 60 to 65 is needed to supply the organs.
What is pulse pressure?
The gap between systolic and diastolic pressure. A typical value is around 40 mmHg.
Why is it not a simple average?
The heart spends more time in diastole, so the mean sits closer to the diastolic value.
Is this mean arterial pressure calculator free and private?
Yes. It is free, needs no account and runs in your browser, so the numbers you type are not uploaded or stored.