Glasgow Coma Scale (GCS)
Free Glasgow Coma Scale calculator with separate eye, verbal, and motor scores, live GCS total, interpretation, and non-testable component guidance.
Reviewed by Zaka Ahmed, MD Clinical reference · 5 min read
Glasgow Coma Scale
Select the best observed response in each domain. The result updates only after all three components are documented.
Educational use only. Use the observed component scores and document any domain that is not testable. Do not infer an airway, intervention, or individual prognosis from the total alone.
Clinical notes & interpretation Scoring guidance, pitfalls, FAQs, and references
The Glasgow Coma Scale records the best eye, verbal, and motor responses as E + V + M for a total of 3–15.
- → Always communicate the components — GCS 9 as E2 V2 M5 carries more information than “GCS 9.”
- → Record a non-testable component instead of inventing a number when intubation, paralysis, language, or local injury prevents testing.
The Glasgow Coma Scale (GCS) is a compact description of consciousness based on three independently observed responses. This calculator preserves those components, requires each one to be selected, and reports the conventional total without turning the score into an automated airway or prognosis decision.
How to report the score
Report the total and components together: GCS 11 = E3 V3 M5. Components make serial change interpretable and prevent two very different examinations from being collapsed into the same total. If a component is not testable, state the reason in words rather than substituting an arbitrary 1.
Common shorthand, with limits
Totals of 13–15, 9–12, and 3–8 are often described as mild, moderate, and severe impairment in trauma literature. These bands are shorthand, not diagnoses or stand-alone treatment thresholds. Sedation, intoxication, aphasia, hearing loss, intubation, and focal motor injury can all distort a total.