Injury Severity Score Calculator

Estimate Injury Severity Score by choosing regional AIS values and summing the squares of the top three regions.

969.3K uses Updated · 2026-05-21 Runs locally · zero upload
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How to Use Injury Severity Score Calculator

The Injury Severity Score Calculator is built for the specific workflow behind this calculation, not as a generic number form. Use the left-side inputs to enter the values named in the labels, then read the primary result and supporting details in the right-side result panel.

  1. Prepare the value - Select an AIS value for each body region.
  2. Enter the measurement - Use 0 for no injury in that region.
  3. Check the calculation - The calculator sorts the regional scores and squares the top three.
  4. Read the output - If any region is AIS 6, the ISS is set to 75.

The Injury Severity Score Calculator updates in the browser, so you can revise one field and immediately see how the answer changes. If the result looks surprising, first check units, decimal placement, and whether the input represents the same definition used by the formula.

Formula & Theory - Injury Severity Score Calculator

The Injury Severity Score Calculator uses this calculation rule:

ISS = square of the three highest regional AIS scores, or 75 if any AIS is 6

ISS summarizes multiple injuries by emphasizing the three most severe body regions. Squaring increases the contribution of severe regional scores. The special AIS 6 rule reflects injuries considered maximal or unsurvivable in the scoring system.

Because this is a front-end calculator, the arithmetic happens locally in JavaScript. That makes the tool useful for quick review, teaching, and documentation support, but it also means the result is only as reliable as the values typed into the form. Pay special attention to denominators, unit conventions, and scoring definitions.

Assumptions and Limits

The Injury Severity Score Calculator follows a practical simplified implementation suitable for a web calculator. It does not validate source documents, replace formal scoring manuals, or adjust for every local protocol. For clinical calculators, confirm the output with qualified clinical judgment. For school or publication metrics, compare the result with the governing policy or database definition.

Use Cases for Injury Severity Score Calculator

The Injury Severity Score Calculator is most useful when you need a transparent calculation with visible inputs and a repeatable result. Common scenarios include:

  • Trauma registry abstraction - Turn regional AIS entries into a single ISS value for registry review.
  • Emergency medicine teaching - Show why the three worst regions dominate the score.
  • Comparing multisystem injury burden - Contrast patients with one severe region versus several moderate regions.
  • Quality review of coded AIS values - Check whether an AIS 6 code correctly forces ISS to 75.

Use the result as a starting point for review. When the number will be copied into a note, report, worksheet, or decision record, keep the original measurements nearby so the calculation can be checked later.

Frequently asked questions about Injury Severity Score Calculator

How accurate is the Injury Severity Score Calculator?

The Injury Severity Score Calculator is arithmetically accurate for the values entered, but interpretation depends on source data quality, units, and the rules used in your setting.

Does the Injury Severity Score Calculator replace professional judgment?

No. Use the result as a calculation aid and confirm clinical, academic, or institutional decisions with the appropriate professional standard.

Is my data stored?

No. All calculations happen in your browser; nothing is sent to a server.