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Stroke Volume Calculator

Health

Calculate stroke volume from echocardiographic end-diastolic and end-systolic volumes, plus the resulting ejection fraction and normal-range interpretation.

Reviewed by the thecalcu.com team · Last updated July 10, 2026

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.

Why Use a Stroke Volume Calculator?

Subtracting two volumes and then dividing by the larger one to get a percentage is simple arithmetic, but doing it repeatedly while reviewing multiple echocardiographic reports is tedious. This calculator returns both stroke volume and ejection fraction instantly, along with an interpretation against the normal range.

It's a useful reference for quickly cross-checking a reported ejection fraction against the underlying volume measurements, or for students learning the volumetric method.

Who Should Use This Calculator?

Cardiology and sonography students learning the volumetric method for stroke volume and ejection fraction can use this tool to check worked examples against the standard formula. Clinicians reviewing recorded ventricular volumes from a prior echocardiographic or MRI study may also use it as a quick calculation reference.

This calculator is strictly for informational and educational purposes and is not a substitute for a full echocardiographic or cardiac MRI study or a qualified healthcare provider's interpretation of ventricular function.

What Insights Does the Stroke Volume Calculator Give You?

Stroke Volume is the primary result, the volume of blood ejected per heartbeat, in milliliters.

Ejection Fraction shows stroke volume as a percentage of end-diastolic volume, a widely used measure of pumping efficiency.

Interpretation classifies the ejection fraction as normal, mildly to moderately reduced, reduced, or above the normal range, based on standard echocardiographic guideline thresholds.

How to use this Stroke Volume calculator

  1. Enter the End-Diastolic Volume in milliliters, as measured by echocardiography or cardiac MRI.
  2. Enter the End-Systolic Volume in milliliters.
  3. Review the Stroke Volume result shown in the result card.
  4. Review the Ejection Fraction and its interpretation alongside the stroke volume.
  5. Discuss any reduced or unexpectedly high ejection fraction with a qualified healthcare provider.
Show formula & methodology ↓Show less ↑

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

What is stroke volume?
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.
What is the volumetric stroke volume formula?
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.
How does this differ from the Doppler stroke volume method?
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.
Why does this calculator also show ejection fraction?
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.
What is a normal ejection fraction?
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.
What does a reduced ejection fraction indicate?
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.
Can ejection fraction be too high?
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.
How are EDV and ESV typically measured?
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.
Does stroke volume alone tell you if the heart is healthy?
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.
How does stroke volume relate to cardiac output?
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.
Is this calculator a substitute for a cardiologist's interpretation?
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.
Also known as
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