A tool to support the clinical decisions of doctors and health professionals, not for self-diagnosis or self-treatment.
This calculator is inside the patient's file in Clinicato: open it from "Medical tools" while you chart the visit, it fills in from the patient's details and vital signs where they are recorded, and adds its result to the visit's plan in one tap, with the "Medical tools" add-on. Try it in your clinic
Calculator
How it works and when to use it
MAP ≈ diastolic + (systolic − diastolic) ÷ 3, since the heart spends about two thirds of the cycle in diastole.
The calculator flags a MAP under 65 mmHg, the initial target of the Surviving Sepsis Campaign guidelines in septic shock.
Reference: MAP ≈ DBP + (SBP − DBP) / 3; target 65 mmHg in septic shock: Surviving Sepsis Campaign guidelines 2021
Frequently asked questions
Why does MAP matter and not only systolic pressure?
It reflects the perfusion pressure that carries blood to organs such as the kidneys and brain over the whole cardiac cycle.
Is the formula accurate at fast heart rates?
It is an approximation, at very fast rates diastole shortens and it loses accuracy, and arterial lines measure it directly.
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Clinic software for this specialty
Try Clinicato for your clinic
These calculators are free here for everyone, and in Clinicato 49 medical tools work inside the patient's file with the "Medical tools" add-on: filled from the visit and the vital signs, with the result added to the visit's plan, next to appointments, prescriptions and invoices.