The rule of nines is a tool used to estimate a burn's percentage of your total skin. It divides your body into sections by multiples of 9% each.

The extent of a burn is expressed as the total percentage of body surface area (TBSA) affected by the injury. Accurate estimation of the TBSA of a burn is essential to guide management.

While doctors will perform more thorough examinations for burn estimation, they can use the rule of nines to quickly assess a person and start recommending treatment centers and interventions to ...