Ejection Fraction
Calculate left ventricular ejection fraction (LVEF) from EDV and ESV to assess heart pumping function. Get EF percentage, stroke volume, and clinical interpretation with charts.
About This Calculator
The Ejection Fraction Calculator (LVEF) computes the left ventricular ejection fraction from two simple cardiac volume measurements: end-diastolic volume (EDV) — the amount of blood in the ventricle just before contraction — and end-systolic volume (ESV) — the blood remaining after contraction. Ejection fraction is one of the most important clinical parameters for assessing cardiac function and diagnosing heart failure.
The ejection fraction is calculated using the formula LVEF = (Stroke Volume / EDV) × 100%, where Stroke Volume = EDV − ESV. A normal left ventricle ejects approximately 50–70% of its blood volume with each contraction. When the EF falls below 40%, it indicates systolic heart failure (HFrEF). Between 41–49% is classified as moderately reduced EF (HFmrEF), and above 75% may suggest hypertrophic cardiomyopathy. Understanding your EF helps clinicians determine the type of heart failure, guide medication selection (beta-blockers, ACE inhibitors, ARNIs, SGLT2 inhibitors), and monitor treatment response over time.
Regional Notes
India: Echocardiography is widely available in Indian cardiology centers, with a standard 2D echo costing ₹1,500–₹4,000. The Cardiological Society of India (CSI) guidelines recommend EF assessment for all patients presenting with dyspnea or suspected heart failure. Rural outreach programs increasingly use portable echo machines for community screening. The prevalence of rheumatic heart disease means EF interpretation must account for valvular pathology common in Indian populations.
United States: The American College of Cardiology (ACC) and American Heart Association (AHA) guidelines classify HF based on LVEF: HFrEF (≤40%), HFmrEF (41–49%), and HFpEF (≥50%). Echocardiography is the first-line imaging modality, with cardiac MRI reserved for cases where echo is technically inadequate. Medicare and private insurance cover EF testing under diagnostic imaging benefits. Normal reference values are established from the Framingham Heart Study and MESA cohort data.
United Kingdom: NICE guideline NG106 recommends echocardiography for all patients with suspected heart failure, with EF measured by Simpson's biplane method. The NHS offers echo through cardiology departments and community diagnostics hubs. The British Society of Echocardiography (BSE) provides accreditation and publishes minimum standards for chamber quantification. The UK National Heart Failure Audit tracks EF-based outcomes across all NHS trusts.
This tool is intended for educational reference. Ejection fraction should always be measured by proper imaging studies and interpreted by a qualified healthcare professional in the context of the complete clinical picture.
Frequently Asked Questions
What is ejection fraction and how is it measured?
Ejection fraction (EF) is the percentage of blood pumped out of the left ventricle with each heartbeat. It is calculated as LVEF = (EDV − ESV) / EDV × 100%, where EDV is end-diastolic volume and ESV is end-systolic volume. EF is most commonly measured using echocardiography (echo), but can also be assessed with cardiac MRI, CT scan, or nuclear stress testing. A normal ejection fraction ranges from 50% to 70%.
What is a normal ejection fraction range?
A normal left ventricular ejection fraction (LVEF) is between 50% and 70%. Values between 41% and 49% indicate moderately reduced ejection fraction (HFmrEF), which may suggest mild heart impairment. Values of 40% or below indicate reduced ejection fraction (HFrEF), which is associated with systolic heart failure and warrants prompt medical evaluation. An EF above 75% may indicate hypertrophic cardiomyopathy where the heart muscle is abnormally thickened.
What does HFrEF, HFmrEF, and HFpEF mean?
HFrEF (heart failure with reduced ejection fraction) refers to LVEF of 40% or below, where the heart muscle cannot contract effectively. HFmrEF (heart failure with moderately reduced ejection fraction) refers to LVEF between 41% and 49%, a borderline range where function is mildly impaired. HFpEF (heart failure with preserved ejection fraction) refers to LVEF of 50% or above despite heart failure symptoms, often due to stiff heart muscle that cannot relax properly. All three types require medical management.
Can ejection fraction improve with treatment?
Yes, ejection fraction can improve with appropriate treatment. Medications such as beta-blockers, ACE inhibitors, ARBs, SGLT2 inhibitors, and diuretics can help improve heart function. Lifestyle modifications including a low-sodium diet, regular exercise, smoking cessation, and weight management also contribute to EF improvement. In some cases, devices like pacemakers or ICDs may be recommended. Improvement typically occurs over weeks to months of consistent treatment and monitoring.
What are the symptoms of reduced ejection fraction?
Symptoms of reduced ejection fraction (HFrEF) include shortness of breath (dyspnea), especially during exertion or when lying flat, fatigue and weakness, swelling in the legs, ankles, and feet (edema), rapid or irregular heartbeat, reduced exercise tolerance, persistent cough or wheezing, sudden weight gain from fluid retention, and increased need to urinate at night. These symptoms develop gradually and may worsen over time without treatment.
What is the difference between stroke volume and ejection fraction?
Stroke volume (SV) is the absolute volume of blood pumped out of the left ventricle per beat, calculated as EDV minus ESV. Ejection fraction (EF) is the percentage of EDV that is ejected: EF = SV / EDV × 100%. For example, an EDV of 120 mL and ESV of 50 mL gives SV = 70 mL and EF = 58%. Stroke volume depends on body size, while EF adjusts for size and reflects pumping efficiency. A normal EF (50–70%) with low SV may indicate HFpEF.
How is ejection fraction calculated in echocardiography?
Echocardiography measures ejection fraction using the Simpson's biplane method. The sonographer traces the endocardial border of the left ventricle in both 2-chamber and 4-chamber apical views at end-diastole and end-systole. The software computes EDV and ESV volumes using the disc summation method (modified Simpson's rule), then calculates LVEF = (EDV − ESV) / EDV × 100%. 3D echocardiography offers even more accurate volumetric measurements without geometric assumptions.
Can I rely on this calculator for medical decisions?
No. This calculator is for educational and reference purposes only. Ejection fraction is a clinical measurement that requires proper imaging studies (echocardiogram, MRI, or CT) interpreted by a qualified healthcare professional. This tool provides a mathematical computation from hypothetical inputs and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a cardiologist with your imaging results for proper evaluation and management.