Stroke Volume Calculator
HealthCalculate stroke volume from echocardiographic end-diastolic and end-systolic volumes, plus the resulting ejection fraction and normal-range interpretation.
End-Diastolic Volume
mL
End-Systolic Volume
mL
Stroke Volume
0mL
Ejection Fraction — Normal: 55-70%
0% · —
Not a substitute for clinical evaluation. Ventricular volumes and function should be interpreted by a qualified healthcare provider alongside full imaging data.
What is a Stroke Volume?
The Stroke Volume Calculator computes left ventricular stroke volume using the volumetric (echocardiographic) method: end-diastolic volume minus end-systolic volume. Since both volumes are already entered, the calculator also returns ejection fraction as a bonus output.
Enter your end-diastolic and end-systolic volumes to see stroke volume, ejection fraction, and a normal-range interpretation. For the Doppler-based alternative method, see the Doppler Echo Cardiac Output Calculator; for related hemodynamic tools, see the Cardiac Index Calculator and Cardiac Output Calculator.
How to use this Stroke Volume calculator
- Enter the End-Diastolic Volume in milliliters, as measured by echocardiography or cardiac MRI.
- Enter the End-Systolic Volume in milliliters.
- Review the Stroke Volume result shown in the result card.
- Review the Ejection Fraction and its interpretation alongside the stroke volume.
- Discuss any reduced or unexpectedly high ejection fraction with a qualified healthcare provider.
Formula & Methodology
Stroke Volume (mL) = End-Diastolic Volume − End-Systolic Volume Ejection Fraction (%) = (Stroke Volume ÷ End-Diastolic Volume) × 100 Normal ejection fraction: 55-70%, per American Society of Echocardiography chamber quantification guidelines. Worked example: An end-diastolic volume of 120 mL and an end-systolic volume of 50 mL give stroke volume = 120 − 50 = 70 mL, and ejection fraction = 70 ÷ 120 × 100 ≈ 58.3%, which falls within the normal range.
Frequently Asked Questions
Stroke volume is the amount of blood the left ventricle ejects with each heartbeat, calculated as the difference between the end-diastolic volume (the volume just before contraction) and the end-systolic volume (the volume just after contraction). It is a fundamental measure of cardiac pumping function.
Stroke Volume = End-Diastolic Volume (EDV) − End-Systolic Volume (ESV), both measured in milliliters, typically from echocardiographic or cardiac MRI volume measurements of the left ventricle.
This calculator uses the volumetric (echocardiographic) method, based directly on measured ventricular volumes. The Doppler Echo Cardiac Output Calculator instead uses the LVOT-Doppler method, deriving stroke volume from the left ventricular outflow tract area and the velocity-time integral — a different technique that doesn't require volume tracing.
Since end-diastolic and end-systolic volumes are already being entered to calculate stroke volume, ejection fraction (stroke volume divided by end-diastolic volume, expressed as a percentage) is a natural bonus output that gives additional clinically meaningful context about pumping efficiency.
A normal left ventricular ejection fraction is generally considered to be 55-70%, based on American Society of Echocardiography chamber quantification guidelines. Values below or above this range can reflect reduced or hyperdynamic ventricular function, respectively.
A reduced ejection fraction can indicate systolic dysfunction, where the heart muscle isn't contracting as forcefully as expected, and is associated with conditions like heart failure with reduced ejection fraction. The specific cause and severity require full clinical and imaging evaluation.
An ejection fraction above the normal range (a hyperdynamic state) can occur with conditions like severe volume depletion, anemia, or certain valve diseases, and while not always abnormal, it's worth discussing with a clinician if unexpected.
End-diastolic and end-systolic volumes are most commonly measured using echocardiography (via volumetric tracing methods like the biplane Simpson's method) or cardiac MRI, both of which directly visualize and measure the ventricular cavity at each phase of the cardiac cycle.
Not entirely — stroke volume must be interpreted alongside heart rate (to derive cardiac output), ejection fraction, and the broader clinical picture, since a normal stroke volume can coexist with other cardiac abnormalities not captured by volume measurements alone.
Cardiac output equals stroke volume multiplied by heart rate, so stroke volume is one of the two key inputs to cardiac output. See the Cardiac Output Calculator or Cardiac Index Calculator for tools that combine stroke volume with heart rate and body size.
No — this tool is for informational and educational purposes only and performs the underlying stroke volume and ejection fraction arithmetic. A full echocardiographic or cardiac MRI study interpreted by a qualified healthcare provider is required for any clinical assessment of ventricular function.
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