CURB-65 Calculator

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CURB-65 needs a urea or BUN result. CRB-65 drops the urea criterion for primary-care or pre-lab settings, giving a 0 to 4 score.
Raw vitals mode applies the clinical thresholds for you. Toggle mode lets you tick each criterion directly if you have already assessed it.
New mental confusion, defined as an Abbreviated Mental Test score of 8 or less, or new disorientation to person, place, or time.
Age 65 or older scores one point.
yrs
Choose BUN in mg/dL or serum urea in mmol/L. The point is scored above 19 mg/dL BUN (about 7 mmol/L urea). Ignored in CRB-65.
A rate of 30 breaths per minute or higher scores one point.
/min
Systolic below 90 mmHg scores the blood-pressure point.
mmHg
Diastolic of 60 mmHg or lower also scores the blood-pressure point.
mmHg
ScoreHigh risk: admit, consider ICU
3pts
30-day mortality (approx.)0.2%
Risk bandHigh risk
Suggested care settingHospital admission; assess for intensive care, especially at a score of 4 or 5.
Criteria metUrea, Respiratory rate, Age 65+
3 pts
Low (0-1)<1Intermediate (2)1-2High (3-5)2+

CURB-65 score 3 of 5: high risk, about 17.0% 30-day mortality.

  • Hospital admission; assess for intensive care, especially at a score of 4 or 5.
  • Criteria met: Urea, Respiratory rate, Age 65+.
  • Each present criterion adds one point: Confusion, Urea, Respiratory rate, Blood pressure, and age 65 or older.
  • The score is one input into disposition; oxygen saturation, comorbidities, and social factors also matter.

Next stepConfirm each criterion against the patient and combine the score with clinical judgement and local guidelines.

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