Stroke volume depends on preload (how full the heart is), afterload (the pressure it pumps against) and contractility. A normal resting stroke volume is about 60–100 mL.
How to use the Stroke Volume Calculator
- Method
- End-diastolic volume
- End-systolic volume
- Cardiac output
- Heart rate
- Height
- Weight
Results update as you type, and every field accepts the units shown in its menu.
How it works
Choose your method and enter the values from an echocardiogram or haemodynamic monitor, plus height and weight for the index.
Inputs explained
| Field | What to enter |
|---|---|
| Method | Choose one: From ventricular volumes, From cardiac output and heart rate |
| End-diastolic volume | In mL |
| End-systolic volume | In mL |
| Cardiac output | In L/min |
| Heart rate | In bpm |
| Height | Units: cm, in, m, ft, mm |
| Weight | Units: kg, lb, st, g |
Example values
How the main result changes when End-diastolic volume changes and everything else stays at the example values above:
| End-diastolic volume (mL) | Stroke volume (mL) |
|---|---|
| 60 | 10 |
| 90 | 40 |
| 120 | 70 |
| 150 | 100 |
| 180 | 130 |
| 240 | 190 |
Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.
Formula
SV = EDV − ESV or SV = CO ÷ HR × 1000
EF = SV ÷ EDV × 100
SVI = SV ÷ BSA
Worked example
Inputs — Method: From ventricular volumes; End-diastolic volume: 120 mL; End-systolic volume: 50 mL; Height: 175 cm; Weight: 75 kg.
Results — Stroke volume = 70 mL; Stroke volume index = 37 mL/m².
Key terms
- EDV
- End-diastolic volume.
- ESV
- End-systolic volume.
Frequently asked questions
What is a normal stroke volume?
About 60–100 mL per beat at rest.
What lowers stroke volume?
Dehydration, blood loss, heart failure, valve disease and very fast heart rates.
How is stroke volume measured?
Usually by echocardiography, cardiac MRI or invasive monitoring.