What this calculator does
Left ventricular ejection fraction works out percentage of blood pumped out of the left ventricle with each heartbeat. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaStroke volume = EDV − ESV; Ejection fraction = stroke volume / EDV × 100
The inputs explained
| Field | What to enter |
|---|---|
| End-diastolic volume (mL) | A number, measured in mL. Starts at 120. |
| End-systolic volume (mL) | A number, measured in mL. Starts at 50. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with end-diastolic volume
Every other input is held at the calculator’s starting values while end-diastolic volume varies. Select any row to load that scenario into the calculator.
How the answer changes with end-diastolic volume
| End-diastolic volume (mL) | Ejection fraction | Stroke volume | Reading |
|---|---|---|---|
| 60 | 16.7% | 10 mL | Reduced (HFrEF) |
| 90 | 44.4% | 40 mL | Mildly to moderately reduced (HFmrEF) |
| 120 | 58.3% | 70 mL | Normal |
| 180 | 72.2% | 130 mL | Above the typical range: can reflect hypertrophic cardiomyopathy or a measurement issue |
| 240 | 79.2% | 190 mL | Above the typical range: can reflect hypertrophic cardiomyopathy or a measurement issue |
| 360 | 86.1% | 310 mL | Above the typical range: can reflect hypertrophic cardiomyopathy or a measurement issue |