CURB-65 Calculator is a useful tool when managing a patient with a community-acquired pneumonia (CAP). It takes into account five easily available parameters and helps the doctor decide whether the patient should be admitted to the hospital. Moreover, the CURB-65 score stratifies the patient risk of death!

Continue reading to find out what are the components of CURB-65 criteria and what does it tell us about pneumonia severity. You may albo be interested in other pulmonary calculators, e.g., smoking recovery calculator.

Diseases of the lungs

Lungs are the primary organs of the human respiratory system. You cannot live without them! Testing its anatomy bases on X-Ray and computed tomography. It's function is usually checked by spirometry and pulmonary plethysmography. Thanks to them you can measure, e.g. vital capacity and lung capacity.

Due to the fact that with respiration we inhale not only fresh air but also pathogens and toxic substances lungs are the place of frequent diseases. Lung cancer is the most common cancer in adults, pulmonary embolism is a life-threatening condition happening often in immobilized patients and pneumonia is common and significant problem, especially in hospitalized patients.

What is Community-Acquired Pneumonia?

CAP or community-acquired pneumonia is the inflammatory process which takes place in the lungs, in a person who has little contact with the healthcare system. On the other hand, there is a HAP or hospital-acquired pneumonia, which by the definition, is any pneumonia in a patient who is in the hospital for at least 48–72 hours. This distinction is crucial, because it reflects the proceedings - there are different pathogens that cause pneumonia in those two situations.

What are the CURB-65 criteria?

In 2003, a group of scientists from Nottingham's Respiratory Infection Research Group published a paper in Thorax. They described a scale they had prepared and validated in the big group of 1068 patients from UK, New Zealand and the Netherlands with community-acquired pneumonia. The CURB-65 score enabled to stratify patients according to the risk of mortality and choose the group patients who should be treated at the hospital and the group which can be treated at home.

CURB-65 calculator

The CURB-65 score is an acronym and consists of five simple measurements out of each of which patient may receive zero or one point. These measurements are:

  • C - Confusion (1 point if the patient has a confusion of new onset),

  • U - Blood Urea Nitrogen (1 point if blood urea nitrogen concentration greater than 19 mg/dl),

  • R - Respiratory Rate (1 point if the respiratory rate is 30 breaths per minute or greater),

  • B - Blood Pressure (1 point if systolic blood pressure is fewer than 90 mmHg or diastolic blood pressure is fewer than 60 mmHg),

  • 65 - age (1 point if the patient is 65 years old or older).

The CURB-65 score is the sum of the score obtained from the five above measurements and takes on values from 0 to 5. Thanks to our CURB-65 calculator you can calculate it for yourself in a few simple steps!

Check out our other health calculators, which use simple clinical data and predict patient outcomes such as Revised Trauma Score calculator or Centor Score calculator!

Pneumonia admission criteria

The result of CURB score reflects pneumonia severity and patient's probability of death. The higher the score the poorer the prognosis and the lower the chances of survival.

CURB-65 Mortality
0 0.6%
1 2.7%
2 6.8%
3 14.0%
4 - 5 27.8%

The CURB-65 criteria are also often called pneumonia admission criteria, because the result of CURB score tell the doctor if he should admit the patient to the hospital or can treat the patient in an outpatient clinic.

  • CURB-65: 0 or 1 - treat outpatient
  • CURB-65: 2 - consider hospitalization
  • CURB-65: 3, 4 or 5 - hospitalization required

In other words - patient should be admitted to the hospital if the probability of death is more than 7%.

Łukasz Białek, MD
Blood Urea Nitrogen
Respiratory Rate
per minute
Systolic Blood Pressure
Diastolic Blood Pressure
CURB-65 score
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