What is a normal ejection fraction?

The ACC/AHA classifies a normal left-ventricular EF as ≥55%. Values of 41–54% are mildly reduced, 30–40% moderately reduced, and below 30% severely reduced.

What units should I use for EDV and ESV?

Both values must be in the same unit — typically milliliters (mL). The EF percentage is unit-independent because it is a ratio.

Can this tool diagnose heart failure?

No. This tool is a calculation aid only. Heart failure diagnosis requires clinical evaluation by a qualified physician together with imaging, symptoms, and other tests.

Why must EDV be greater than ESV?

Physiologically, the heart ejects a portion of blood with each beat, so the end-diastolic (full) volume must always exceed the end-systolic (empty) volume. If ESV ≥ EDV, the input values are physiologically invalid.

What is stroke volume?

Stroke volume (SV) is the amount of blood ejected per beat: SV = EDV − ESV. For example, EDV 120 mL and ESV 50 mL gives SV 70 mL and EF 58%.

Ejection Fraction Calculator

Name: Ejection Fraction Calculator
Availability: InStock
Author: Nham Vu

Enter end-diastolic and end-systolic volumes to calculate cardiac ejection fraction with clinical classification.

Enter Ventricular Volumes

End-Diastolic Volume (EDV)

End-Systolic Volume (ESV)

Formula: EF (%) = (EDV − ESV) ÷ EDV × 100

Result

Enter volumes and press Calculate.

EF Classification Reference (ACC/AHA)

EF Range	Classification	Interpretation
≥ 55%	Normal	Preserved systolic function
41–54%	Mildly Reduced	HFmrEF — borderline systolic dysfunction
30–40%	Moderately Reduced	Significant systolic dysfunction
< 30%	Severely Reduced	Severe systolic dysfunction (HFrEF)

Reference: 2022 ACC/AHA/HFSA Guideline for the Management of Heart Failure. This tool is a calculation aid only — not a diagnostic instrument.

Summary

Enter end-diastolic and end-systolic volumes to calculate cardiac ejection fraction with clinical classification.

How it works

Enter the end-diastolic volume (EDV) — the volume of blood in the ventricle before contraction.
Enter the end-systolic volume (ESV) — the volume remaining after contraction.
The calculator applies EF = (EDV − ESV) / EDV × 100%.
The result is classified using ACC/AHA thresholds: normal (≥55%), mildly reduced (41–54%), moderately reduced (30–40%), or severely reduced (<30%).
Stroke volume (EDV − ESV) is shown alongside EF for additional context.

Use cases

Verify echocardiogram EF values at the bedside.
Educational exercises for cardiology students learning hemodynamics.
Cross-check EF derived from MUGA scans or cardiac MRI measurements.
Quickly assess systolic function category from documented volumes.
Research or audit tool for batch-checking documented EDV/ESV pairs.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu