Glasgow Coma Scale (GCS) Calculator
Select the best observed response in each category. This tool supports standard GCS and optional GCS-P (with pupil reactivity score).
What is the Glasgow Coma Scale?
The Glasgow Coma Scale (GCS) is a quick neurological scoring system used to assess level of consciousness after head injury, trauma, stroke, intoxication, or other acute brain-related illness. It standardizes communication by assigning points across three domains: eye opening, verbal response, and motor response.
A standard adult GCS score ranges from 3 to 15:
- 15 = fully alert (best responses in all categories)
- 3 = no eye, verbal, or motor response
How the GCS score is built
1) Eye Opening (E: 1-4)
- 4 = spontaneous
- 3 = to speech
- 2 = to pain
- 1 = none
2) Verbal Response (V: 1-5)
- 5 = oriented
- 4 = confused
- 3 = inappropriate words
- 2 = incomprehensible sounds
- 1 = none
3) Motor Response (M: 1-6)
- 6 = obeys commands
- 5 = localizes pain
- 4 = withdraws to pain
- 3 = abnormal flexion
- 2 = extension
- 1 = none
Interpretation ranges
| Total GCS | Typical Severity Band |
|---|---|
| 13-15 | Mild brain injury pattern |
| 9-12 | Moderate brain injury pattern |
| 3-8 | Severe brain injury pattern (critical zone) |
Using this glasgow coma scale calculator correctly
- Score the best observed response in each category.
- Document individual components as well as the total (for example, E3 V4 M6 = 13).
- If verbal response is not testable (intubated), document Vt rather than forcing a number.
- Trend scores over time; a changing GCS can be more important than a single measurement.
What is GCS-P?
GCS-P combines the Glasgow Coma Scale with pupil reactivity. It is calculated as:
GCS-P = GCS total - Pupil Reactivity Score (0-2)
This can add prognostic context in severe brain injury, especially when pupils are non-reactive.
Common charting examples
- E4 V5 M6 = 15 (fully alert)
- E2 V3 M5 = 10 (moderate impairment)
- E1 V1 M3 = 5 (severe impairment)
- E3 Vt M6 (verbal not testable; avoid numeric total)
Important limitations
The Glasgow Coma Scale is valuable, but it is not the whole neurological exam. Sedation, paralysis, intoxication, language barriers, hearing impairment, facial trauma, and intubation can affect scoring reliability. Always interpret GCS in full clinical context, including airway status, pupils, imaging, vitals, and serial exams.
Clinical safety note
This page is educational and not a substitute for clinical judgment. If there is concern for head injury, stroke, altered mental status, or deteriorating consciousness, seek urgent medical evaluation immediately.