Emergency Medicine · Critical Care · Surgery

Burn Total Body Surface Area (Wallace Rule of Nines, Adult) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Head and neck burn (% TBSA)

Anterior trunk burn (% TBSA)

Posterior trunk burn (% TBSA)

Right arm burn (% TBSA)

Left arm burn (% TBSA)

Right leg burn (% TBSA)

Left leg burn (% TBSA)

Perineum burn (% TBSA)

Result

Complete all required inputs to calculate the score.

Formula inputs

Head and neck burn (% TBSA)Accepted range: 0 to 9
Anterior trunk burn (% TBSA)Accepted range: 0 to 9
Posterior trunk burn (% TBSA)Accepted range: 0 to 9
Right arm burn (% TBSA)Accepted range: 0 to 9
Left arm burn (% TBSA)Accepted range: 0 to 9
Right leg burn (% TBSA)Accepted range: 0 to 18
Left leg burn (% TBSA)Accepted range: 0 to 18
Perineum burn (% TBSA)Accepted range: 0 to 1

Primary source

Wallace AB. The exposure treatment of burns. Lancet. DOI: 10.1016/S0140-6736(00)55578-2. PMID: 14884765. Scope: adult Wallace rule of nines assigns 9% TBSA each to head/neck, anterior trunk, posterior trunk, and each arm; 18% to each leg; 1% to perineum; total burn TBSA is the sum of burned percentages by region. (1951)

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