About this Mean Arterial Pressure
MAP is often used in critical care to assess if there is enough blood pressure to supply the organs. The heart spends more time in diastole (filling) than systole (pumping), so the MAP calculation weighs diastolic pressure more heavily.
Who this calculator is for
- Clinicians, nurses, and trainees reviewing noninvasive blood-pressure readings.
- People trying to understand why MAP is discussed instead of systolic pressure alone.
- Anyone who needs a quick estimated MAP from standard cuff values.
When to use it
- Use this calculator when you have systolic and diastolic values and want an estimated perfusion pressure.
- Use it for chart review, teaching, or noninvasive bedside calculations.
- Use it to compare serial blood-pressure readings in a consistent way.
How to use this calculator
- Enter Systolic BP.
- Enter Diastolic BP.
- The result is the weighted average pressure.
Key assumptions
- This is the standard cuff-based estimate, not a direct arterial-line mean.
- The formula assumes a typical cardiac cycle where diastole lasts longer than systole.
- MAP is helpful for context, but pressure alone does not fully define tissue perfusion.
Accuracy and testing
Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.
Key Features
- Instant Calculation
- Private & Secure
- Mobile Optimized
Things to Keep in Mind
MAP is an estimate. Direct invasive measurement (arterial line) is the gold standard. Formulas may vary slightly between institutions.