CURB-65 Score Calculator
Enter five clinical criteria to calculate the CURB-65 score and estimate 30-day mortality risk for community-acquired pneumonia.
For educational use only. Not a substitute for clinical judgment. All pneumonia management decisions must be made by qualified clinicians based on full patient assessment.
CURB-65 Criteria
Five clinical criteria — each present scores 1 point (maximum 5).
New acute confusion or disorientation — not pre-existing dementia or baseline cognitive impairment.
Scores 1 point if urea > 7 mmol/L (BUN > 19.6 mg/dL). Leave blank to select manually below.
Entering a numeric value overrides the manual selection above.
Scores 1 point if ≥ 30 breaths per minute.
Scores 1 point if systolic < 90 mmHg or diastolic ≤ 60 mmHg.
Scores 1 point if the patient is 65 years of age or older.
Enter the clinical criteria
and click Calculate.
CURB-65 Score
Criterion Breakdown
Management Guidance
CURB-65 Criteria & Scoring Reference
| Letter | Criterion | Threshold | Points |
|---|---|---|---|
| C | Confusion | New acute confusion | 1 |
| U | Urea | > 7 mmol/L | 1 |
| R | Respiratory Rate | ≥ 30 breaths/min | 1 |
| B | Blood Pressure | Systolic < 90 or Diastolic ≤ 60 mmHg | 1 |
| 65 | Age | ≥ 65 years | 1 |
| Total (maximum) | 5 | ||
Score Interpretation & 30-Day Mortality
Summary
Enter five clinical criteria to calculate the CURB-65 score and estimate 30-day mortality risk for community-acquired pneumonia.
How it works
- Assess whether the patient has new confusion or disorientation (not pre-existing dementia).
- Enter the blood urea nitrogen (BUN) value in mmol/L or select whether it exceeds 7 mmol/L.
- Enter the respiratory rate; a rate of 30 or more per minute scores 1 point.
- Enter systolic and diastolic blood pressure; hypotension (systolic < 90 or diastolic ≤ 60) scores 1 point.
- Indicate whether the patient is aged 65 or older.
- The calculator totals the five binary criteria and displays the 30-day mortality risk category and hospitalization guidance.
Use cases
- Determine outpatient versus inpatient management for adults with community-acquired pneumonia.
- Triage patients presenting to the emergency department with suspected pneumonia.
- Support clinical decision-making for ICU referral in severely ill patients.
- Communicate pneumonia severity to consulting teams using a standardized score.
- Facilitate early discharge planning for low-risk pneumonia patients.
- Use as an educational tool in medical training for pneumonia management.
- Apply as a complement to clinical judgment and chest imaging findings.
- Track severity changes in patients with evolving pneumonia on serial assessments.