Calculator Form
Example Data Table
| Scenario | Method | Input Values | Stroke Volume | Notes |
|---|---|---|---|---|
| Case 1 | Direct | EDV 130 mL, ESV 55 mL | 75 mL/beat | Basic volume subtraction example. |
| Case 2 | Direct | EDV 120 mL, ESV 50 mL | 70 mL/beat | Typical comparison case. |
| Case 3 | CO and HR | CO 5.6 L/min, HR 80 bpm | 70 mL/beat | Derived from flow and rate. |
| Case 4 | EF | EDV 125 mL, EF 60% | 75 mL/beat | Fraction-based estimate. |
| Case 5 | Direct | EDV 150 mL, ESV 60 mL | 90 mL/beat | Higher forward volume case. |
Formula Used
Stroke volume is the blood volume ejected per heartbeat.
Direct method: SV = EDV − ESV
Flow-rate method: SV = (CO × 1000) ÷ HR
Ejection fraction method: SV = (EF ÷ 100) × EDV
Cardiac output check: CO = (SV × HR) ÷ 1000
Stroke volume index: SVI = SV ÷ BSA
Where EDV is end-diastolic volume, ESV is end-systolic volume, CO is cardiac output, HR is heart rate, EF is ejection fraction, and BSA is body surface area.
How to Use This Calculator
- Select a calculation method.
- Enter the required heart-flow values for that method.
- Add heart rate if you also want cardiac output confirmation.
- Add body surface area to compute stroke volume index.
- Press the calculate button.
- Review the result block above the form.
- Use the chart to compare the calculated relationship.
- Download the result as CSV or PDF if needed.
About Stroke Volume
Stroke volume describes how much blood leaves the left ventricle during one heartbeat. It is a volume-per-beat measure. In a practical model, it links chamber filling, chamber emptying, and total flow rate.
This calculator supports three common paths. The first path uses end-diastolic volume and end-systolic volume. The second path uses cardiac output and heart rate. The third path uses ejection fraction with end-diastolic volume. These options help when one dataset is available and another is missing.
The direct equation is simple. Subtract the remaining ventricular volume after contraction from the filled ventricular volume before contraction. The result is forward ejected volume per beat. This method is widely used because the variables are easy to interpret.
The flow-rate method is also useful. Cardiac output is volume per minute, while stroke volume is volume per beat. Dividing minute flow by beats per minute converts the value into milliliters per beat. This is helpful when monitoring systems report output and rate directly.
The ejection fraction method estimates stroke volume from a percentage relationship. It connects chamber filling to the fraction pushed out during systole. When end-diastolic volume and ejection fraction are known, the calculator can derive stroke volume quickly.
Extra outputs improve comparison. Ejection fraction, residual fraction, cardiac output, daily pumped volume, and stroke volume index can all add context. These values make scenario testing easier when you compare rest, exercise, or different assumptions.
The chart gives a quick visual summary after submission. The export tools help save calculations for reports, worksheets, or classroom review. This page is best used for learning, estimation, and structured comparison rather than diagnosis.
FAQs
1. What is stroke volume?
Stroke volume is the amount of blood ejected from a ventricle during one heartbeat. It is usually expressed in milliliters per beat and helps describe pumping performance.
2. Which formula should I use?
Use the direct method when EDV and ESV are known. Use the flow-rate method when cardiac output and heart rate are available. Use the ejection fraction method when EF and EDV are known.
3. Why must EDV be greater than ESV?
EDV is the filled volume before contraction. ESV is the remaining volume after contraction. The starting volume must exceed the remaining volume for the result to make physical sense.
4. Can this calculator also estimate cardiac output?
Yes. If heart rate is available, the page calculates cardiac output from stroke volume. It also estimates daily pumped volume for a broader flow summary.
5. What is stroke volume index?
Stroke volume index adjusts stroke volume by body surface area. It helps compare pumping output between people with different body sizes.
6. What units are used here?
Volumes are entered in milliliters, cardiac output in liters per minute, heart rate in beats per minute, and body surface area in square meters.
7. Does the chart provide a diagnosis?
No. The chart is only a visual summary of the entered values and calculated result. It is useful for learning and review, not for clinical decisions.
8. Can I use this page for scenario comparison?
Yes. Enter different assumptions one at a time, review the result block, and export the outcomes. The example table also helps with quick benchmarking.