Estimates mean arterial pressure from systolic and diastolic blood pressure.
Overview
Estimates mean arterial pressure from systolic and diastolic blood pressure.
Clinical Significance
Provides a conventional estimate at normal heart rates. Accuracy falls with marked tachycardia, bradycardia or abnormal arterial waveforms.
When to Use
- Use when the required measurements are available, reliable and clinically relevant.
How It Is Calculated
- MAP ≈ (SBP + 2 × DBP) / 3.
Interpretation
- Provides a conventional estimate at normal heart rates. Accuracy falls with marked tachycardia, bradycardia or abnormal arterial waveforms.
Worked Example
Enter valid values in the displayed units. MedicalC then applies: MAP ≈ (SBP + 2 × DBP) / 3.
Limitations
- The result does not establish a diagnosis or mandate treatment.
- Measurement error may be more important than arithmetic precision.
- Published thresholds may differ between populations and settings.
Clinical Pearls
- Document the source values and units with the final result.
- Review trends rather than isolated values where appropriate.
Common Mistakes
- Using the wrong unit.
- Combining values from different time points.
- Applying the result outside the intended measurement or clinical context.
Frequently Asked Questions
What does this calculator provide?
Estimates mean arterial pressure from systolic and diastolic blood pressure.
What formula is used?
MAP ≈ (SBP + 2 × DBP) / 3.
Can the result be used alone?
No. It must be interpreted with the full clinical assessment and appropriate investigations.
What is the main limitation?
The result depends on accurate source measurements, correct units and appropriate clinical applicability.
References
- Standard haemodynamic approximation. — Primary, supporting or authoritative reference for the implemented relationship.
Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026