General and clinical
Glasgow Coma Scale (GCS)
The Glasgow Coma Scale scores eye, verbal and motor responses to describe a person’s level of consciousness in one number between 3 and 15. It is recorded as three components, not just a total.
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This calculator is provided for reference and education. It does not replace clinical assessment, examination, current guidelines, local protocol, or professional judgment. Verify every result before acting on it. Nirogix accepts no liability for clinical decisions made using this tool.
The formula
- GCS = eye (1–4) + verbal (1–5) + motor (1–6)
- Range 3 to 15
Worked example
E3 V4 M5 = 12, a moderate impairment of consciousness
When to use it
- Head injury assessment and serial neurological observation
- Any acute change in consciousness
And when not to
- A component that cannot be tested, whether intubated, swollen eyes or aphasia, is recorded as untestable rather than as 1.
- Always record the components. "GCS 8" alone loses the information that matters clinically.
- The pediatric scale differs for the verbal component in pre-verbal children.
References
- Assessment of coma and impaired consciousness — Teasdale G & Jennett B, The Lancet, 1974
- The Glasgow Coma Scale at 40 years — Teasdale G et al., Lancet Neurology, 2014
Last reviewed 07/09/2026.
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