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Rule of Nines Burn TBSA Calculator

Adult TBSA from body regions burned (Rule of Nines).

Calculates total body surface area (TBSA) burned in an adult using the Rule of Nines from whether each standard region is fully involved.

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Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Head 9%, each arm 9%, each leg 18%, anterior trunk 18%, posterior trunk 18%, perineum 1%

In depth

Calculates total body surface area (TBSA) burned in an adult using the Rule of Nines from whether each standard region is fully involved.