Pneumonia Severity Index (PSI/PORT) Calculator

Pneumonia Severity Index (PSI/PORT) risk class I–V for community-acquired pneumonia.

For educational and clinical reference. Not a substitute for medical judgment. See the medical disclaimer.
PSI class
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Risk / disposition
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References

  1. Fine MJ, Auble TE, Yealy DM, et al. A prediction rule to identify low-risk patients with community-acquired pneumonia. N Engl J Med. 1997;336(4):243-250.

How to use

  1. Enter age and sex, then tick each comorbidity, exam, and laboratory finding present.
  2. The PSI points and risk class (I–V) with 30-day mortality update instantly.
  3. Class I–II patients are typical outpatient candidates; IV–V need admission.

Frequently asked questions

What is the PSI / PORT score?

The Pneumonia Severity Index stratifies community-acquired pneumonia into risk classes I–V to guide the inpatient vs outpatient decision.

How are PSI classes interpreted?

Class I–II low risk (outpatient candidates), III intermediate (brief observation), IV–V high risk (inpatient, consider ICU for V).

How is Class I assigned?

By step 1: patients ≤ 50 years with no listed comorbidity and no examination abnormality are Class I without point calculation.

PSI vs CURB-65?

PSI is more granular and better identifies low-risk patients; CURB-65 is simpler. Both support, but do not replace, clinical judgment and social factors.

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