Stroke Volume Calculator
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Stroke volume is the amount of blood the left ventricle pumps with each beat, typically 60 to 100 mL in adults. With a cardiac output of 5 L/min and a heart rate of 70, it is about 71 mL.
Type the problems from this lesson and check each step.
| Stroke volume | 71.43 mL |
| Typical adult range | about 60 to 100 mL |
| Cardiac output at 70 bpm | 5 L/min |
| Stroke volume index | 37.59 mL/m² |
Show steps
- SV = cardiac output ÷ heart rate = 5 L/min × 1000 ÷ 70 bpm = 71.43 mL.
Three formulas
- SV = cardiac output ÷ heart rate (× 1,000 for mL).
- SV = EDV − ESV; ejection fraction = SV ÷ EDV.
- SV = π(d/2)² × VTI from echocardiography.
Normal values
Stroke volume is about 60 to 100 mL and stroke volume index about 33 to 47 mL/m² in healthy adults; ejection fraction is normally about 55% to 70%.
Why it matters
Cardiac output = stroke volume × heart rate. When stroke volume falls, as in heart failure or dehydration, the heart rate often rises to compensate.
Stroke Volume Calculator quiz: 10 questions
Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.
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Frequently asked questions
What is a normal stroke volume?
About 60 to 100 mL per beat in adults.
What is stroke volume index?
SV divided by body surface area, which compares people of different sizes.
How is SV measured?
By echocardiography (LVOT VTI), cardiac MRI, or invasive monitoring.
Is SV the same as ejection fraction?
No. EF is SV as a percentage of EDV.
Is this for patients?
It is a learning and reference tool; clinicians interpret measured values.
Sources
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