Goal
Calculate stroke volume and left-ventricular ejection fraction from end-diastolic and end-systolic volumes, with the result kept separate from an echocardiography diagnosis.
Ejection Fraction Calculator
Calculate stroke volume and left-ventricular ejection fraction from end-diastolic and end-systolic volumes, with the result kept separate from an echocardiography diagnosis.
Key facts
- What it does
- Calculate stroke volume and left-ventricular ejection fraction from end-diastolic and end-systolic volumes, with the result kept separate from an echocardiography diagnosis.
- Formula
Stroke volume = EDV − ESV; ejection fraction (%) = [(EDV − ESV) ÷ EDV] × 100.- You enter
- End-diastolic volume (EDV) · End-systolic volume (ESV)
- Worked example
- Stroke volume = 72 mL; ejection fraction = (72 ÷ 120) × 100 = 60%.
A clearer path to an answer
From your question to a useful result
This page keeps the calculation transparent: define the goal, enter the matching values, inspect the method, and decide what the result means in your situation.
Inputs
End-diastolic volume (EDV) · End-systolic volume (ESV)
Method
Stroke volume = EDV − ESV; ejection fraction (%) = [(EDV − ESV) ÷ EDV] × 100.
Next step
Calculate, review the assumptions below, then compare a related tool when the decision needs more context.
Ejection Fraction Calculator
Calculate stroke volume and left-ventricular ejection fraction from end-diastolic and end-systolic volumes, with the result kept separate from an echocardiography diagnosis.
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Result
Enter your values above and choose Calculate to see the result here.
Calculation map
Follow the path from input to answer
01
Inputs (2)
- End-diastolic volume (EDV) Ready
- End-systolic volume (ESV) Ready
02
Formula
Stroke volume = EDV − ESV; ejection fraction (%) = [(EDV − ESV) ÷ EDV] × 100.
Bounded, transparent calculation
03
Result
- Calculate to preview the result.
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Formula, assumptions, and example
Formula: Stroke volume = EDV − ESV; ejection fraction (%) = [(EDV − ESV) ÷ EDV] × 100.
The page calculates the volume ejected per beat and expresses it as a percentage of the end-diastolic volume. It checks that ESV is not greater than EDV and labels any clinical range as context rather than a diagnosis.
- EDV and ESV refer to the same ventricle, beat or measurement context, and volume unit.
- EDV must be greater than zero and ESV must be between zero and EDV.
- The result is a mathematical estimate from entered volumes, not a direct measurement by this page.
- Different imaging methods and measurement assumptions can produce different volume and EF values.
- The displayed context uses common LVEF bands and is not a diagnosis of heart failure or contractility.
- A clinician must interpret EF with symptoms, imaging quality, loading conditions, rhythm, valves, and the full record.
- The calculator does not estimate right-ventricular function, cardiac output, prognosis, or treatment response.
- Urgent chest pain, severe breathlessness, fainting, or blue lips require emergency local care rather than calculation.
Worked example: Stroke volume = 72 mL; ejection fraction = (72 ÷ 120) × 100 = 60%.
Displayed input contract
- End-diastolic volume (EDV) · minimum 0.1 · maximum 5000
- End-systolic volume (ESV) · minimum 0 · maximum 5000
The displayed limits are checked before the handler runs. Model-specific domain checks may also reject impossible or non-finite inputs.
Methodology: This calculator follows the WorldCalculate input, formula, precision, and boundary policy. Read the official methodology.
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Answer-first guide
How to use the Ejection Fraction Calculator for a real question
Calculate stroke volume and left-ventricular ejection fraction from end-diastolic and end-systolic volumes, with the result kept separate from an echocardiography diagnosis. Start with one clearly defined goal, enter values in the units shown, and keep the result attached to the assumptions below.
What this answers
This tool is useful when your question includes ejection fraction calculator, EF calculator, LVEF formula. It returns the outputs declared in the calculator contract rather than a live quote, approval, diagnosis, or professional sign-off.
What you enter
End-diastolic volume (EDV) · End-systolic volume (ESV). Keep the same time period, unit system, and currency wherever the form requires comparable values.
How to check it
Run the worked example first, compare its output with the page's example, then change one input at a time. This makes an unexpected result easier to trace to a unit, boundary, or assumption.
Three checks before you rely on the answer
- Match the question. Confirm that the result means the quantity you need, not a similar-sounding percentage, balance, rate, or estimate.
- Match the inputs. Use the requested units and period, and read each hint before replacing the example values with your own.
- Read the boundary. Review the assumptions and limits. EDV and ESV refer to the same ventricle, beat or measurement context, and volume unit.
Need a wider view? Browse Health Calculators or compare the related tools below. The WorldCalculate methodology explains how formulas, examples, limits, and revisions are reviewed.
How to use the Ejection Fraction Calculator
- Enter End-diastolic volume (EDV) (mL).
- Enter End-systolic volume (ESV) (mL).
- Choose Calculate and read the result panel.
- Use Download PDF or Download Word to save a result sheet.
Formula
Stroke volume = EDV − ESV; ejection fraction (%) = [(EDV − ESV) ÷ EDV] × 100.
The page calculates the volume ejected per beat and expresses it as a percentage of the end-diastolic volume. It checks that ESV is not greater than EDV and labels any clinical range as context rather than a diagnosis.
Worked example
Stroke volume = 72 mL; ejection fraction = (72 ÷ 120) × 100 = 60%.
Assumptions and limits
- EDV and ESV refer to the same ventricle, beat or measurement context, and volume unit.
- EDV must be greater than zero and ESV must be between zero and EDV.
- The result is a mathematical estimate from entered volumes, not a direct measurement by this page.
- Different imaging methods and measurement assumptions can produce different volume and EF values.
- The displayed context uses common LVEF bands and is not a diagnosis of heart failure or contractility.
- A clinician must interpret EF with symptoms, imaging quality, loading conditions, rhythm, valves, and the full record.
- The calculator does not estimate right-ventricular function, cardiac output, prognosis, or treatment response.
- Urgent chest pain, severe breathlessness, fainting, or blue lips require emergency local care rather than calculation.
Who uses this calculator?
- Students learning the relationship between EDV, ESV, stroke volume, and EF
- Readers checking the arithmetic behind a documented volume pair
- Clinicians or educators explaining why an EF percentage needs measurement context
When is it useful?
- Calculate stroke volume from two ventricular volume inputs.
- Convert the stroke volume fraction into an EF percentage.
- Show why an EF value should be read with its measurement method and clinical context.
Context and background
How health estimates should be read
Health calculators use measurements and population-level relationships to produce screening or planning estimates. They describe the supplied model; they do not diagnose, prescribe, or replace clinical judgment.
Many familiar health formulas began as practical ways to summarize measurements. Their limits matter as much as their output because individual bodies, medications, conditions, and professional standards vary.
Research and review
How this guide was researched
Researched by Hassan ALRowaie, Founder and editorial researcher at WorldCalculate.
This guide follows the live calculator's declared inputs, formula, worked example, assumptions, validation boundaries, and source-backed methodology. The review date describes editorial review of the calculator explanation; it is not a promise that external facts or rates remain current.
Ejection fraction expresses the proportion of ventricular filling volume ejected during a beat. WorldCalculate makes the EDV, ESV, stroke-volume, and percentage steps visible without turning a simple formula into a diagnosis.
What ejection fraction means
Ejection fraction is a fraction, reported as a percentage, that relates the volume ejected during systole to the volume present at end diastole.
It is commonly discussed for the left ventricle, but the measurement method and ventricle must be kept clear in any report.
The EDV and ESV inputs
End-diastolic volume is the selected volume before contraction, and end-systolic volume is the selected volume remaining after contraction.
Both values must describe the same measurement context. Mixing measurements from different methods or time points can create a number that has no clinical meaning.
Stroke volume first
Stroke volume is the difference between EDV and ESV. With 120 mL EDV and 48 mL ESV, stroke volume is 72 mL.
The calculator shows this intermediate value because it is the numerator of the EF fraction and a useful check on the arithmetic.
The ejection fraction formula
EF (%) = [(EDV − ESV) ÷ EDV] × 100. In the example, 72 ÷ 120 × 100 equals 60%.
The page rejects an ESV larger than EDV because that would produce an impossible negative ejected volume in this simple model.
Common EF context bands
Common heart-failure discussions describe values of 50% or more as preserved, 41–49% as mildly reduced or mid-range, and 40% or less as reduced. These labels are context, not a complete clinical interpretation.
Measurement technique, loading conditions, rhythm, valve disease, image quality, and the person’s symptoms all matter.
Why a formula cannot replace imaging
This calculator only derives a percentage from entered volumes. It does not measure chamber geometry, validate an echocardiogram, or decide whether the entered values are reliable.
A reported EF should be interpreted by the responsible clinician alongside the imaging report and the rest of the clinical picture.
Limits and safety
An EF percentage is not the same as cardiac output, blood pressure, exercise capacity, or an individual prognosis. A preserved EF does not rule out every form of heart failure.
Use urgent local or emergency services for acute chest pain, severe breathing difficulty, collapse, or rapidly worsening symptoms.
FAQs
Can EF exceed 100% in this calculator? No; ESV is constrained to zero through EDV. Does a normal-looking number guarantee a healthy heart? No. Can I use this to interpret a scan without the report? No; the measurement method and clinical context are essential.
Frequently asked questions
What is the Ejection Fraction Calculator?
Calculate stroke volume and left-ventricular ejection fraction from end-diastolic and end-systolic volumes, with the result kept separate from an echocardiography diagnosis.
What is the formula for the Ejection Fraction Calculator?
Stroke volume = EDV − ESV; ejection fraction (%) = [(EDV − ESV) ÷ EDV] × 100. The page calculates the volume ejected per beat and expresses it as a percentage of the end-diastolic volume. It checks that ESV is not greater than EDV and labels any clinical range as context rather than a diagnosis.
What do I need to use this calculator?
Enter End-diastolic volume (EDV), End-systolic volume (ESV), then choose Calculate.
What are the limits of this calculator?
EDV and ESV refer to the same ventricle, beat or measurement context, and volume unit. EDV must be greater than zero and ESV must be between zero and EDV. The result is a mathematical estimate from entered volumes, not a direct measurement by this page. Different imaging methods and measurement assumptions can produce different volume and EF values. The displayed context uses common LVEF bands and is not a diagnosis of heart failure or contractility. A clinician must interpret EF with symptoms, imaging quality, loading conditions, rhythm, valves, and the full record. The calculator does not estimate right-ventricular function, cardiac output, prognosis, or treatment response. Urgent chest pain, severe breathlessness, fainting, or blue lips require emergency local care rather than calculation.
Methodology
This calculator is part of the WorldCalculate library. Its formula, example, assumptions, input bounds, and output formatting follow the official methodology.
Use this calculator as part of a bigger plan
These WorldCalculate collections connect this tool with related questions while keeping each calculation separate and transparent.