Glasgow Coma Scale Calculator
Score level of consciousness using the Glasgow Coma Scale (eye, verbal, motor responses). Enter values for instant results with step-by-step formulas.
Formula
GCS = Eye Response (1-4) + Verbal Response (1-5) + Motor Response (1-6)
The total GCS score ranges from 3 (deep coma) to 15 (fully alert). Each component is scored independently: Eye opening assesses arousal, Verbal response assesses higher cortical function, and Motor response assesses brainstem and spinal cord function. GCS ≤ 8 generally indicates need for intubation.
Worked Examples
Example 1: Mild TBI Assessment
Problem: Patient after a fall. Opens eyes spontaneously (E4), is confused about location (V4), obeys commands (M6).
Solution: Eye: 4 (Spontaneous)\nVerbal: 4 (Confused)\nMotor: 6 (Obeys commands)\nTotal GCS = 4 + 4 + 6 = 14\nSeverity: Mild (13-15)\nIntubation: Not indicated
Result: GCS 14 (E4V4M6) — Mild TBI, standard monitoring
Example 2: Severe TBI Assessment
Problem: Unresponsive patient. No eye opening (E1), incomprehensible sounds (V2), abnormal flexion to pain (M3).
Solution: Eye: 1 (None)\nVerbal: 2 (Incomprehensible)\nMotor: 3 (Abnormal flexion)\nTotal GCS = 1 + 2 + 3 = 6\nSeverity: Severe (3-8)\nIntubation: Indicated (GCS ≤ 8)
Result: GCS 6 (E1V2M3) — Severe TBI, intubation indicated, neurosurgery consult
Frequently Asked Questions
What is the Glasgow Coma Scale?
The Glasgow Coma Scale (GCS) is a neurological assessment tool used to evaluate a patient's level of consciousness after a brain injury. Developed in 1974 by Graham Teasdale and Bryan Jennett at the University of Glasgow, it scores three components: Eye opening (1-4), Verbal response (1-5), and Motor response (1-6). The total score ranges from 3 (deep coma/brain death) to 15 (fully alert and oriented). GCS is used worldwide in emergency departments, ICUs, and by paramedics as a standardized way to communicate patient neurological status. It's particularly important in traumatic brain injury assessment and guides treatment decisions like intubation.
What are the limitations of the Glasgow Coma Scale?
While widely used, GCS has several limitations: 1) It cannot assess intubated patients' verbal response, reducing sensitivity. 2) Sedation, paralytic agents, and alcohol/drugs affect scoring. 3) Spinal cord injuries may prevent motor assessment. 4) Facial/orbital injuries may prevent eye assessment. 5) It doesn't assess brainstem reflexes (pupil response, corneal reflex). 6) Inter-rater reliability varies, especially for motor response. 7) It was designed for traumatic brain injury and may be less useful for metabolic coma. 8) The scale is ordinal, not interval — the difference between scores 3 and 6 is not the same as between 12 and 15. For these reasons, GCS should always be interpreted alongside the full clinical picture.
What formula does Glasgow Coma Scale Calculator use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
How do I interpret the result?
Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.
Does Glasgow Coma Scale Calculator work offline?
Once the page is loaded, the calculation logic runs entirely in your browser. If you have already opened the page, most calculators will continue to work even if your internet connection is lost, since no server requests are needed for computation.