The Ejection Fraction calculator computes the Ejection Fraction based on the end-systolic and end-diastolic volumes.
INSTRUCTIONS: Choose units and enter the following:
- (EDV) End-Diastolic Volume
- (ESV) Systolic Volume
Ejection Fraction (Ef): The calculator returns the fraction as a percentage.
The Math / Science
Ejection Fraction (EF) is the fraction of blood ejected by the Left Ventricle (LV) during the contraction or ejection phase of the cardiac cycle or Systole. `E_f` is commonly measured by echocardiography, in which the volumes of the heart's chambers are measured during the cardiac cycle. The Ejection Fraction equation is:
Ef = (EDV - ESV) / EDV
where:
- Ef = Ejection Fraction
- ESV = End-Systolic Volume
- EDV = End-Diastolic Volume
In cardiovascular physiology, ejection fraction (EF) represents the volumetric fraction of blood pumped out of the left and right ventricle with each heartbeat or cardiac cycle. In finite mathematics allowed by medical imaging, EF is applied to both the right ventricle, which ejects blood via the pulmonary valve into the pulmonary circulation, or the left ventricle, which ejects blood via the aortic valve into the cerebral and systemic circulation.
Systolic and Diastolic Volume
End Diastolic Volume (EDV) is the volume of the ventricle before the heart contracts. End Systolic Volume (ESV) is the ventricle volume after blood has been ejected from the heart.
The typical end diastolic volume for a the average male is 120 milliliters of blood, and 50 milliliters of end-systolic blood.
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