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Revised Baux Score Calculator

Enter patient age, % total body surface area burned and whether an inhalation injury is present to get the Revised Baux score.

How it is calculated

The score is a simple sum: score = age + %TBSA + 17 × I. age is the patient's age in years, %TBSA is the percentage of total body surface area burned (30 for 30%), and I is 1 if an inhalation injury is present and 0 if not. The inhalation field accepts yes or no; anything other than yes counts as no. Age cannot be negative and TBSA must be between 0 and 100. The result is a whole-number score with no units. The tool does not convert the score to a percentage risk, because that needs published outcome tables or a local model that is not built in.

Worked example

A 45-year-old has burns over 30% of the body surface and an inhalation injury. Age plus TBSA: 45 + 30 = 75. Inhalation injury adds 17: 75 + 17 = 92. Without the inhalation injury the same patient would score 75, so the 17-point addition is the entire difference.

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Common mistakes

  • Entering TBSA as a fraction (0.3) rather than a percent (30), which understates the score by almost the full burn component.
  • Entering the age in months or days for infants. The formula uses years, so a 6-month-old is 0.5.
  • Forgetting to switch inhalation to yes when it is present, or turning it on for a simple smoke exposure without a documented injury.
  • Reading the score as a percentage chance of death. It is a points total, and the same total can mean different things in different burn centers.
  • Using the original Baux score and this one interchangeably; the revised version adds the 17 points, so values are not comparable.

About this calculator

This calculator applies the Revised Baux Score, a bedside formula used in burn units to estimate mortality risk: score = age (years) + %TBSA burned + 17 (if an inhalation injury is present). It extends the original Baux score, which was simply age plus percent total body surface area burned, by adding a fixed penalty for inhalation injury after research showed it independently worsens outcomes.

Burn surgeons and emergency physicians use the Revised Baux score on admission to triage severity, guide conversations about prognosis with patients and families, and benchmark outcomes across burn centers — higher scores correlate with steeply rising mortality risk, especially above roughly 100–130 points.

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