Free PSI Calculator | Pneumonia Severity Index

The Pneumonia Severity Index (PSI), also known as the PORT score, is a clinically validated prediction rule used to estimate 30‑day mortality risk in adults with community‑acquired pneumonia (CAP). This free PSI/PORT score calculator offers physicians a fast community‑acquired pneumonia risk assessment, calculates the patient’s PSI score, and provides a CAP mortality assessment together with a clear hospitalization recommendation based on the current pneumonia admission criteria. By synthesizing demographic, clinical, and laboratory data, the tool supports objective decision‑making regarding treatment setting and resource allocation.

Accurate risk stratification in CAP is critical not only for reducing mortality and improving survival but also for controlling healthcare costs and enhancing patient satisfaction. Research indicates that approximately 91% of CAP patients treated as out‑patients report being satisfied with their care, compared with only 79% of those who are hospitalized. Using a structured scoring system such as the PSI helps clinicians avoid unnecessary admissions while ensuring that high‑risk patients receive appropriate inpatient monitoring.

How the PSI Calculator Works

Using the calculator is straightforward: the user selects the patient’s sex and age, and then answers a series of yes/no questions grouped into three categories. The categories cover patient characteristics (8 items), physical examination findings (6 items), and laboratory values (6 items). Each positive finding contributes a predefined number of points; the tool instantly totals them and returns the overall score, risk class, predicted mortality, and an admission suggestion.

PSI Scoring Criteria

The points assigned for each variable are listed in the following tables. Age is scored at 1 point per year, and female sex subtracts 10 points from the total.

Patient Demographics & Comorbidities

Variable	Condition	Points
Sex	Male	0
	Female	–10
Age	Each year of age	+1 per year
Nursing home resident	Yes	10
Chronic renal disease	Present	10
Cerebrovascular disease	Present	10
Liver disease (e.g., fibrosis)	Present	20
Neoplasm	Present	30
Congestive heart failure	Present	10

Physical Examination Findings

Variable	Criterion	Points
Altered mental status	Observed	20
Pleural effusion on chest X‑ray	Visible	10
Respiratory rate	≥30 breaths/min	20
Pulse	≥125 bpm	10
Systolic blood pressure	<90 mmHg	20
Temperature	<35°C or >39.9°C (<95°F or >103.8°F)	15

Laboratory & Arterial Blood Gas Values

Variable	Threshold	Points
Blood urea nitrogen (BUN)	≥30 mg/dL (≥11 mmol/L)	20
Hematocrit	<30%	10
Serum sodium (Na)	<130 mmol/L (130 mEq/L)	20
Glucose	≥250 mg/dL (≥14 mmol/L)	10
Arterial pH	<7.35	30
Arterial pO₂	<60 mmHg (<8 kPa)	10

Interpreting the Results

Once all items are answered, the total PSI score is computed. This total corresponds to one of five risk classes (I through V), each associated with a progressively higher predicted mortality rate. Based on the class, the calculator offers an evidence‑based suggestion regarding hospitalization. Generally, low‑risk patients (classes I–II) are candidates for outpatient management, those in class III may need a brief observation period or an individualized decision, and high‑risk patients (classes IV–V) typically require inpatient care.

Important Caveat

While the PSI calculator delivers a rapid, objective risk estimate, it is designed as a decision‑support tool for healthcare professionals. It should never replace a comprehensive physician assessment, and clinical judgment must always be applied when making treatment and admission decisions.