Hemodynamics

Ejection Fraction (EF) Calculator

Percent of end-diastolic volume ejected with each beat; the main measure of left ventricular systolic function.

Reviewed by Alex G, BSN, RN, CEN, CCRN, CMC, NREMT-P · From the Reference tab of the app

Turn on JavaScript to use this calculator, or open it in the web app.

Formula

((EDV - ESV) / EDV) * 100

Reference: Normal (preserved) 50% or more

How it is used

• Heart failure by LVEF (2022 AHA/ACC/HFSA): reduced (HFrEF) 40% or less, mildly reduced 41–49%, preserved 50% or more; improved (HFimpEF) was 40% or less and is now above 40%.
• EF is a fraction, not a flow: a small, stiff ventricle can eject a normal fraction of a small volume and still give a low stroke volume.
• In practice EF comes from echocardiography; the volumes here are for working the formula.

Same formula as the app. Open it in the web app.

Related one-pagers

• Shock Types at a GlanceCardiogenic · Poor LV function, dilated · Full IVC; B-lines; effusions · Usually normal
• Hemodynamic NormalsContractility · EF, upstroke slope, CI · Inotropes, catecholamines · Ischemia, acidosis, sepsis, beta-blockers
• Equipment, Gas Supply and Patient DataEffusion · Upright: blunted angle and meniscus; massive: shift away
• ICU Nutrition and RefeedingEFFORT Protein 2023, n 1,329 · Protein ≥2.2 vs ≤1.2 g/kg/day · No benefit; possible harm in AKI

Related calculators

• Cardiac Index (CI)
• Cardiac Output (Fick Principle)
• Cardiac Output (HR × SV)
• Cerebral Perfusion Pressure (CPP)
• Coronary Perfusion Pressure
• Mean Arterial Pressure (MAP)
• Oxygen Delivery (DO₂)
• Pulmonary Vascular Resistance (PVR)

For education and exam preparation only. Follow your institution’s protocols. For education and exam preparation only. Verify results independently and follow your institution’s protocols. Not a substitute for clinical judgment.