CURB-65 Calculator (Pneumonia Severity)
CURB-65 = Confusion + Urea>7 + RR≥30 + BP<90/60 + Age≥65. Lim 2003 Thorax. Predicts 30-day pneumonia mortality.
Result
- Confusion (+1)0
- Urea > 7 mmol/L (+1)0
- RR ≥ 30 (+1)0
- BP < 90/60 (+1)0
- Age ≥ 65 (+1)0
- Total0
- 30-day mortality0.7%
- DispositionOutpatient — low mortality.
Step-by-step
- Sum 5 binary criteria: max 5.
- Score = 0 + 0 + 0 + 0 + 0 = 0.
- 30-day mortality (Lim 2003): 0.7%.
How to use this calculator
- Assess each criterion at presentation.
- Read score + 30-day mortality estimate.
- Use alongside oxygenation + clinical judgment for admission decisions.
About this calculator
CURB-65 stratifies community-acquired pneumonia (CAP) by 30-day mortality and informs admission decisions. Source: Lim WS et al., "Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study." Thorax 2003;58(5):377-82. Validated in 1,068 patients from 3 countries. Mortality bands: 0 (0.7%), 1 (2.1%), 2 (9.2%), 3 (14.5%), 4 (40%), 5 (57%). BTS/IDSA guidelines: score 0-1 outpatient, 2 ward (short stay), 3-5 inpatient (ICU consider ≥3-4). Variant CRB-65 omits urea (no labs needed; useful in primary care). **Not medical advice — clinical context (oxygenation, comorbidities) drives admission decisions.**