Glasgow Coma Scale (GCS) Calculator
Choose the best observed response for each category. The calculator will return the total GCS score (3 to 15) and a quick interpretation.
Educational tool only. Always use clinical judgment and local protocols for patient care.
What is the Glasgow Coma Scale?
The Glasgow Coma Scale (GCS) is a standardized neurological scoring system used to assess a person’s level of consciousness after head injury or other causes of altered mental status. It combines three observations:
- Eye opening (E): 1 to 4 points
- Verbal response (V): 1 to 5 points
- Motor response (M): 1 to 6 points
These are added to produce a total score from 3 (deeply unresponsive) to 15 (fully alert).
How scoring works
Eye Opening (E)
- 4: Opens eyes spontaneously
- 3: Opens eyes to speech
- 2: Opens eyes to pain
- 1: No eye opening
Verbal Response (V)
- 5: Oriented and appropriate
- 4: Confused conversation
- 3: Inappropriate words
- 2: Incomprehensible sounds
- 1: No verbal response
Motor Response (M)
- 6: Obeys commands
- 5: Localizes pain
- 4: Withdraws to pain
- 3: Abnormal flexion
- 2: Extension
- 1: No motor response
Interpreting the total GCS score
While interpretation depends on context, a common framework is:
- 13–15: Mild impairment
- 9–12: Moderate impairment
- 8 or less: Severe impairment (often considered coma-level concern)
Clinical decisions should never rely on GCS alone. Trends over time, pupil findings, imaging, oxygenation, blood pressure, sedation status, intoxication, and baseline neurologic conditions are all important.
How to use this GCS score calculator
- Select one value for eye opening, verbal response, and motor response.
- Click Calculate GCS.
- Review the total score and interpretation shown below the form.
- Use the Reset button to start a new calculation.
Why serial GCS checks matter
A single score is helpful, but repeated assessments are often more clinically meaningful. A patient who drops from GCS 14 to 11 may be worsening, even though both values can occur in moderate-to-mild ranges depending on context. Always monitor trends and correlate with the full exam.
Important limitations
- Intubated patients: Verbal response may be untestable, and documentation commonly uses “T” notation.
- Sedation/paralytics: Medications can depress true neurologic responses.
- Language/hearing barriers: Communication factors can affect verbal scoring.
- Age and baseline disease: Pre-existing neurologic deficits can alter expected responses.
Quick FAQ
What is a normal GCS?
A score of 15 is generally considered normal consciousness.
What is the minimum and maximum score?
The minimum is 3 and the maximum is 15.
Is GCS only for trauma?
No. It is widely used in trauma, stroke, metabolic encephalopathy, infections, toxicology, and other causes of reduced consciousness.
Medical disclaimer: This page is for education and quick reference. It is not a substitute for emergency evaluation, diagnosis, or treatment by licensed clinicians.