Stroke Volume
Select input method and enter the required parameters to compute stroke volume. Ventricular volumes also yield ejection fraction.
How to Use This Calculator
Choose the available data
Select ventricular volumes when imaging measurements are available, or use cardiac output with heart rate from hemodynamics.
Enter accurate measurements
Ensure volumes are in milliliters, cardiac output in liters per minute, and heart rate in beats per minute.
Interpret results in context
Compare stroke volume and ejection fraction with normal ranges, clinical symptoms, and imaging findings.
Formula
Stroke volume = End-diastolic volume − End-systolic volume
Stroke volume = (Cardiac output × 1000) ÷ Heart rate
Ejection fraction (%) = (Stroke volume ÷ End-diastolic volume) × 100.
Full Description
Stroke volume is the amount of blood ejected by the ventricle with each heartbeat. It can be calculated using volumetric imaging (echocardiography, MRI) or derived from cardiac output measurements. Stroke volume, together with heart rate, determines cardiac output and is fundamental for assessing cardiac performance, preload, afterload, and contractility.
Frequently Asked Questions
What are normal stroke volume values?
Typical resting stroke volume ranges from 60–100 mL/beat, varying with body size and conditioning.
Can I use thermodilution data?
Yes. Cardiac output from thermodilution or Fick methods can be combined with heart rate to derive stroke volume.
How does valve regurgitation affect results?
Stroke volume reflects total forward flow; severe regurgitation may increase stroke volume while reducing effective forward output.
Should body surface area be considered?
Indexing stroke volume to BSA (SVI) is useful in pediatrics and small adults; normal SVI is approximately 33–47 mL/m².