Charlson Comorbidity Index Calculator

Calculate a Charlson comorbidity score from age and weighted comorbidity items.

969.6K uses Updated · 2026-05-25 Runs locally · zero upload
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How to Use the Charlson Comorbidity Index Calculator

Enter age and check each comorbidity that applies. Conditions carry fixed weights, with higher weights for conditions such as metastatic tumor or AIDS.

The calculator adds condition points and age points, then shows the total score, subtotals, and a modeled one-year risk cue. Higher scores indicate greater comorbidity burden.

Formula and Method - Charlson Comorbidity Index Calculator

Charlson total = sum of comorbidity weights + age points

The Charlson index assigns 1, 2, 3, or 6 points to specific conditions to summarize long-term prognosis burden. Age adds points because older age independently increases risk. The displayed one-year risk cue is a simplified model, not a formal prognosis.

Use Cases for the Charlson Comorbidity Index Calculator

  • Describing baseline comorbidity burden in clinical research.
  • Comparing disease complexity across patients in case review.
  • Creating a transparent comorbidity score for risk adjustment work.

Frequently asked questions about Charlson Comorbidity Index Calculator

How are age points assigned?

Below 50 adds 0; then points rise by decade, capped at 4 in this implementation.

Can one condition be counted twice?

No. Each Charlson item should generally be counted once if present.

Can the modeled risk be used as a prognosis?

Not by itself. Prognosis requires diagnosis, severity, treatment, and clinician judgment.