NYHA Functional Classification Calculator

New York Heart Association (NYHA) functional class for heart-failure symptom severity (I–IV).

For educational and clinical reference. Not a substitute for medical judgment. See the medical disclaimer.
NYHA Class
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Interpretation
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References

  1. The Criteria Committee of the New York Heart Association. Nomenclature and Criteria for Diagnosis of Diseases of the Heart and Great Vessels. 9th ed. Boston: Little, Brown & Co; 1994:253-256.

How to use

  1. Select the description that best matches the patient’s current symptomatic limitation.
  2. The NYHA functional class (I–IV) updates instantly.
  3. Reassess after treatment changes — NYHA class can improve or worsen over time.

Frequently asked questions

What is the NYHA classification?

The New York Heart Association functional classification grades heart-failure symptom severity from Class I (no limitation) to Class IV (symptoms at rest).

How does NYHA differ from ACC/AHA stages?

ACC/AHA stages (A–D) describe disease progression and are not reversible; NYHA class describes current functional status and can change with treatment.

Why does NYHA class matter?

It guides therapy intensity, eligibility for device/transplant referral, and is a strong predictor of mortality and hospitalization.

Is NYHA class subjective?

Yes — it relies on clinician assessment of reported symptoms, which contributes to inter-observer variability; objective measures (e.g., peak VO₂) can supplement it.

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