CURB-65 Pneumonia Severity Calculator

CURB-65 estimates pneumonia mortality and guides admission decisions. 0–1 outpatient often safe; 2 admit; ≥3 ICU evaluation.

CURB-65 Score

Confusion (new onset)

Urea (BUN) >19 mg/dL (>7 mmol/L)

Respiratory rate ≥30/min

Blood pressure (SBP <90 OR DBP ≤60)

Age ≥65

Interpretation (30-day mortality)

0: 0.6% — outpatient
1: 2.7% — outpatient (consider)
2: 6.8% — admit ward
3: 14.0% — admit, consider ICU
4–5: 27.8% — ICU evaluation

Source: Lim WS et al. Defining community acquired pneumonia severity. Thorax. 2003;58(5):377-82.

Medical disclaimer: This tool provides educational information for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your individual situation with a qualified healthcare provider.

Frequently asked questions

Is CRB-65 the same as CURB-65?

CRB-65 omits Urea — used in primary care without lab access. Slightly less sensitive but useful for triage.

Does CURB-65 work for hospital-acquired pneumonia?

It was validated for community-acquired pneumonia. HAP/VAP severity uses different scoring (e.g., IDSA criteria).

Last reviewed: May 10, 2026 by iMedic Medical Editorial Team. Our editorial process.