Free tool
Tick the burned body regions for an adult or a child and get the estimated percent of total body surface area (TBSA), using the Rule of Nines values the NREMT EMT course teaches. An exam study aid, not for clinical use.
Built for NREMT EMTTick only the regions with second- or third-degree burns. Superficial (first-degree) burns are left out of TBSA.
Tick the burned regions.
Burn size is one of dozens of numbers the NREMT expects you to hold. Encodr keeps the adult and pediatric values on a spaced-repetition schedule, next to the rest of the trauma chapters.
Get started freeThe Rule of Nines gives a quick estimate of how much of the body surface is burned. In an adult the head is 9% (4.5% front and 4.5% back), the front of the torso is 18%, the back of the torso is 18%, each arm is 9% (4.5% front and 4.5% back), each leg is 18% (9% front and 9% back) and the perineum is 1%. That adds to 100%.
A child has a proportionally larger head and smaller legs. In the pediatric version the head is 18% (9% front and 9% back) and each leg is 13.5% (6.75% front and 6.75% back). The torso, the arms and the perineum keep the adult values, and the total is still 100%. For children, the palm of the patient's hand, not including the fingers, is about 1% of TBSA, which helps with small or scattered burns.
Only second-degree (partial-thickness) and third-degree (full-thickness) burns count. Superficial redness such as a mild sunburn is left out of the estimate.
Worked example: an adult has blisters across the entire front of the torso and the front of the left arm. That is 18 + 4.5 = 22.5% TBSA. A child with burns over the entire head counts 18%, not 9%. The context, including when to consider a burn center, is in the Rule of Nines for burns, and the whole course is in the free NREMT EMT deck.
This tool is a study aid for exam practice. It is not for clinical decisions: your EMT program, state protocols and medical director decide how burns are assessed and treated.
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