Injury Severity Score (ISS) Calculator

Injury Severity Score (ISS) — anatomical trauma severity from AIS body-region grades (0–75).

For educational and clinical reference. Not a substitute for medical judgment. See the medical disclaimer.
Injury Severity Score
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Interpretation
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References

  1. Baker SP, O’Neill B, Haddon W, Long WB. The Injury Severity Score: a method for describing patients with multiple injuries and evaluating emergency care. J Trauma. 1974;14(3):187-196.

How to use

  1. Select the highest AIS grade (0–6) for each of the six body regions.
  2. The ISS (sum of squares of the three highest, or 75 if any region is 6) updates instantly.
  3. An ISS > 15 defines major trauma.

Frequently asked questions

What is the Injury Severity Score?

The ISS summarises overall anatomical trauma severity: the sum of the squares of the highest Abbreviated Injury Scale (AIS) grade in the three most severely injured of six body regions.

What ISS defines major trauma?

An ISS > 15 is the conventional definition of major (polytrauma) and is associated with markedly increased mortality.

Why does any AIS of 6 give ISS 75?

An AIS of 6 denotes an essentially unsurvivable injury, so the ISS is automatically set to its maximum value of 75.

What are the six ISS body regions?

Head/neck, face, chest, abdomen/pelvic contents, extremities/pelvic girdle, and external/skin.

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