Mean Arterial Pressure Calculator

Q: Why is MAP not simply the average of systolic and diastolic pressure?

At ordinary heart rates, diastole lasts longer than systole, so the common approximation gives diastolic pressure more weight.

Q: Is cuff-derived MAP the same as invasively measured MAP?

No. This is an approximation from two cuff values and may differ from monitor-derived or invasive measurements.

Q: Can this calculator diagnose a condition or recommend treatment?

No. It performs the displayed arithmetic for education and verification. Diagnosis, treatment, medication, testing, and emergency decisions require qualified clinical assessment.

Q: Why might a hospital system show a different result?

Equation version, input units, rounding, laboratory methods, timestamps, protocol definitions, and patient-specific rules can produce differences. Confirm the exact method required in the clinical setting.

Q: Is entered medical information saved or transmitted?

No. The calculation runs locally in the browser and this page does not create a patient record or account.

Q: Does the result include calculation steps?

Yes. A successful result shows four colored details and five steps using the entered values and selected equation.

What is the Mean Arterial Pressure Calculator?

Estimate mean arterial pressure from one systolic and diastolic blood-pressure pair. The calculator uses the common resting-heart-rate approximation that weights diastole for two-thirds of the cardiac cycle.

When the same clinical record includes the required inputs, the Pulse Pressure Calculator can calculate pulse pressure from systolic and diastolic blood pressure.

This page is designed for transparent arithmetic, not automated medical judgment. Use values from the same encounter and measurement period, preserve the stated units, and record which equation version was used. A correct calculation can still be clinically inappropriate when the population, timing, laboratory method, or required protocol does not match the equation.

How to use the Mean Arterial Pressure Calculator

Collect Systolic blood pressure, Diastolic blood pressure from a reliable source. Check identifiers and timestamps outside this page, confirm that the values belong together, and never estimate a clinical finding merely to complete a form.

Confirm the calculator, equation version, intended population, units, and applicable institutional protocol.
Enter every requested value or selection exactly as documented. The calculator rejects blank and unsupported entries.
Select Calculate Mean Arterial Pressure, then review the primary result, status badge, scale, four supporting values, safety note, and calculation steps.

For a separate but related calculation, use the QTc Calculator to calculate heart-rate-corrected QT using Bazett or Fridericia correction.

Independently verify any result that could influence care. Recheck decimal placement, unit conversion, age or sex convention, component definitions, laboratory bounds, and whether a value was measured before or after an intervention.

Formula and calculation method

MAP ≈ diastolic pressure + (systolic pressure − diastolic pressure) ÷ 3

The calculator uses the common resting-heart-rate approximation that weights diastole for two-thirds of the cardiac cycle. Intermediate arithmetic retains extra precision and the displayed result is rounded for readability. The calculation runs locally in the browser.

Clinical equations are compact models of selected information. They do not include every symptom, examination finding, comorbidity, medication, measurement limitation, or change over time. Where the source method applies bounds, weights, or categories, those rules are stated on this page and reflected in the steps.

How to understand the result

The large gradient figure is the primary calculated value or score. The colored cards show inputs, intermediate values, component totals, or an alternative representation. The visual scale is an orientation aid only; it is not a diagnosis, alarm threshold, treatment order, or substitute for a validated clinical pathway.

Interpretation must consider why the calculation was ordered, who the equation was validated for, whether the patient is stable, and whether repeat or direct measurement is available. Clinical scores that include judgment-based findings should be completed only by someone trained to assess those findings.

When results appear inconsistent with the clinical picture, stop and verify the original data rather than forcing the value into an expected category. Trends may be more informative than one isolated result, but only when the method and units remain comparable.

Worked example and practical interpretation

A blood pressure of 120/80 mmHg produces an estimated mean arterial pressure of about 93.3 mmHg.

If that question is relevant to the same review, the CHA₂DS₂-VASc Calculator provides a distinct method to calculate the traditional CHA₂DS₂-VASc stroke-risk factor score for atrial fibrillation.

The example demonstrates the displayed equation rather than a recommendation for a real patient. Replace every example value with verified information, then compare the result with the source document, applicable guideline, and local workflow. Do not copy an example result into a medical record.

Accuracy, safety, and limitations

This approximation can be less accurate with marked tachycardia, arrhythmia, altered waveforms, invasive monitoring, or rapidly changing hemodynamics.

Medical safety notice: This calculator is for education and independent arithmetic review. It cannot diagnose, triage, prescribe, select treatment, establish medication dosing, or replace a licensed clinician, verified laboratory report, ECG review, official transplant system, or institutional protocol. Seek emergency help for urgent symptoms or deterioration.