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Ejection Fraction (EF%) measures the percentage of blood pumped out of the left ventricle with each heartbeat: EF% = (Stroke Volume / End-Diastolic Volume) x 100. Stroke volume can be entered directly, or derived from end-diastolic and end-systolic volume (SV = EDV - ESV). The commonly cited normal range is roughly 55-70%. This calculator is for general reference and educational purposes only — it is not a medical diagnosis. Consult a doctor for actual cardiac function assessment.
How it works
Choose which values you have (stroke volume and EDV, or EDV and ESV), enter them, and the tool computes EF% and classifies it against the commonly cited normal range.
- Enter given values.
- Enter end-diastolic volume (mL).
- Enter stroke volume (mL).
- Enter end-systolic volume (mL).
- Click Calculate to see your results.
Examples
EDV 120 mL, ESV 50 mL
SV = 120 - 50 = 70 mL. EF% = (70/120) x 100 = 58.3% — within the commonly cited normal range.
Who should use it
- Reviewing echocardiogram or cardiac MRI results alongside a doctor.
- Cardiology and physiology education.
Industry applications
- Cardiology reference
- Cardiac imaging education
Advantages
- Simple, transparent formula supporting two common input combinations.
- Widely referenced normal range for context.
Limitations
- Requires already-measured ventricular volumes from imaging.
- EF% alone does not capture all aspects of heart function.
Common mistakes to avoid
- Mixing up end-diastolic volume (EDV, when the ventricle is fullest) and end-systolic volume (ESV, when it is emptiest).
- Treating a single EF% measurement as definitive rather than considering measurement variability across imaging methods.
Best practices
- Use volumes from the same imaging study and modality for a consistent, comparable EF% value.
Tips
- Track ejection fraction trends over time using the same imaging modality where possible.