Injury Severity Score (ISS) Calculator
Calculate the Injury Severity Score for trauma patients based on Abbreviated Injury Scale (AIS) scores. Assess trauma severity across different body regions.
Step 1: AIS Scores by Body Region
Abbreviated Injury Scale (AIS)
AIS scores range from 0 (no injury) to 6 (maximum injury, untreatable). ISS is calculated by taking the three highest AIS scores from different body regions, squaring them, and summing them.
Step 2: Patient Information
About ISS Calculation
The Injury Severity Score ranges from 0 to 75. If any AIS score is 6 (maximum injury), the ISS is automatically 75. An ISS > 15 is generally considered major trauma.
Injury Severity Score Results
Injury Severity Score
Injury Severity Classification
| ISS Range | Severity Classification | Mortality Risk | Typical Hospital Stay |
|---|
AIS Scores by Body Region
ISS Calculation Formula
ISS = (AIS₁)² + (AIS₂)² + (AIS₃)²
To calculate ISS: Identify the three highest AIS scores from different body regions, square each value, and sum them. Maximum ISS is 75 (if any AIS = 6).
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