CURB-65 Calculator

Score CURB-65 criteria for community-acquired pneumonia severity using confusion, urea, respirations, blood pressure, and age.

861.5K uses Updated · 2026-05-21 Runs locally · zero upload
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How to Use CURB-65 Calculator

The CURB-65 Calculator is built for the specific workflow behind this calculation, not as a generic number form. Use the left-side inputs to enter the values named in the labels, then read the primary result and supporting details in the right-side result panel.

  1. Prepare the value - Check confusion if present.
  2. Enter the measurement - Enter urea, respiratory rate, systolic pressure, diastolic pressure, and age.
  3. Check the calculation - The calculator marks each criterion as yes or no.
  4. Read the output - Read the total score and low, moderate, or high risk band.

The CURB-65 Calculator updates in the browser, so you can revise one field and immediately see how the answer changes. If the result looks surprising, first check units, decimal placement, and whether the input represents the same definition used by the formula.

Formula & Theory - CURB-65 Calculator

The CURB-65 Calculator uses this calculation rule:

CURB-65 = confusion + urea > 7 + respiratory rate >= 30 + low blood pressure + age >= 65

CURB-65 is intentionally simple: each satisfied criterion adds one point. The calculator evaluates numeric thresholds directly, including systolic pressure below 90 or diastolic pressure at or below 60 for the blood pressure point.

Because this is a front-end calculator, the arithmetic happens locally in JavaScript. That makes the tool useful for quick review, teaching, and documentation support, but it also means the result is only as reliable as the values typed into the form. Pay special attention to denominators, unit conventions, and scoring definitions.

Assumptions and Limits

The CURB-65 Calculator follows a practical simplified implementation suitable for a web calculator. It does not validate source documents, replace formal scoring manuals, or adjust for every local protocol. For clinical calculators, confirm the output with qualified clinical judgment. For school or publication metrics, compare the result with the governing policy or database definition.

Use Cases for CURB-65 Calculator

The CURB-65 Calculator is most useful when you need a transparent calculation with visible inputs and a repeatable result. Common scenarios include:

  • Community pneumonia triage teaching - Review the five CURB-65 criteria in a compact checklist.
  • Emergency department checklist support - Quickly identify which pneumonia severity points are present.
  • Audit of documented criteria - Compare recorded vitals and labs with the score actually assigned.
  • Patient severity explanation - Use the simple point count to explain why closer monitoring may be considered.

Use the result as a starting point for review. When the number will be copied into a note, report, worksheet, or decision record, keep the original measurements nearby so the calculation can be checked later.

Frequently asked questions about CURB-65 Calculator

How accurate is the CURB-65 Calculator?

The CURB-65 Calculator is arithmetically accurate for the values entered, but interpretation depends on source data quality, units, and the rules used in your setting.

Does the CURB-65 Calculator replace professional judgment?

No. Use the result as a calculation aid and confirm clinical, academic, or institutional decisions with the appropriate professional standard.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.