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Calculator: CURB-65 pneumonia severity score

Calculator: CURB-65 pneumonia severity score


Confusion* (1 point)

Urea >20 mg/dL (7 mmol/L) (1 point)

Respiratory rate ≥30 breaths per minute (1 point)

Low systolic (<90 mmHg) or diastolic (≤60 mmHg) Blood pressure (1 point)

Age ≥65 years (1 point)

Important: Inputs must be complete to perform calculation.

Total criteria point count:


CURB-65 score

0 to 1 point: Low severity (risk of death <3%)
2 points: Moderate severity (risk of death 9%)
3 to 5 points: High severity (risk of death 15 to 40%)


*Defined as an Abbreviated Mental Test Score ≤8 or new disorientation to person, place, or time.
¶Urea is blood urea nitrogen [BUN], expressed in mg/dL or serum urea concentration, expressed in mmol/L.
For guidance regarding the use of the CURB-65 severity score to aid with the decision of the appropriate site of care for adults with community-acquired pneumonia, refer to the UpToDate topic review on this subject.

Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

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All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

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