# Left Ventricular Ejection Fraction Estimator (LVEF) Compute LVEF = (EDV − ESV) / EDV. Normal 50–70%; <40% HFrEF; >70% hyperdynamic. Derived from Lang JASE 2015, Ponikowski ESC 2016, StatPearls, LITFL, Braunwald. Not medical advice. > Canonical page: https://elysiatools.com/en/tools/ejection-fraction-estimator - **Category:** Health - **Keywords:** ejection fraction, lvef, ef, end diastolic volume, edv, end systolic volume, esv, stroke volume, heart failure, hfrEF, hfmrEF, systolic function, cardiology, echocardiography ## Overview The Left Ventricular Ejection Fraction Estimator calculates LVEF from end-diastolic volume (EDV) and end-systolic volume (ESV) using LVEF = (EDV − ESV) / EDV. It also reports stroke volume and an ejection-fraction category. This tool is for estimation and education, not medical advice. ## Inputs - **End-Diastolic Volume EDV (mL)** (number): Left ventricular end-diastolic volume (mL) from echo/MRI/angiography. - **End-Systolic Volume ESV (mL)** (number): Left ventricular end-systolic volume (mL). Must be ≤ EDV. - **Decimal Places** (number) ## When to use - Estimate LVEF from EDV and ESV values obtained from cardiac imaging. - Calculate stroke volume and review whether the result falls within the tool's reference categories. - Check the arithmetic behind an echocardiography, MRI, angiography, or other cardiac imaging measurement. ## How it works - Enter the left ventricular end-diastolic volume (EDV) in milliliters. - Enter the left ventricular end-systolic volume (ESV) in milliliters; ESV must be less than or equal to EDV. - The tool calculates stroke volume as EDV − ESV and LVEF as stroke volume divided by EDV. - The result returns LVEF as a percentage, an ejection-fraction category, and the selected number of decimal places. ## Use cases - Reviewing LVEF calculations from echocardiography or other cardiac imaging measurements. - Teaching the relationship between EDV, ESV, stroke volume, and systolic function. - Performing a quick arithmetic check when documenting or studying cardiac volume data. ## Frequently asked questions ### What inputs does the estimator require? Enter EDV and ESV in milliliters. You can also set the number of decimal places. ### What is the LVEF formula? LVEF = (EDV − ESV) / EDV. The result is also shown as a percentage. ### What is stroke volume? Stroke volume is the difference between EDV and ESV: SV = EDV − ESV. ### How are the results categorized? The tool identifies normal ejection fraction at 50–70%, reduced ejection fraction below 40%, and hyperdynamic ejection fraction above 70%. ### Can this result diagnose heart disease? No. LVEF depends on measurement and loading conditions, so the result should be interpreted by a qualified healthcare professional. ## Related tools - [A-a Gradient (Alveolar-Arterial O₂)](https://elysiatools.com/en/tools/a-a-gradient-calculator): Calculate the alveolar-arterial O₂ gradient to distinguish hypoxemia causes. PAO₂ = FiO₂×(P_atm−47) − PaCO₂/0.8; A-a = PAO₂ − PaO₂. Normal ≈ (Age+10)/4. Elevated → V/Q mismatch, shunt, diffusion impairment. 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