`SV = ( "End Diastolic Volume" ) – ( "End Systolic Volume" )`

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Stroke Volume (SV) , in cardiovascular physiology,  is the volume of blood pumped out by the left ventricle of the heart in one contraction or beat measured in mL/beat (millilitres per beat). That notwithstanding, the term stroke volume can also apply to the right ventricles of the heart, although it usually refers to the left ventricle. 

   SV = Stroke Volume
 EDV = End Diastolic Volume
 ESV = End Systolic Volume

Stroke volume is affected by several factors including:

• The Preload( determined by Increase speed of volume of venous return and Frank-Starling's Law of the Heart),
• Contractility (This results in better ejection of the blood in the ventricles controlled by extrinsic factors),and
• The Afterload ( a factor of blood pressure).

EXAMPLE

Suppose the heart fills up to 230ml of blood before contraction and leaves 65ml in the heart after contraction, what will the stroke volume?

EDV -ESV = 230ml - 65ml

= 165ml/beat