Calculators

Mean Arterial Pressure

Mean Arterial Pressure is part of Toolspire and is ready as soon as this page loads. Diastole is counted twice because the heart spends longer there. This is the usual bedside estimate, not a reading from an arterial line.

Runs in this tabFreeNo account

Systolic (mmHg)Diastolic (mmHg)

Result

93.33 mmHg

(120 + 2 × 80) / 3. An estimate, not a monitor.

An arithmetic estimate from two numbers you type. Not a diagnosis and not a treatment target.

On this page

What you can do here

The 2 is visible

120 + 2×80 is 280, and 280/3 is the result.

mmHg in and out

The page does not convert to kPa.

Not a monitor

An arterial line measures a mean. This page estimates one from two cuff numbers.

The sequence

How to use the Mean Arterial Pressure

1
Type the two cuff numbers
120 and 80 are the sample.
2
Read 93.33
That is 280 divided by 3.
3
Do not treat a single number as a plan
What to do about a pressure is not this division.

Worth knowing

Mean Arterial Pressure on Toolspire: MAP ≈ (systolic + 2 × diastolic) / 3.
(120 + 160) / 3 = 93.33 mmHg.
The diastolic term is doubled because diastole lasts longer than systole in this estimate.
A diastolic pressure above the systolic is rejected. That pair is not a readable pressure.

Why diastole is doubled

The usual estimate of mean arterial pressure weights the diastolic number twice and the systolic number once, then divides by three. On 120/80 that is (120 + 160) / 3 = 93.33. The weighting is a shortcut for the extra time the heart spends in diastole. It is not the mean a monitor computes from the pulse wave. The page also refuses a diastolic number higher than the systolic, because that pair is not a blood-pressure reading.

FAQ

Questions about Mean Arterial Pressure

Where does Mean Arterial Pressure run?

Mean Arterial Pressure runs in this tab on Toolspire. What you type or drop in is not sent to us and is not stored on a server.

What is the MAP of 120/80?

93.33 mmHg.

Why is 80 doubled?

The estimate counts diastole twice and systole once, then divides by three.

What if the bottom number is higher?

The page rejects it. Diastole should not exceed systole in a cuff reading.

Is this a diagnosis?

No. It is the arithmetic of the two numbers.

Keep going

Body Surface AreaNewBody Surface Area on Toolspire. Estimate body surface area with the Mosteller formula, the square root of height times weight over 3600.Calculators Target Heart Rate CalculatorNewEstimate a maximum heart rate as 220 minus age, then list the 50, 60, 70 and 80 percent training zones. The maths stays on your device.Calculators BMI CalculatorNewBMI Calculator on Toolspire: Enter height in feet or cm and weight in kg or lb to see your BMI, WHO or Asian (Indian) category and healthy weight range.Calculators EMI CalculatorNewEMI Calculator on Toolspire. Calculate your loan EMI, total interest and full repayment schedule instantly. See yearly charts.Calculators Age CalculatorNewAge Calculator on Toolspire. Calculate your exact age in years, months and days, the next birthday countdown and age on any date.Calculators Scientific CalculatorNewTrig in degrees or radians, logs, powers, roots, factorial, nCr and nPr, fractions, memory and history. Works on phones.Calculators

Open the full directory

Last updated 23 October 2026Report a problem or suggest a feature