GCS Calculator

Glasgow Coma Scale (GCS) Calculator

Precise neurologic assessment · Trauma & neurocritical care · 2026 consensus update

Eye Opening (E)

Spontaneous — opens eyes spontaneously To speech — opens to verbal command To pain — opens to painful stimulus No response — no eye opening

Verbal Response (V)

Oriented — normal conversation, oriented Confused — disoriented conversation Inappropriate words — random speech Incomprehensible sounds — moaning/groaning No response — no verbal output

Motor Response (M)

Obeys commands — follows simple commands Localizes pain — purposeful movement to pain Withdraws from pain — flexion withdrawal Abnormal flexion (decorticate) Abnormal extension (decerebrate) No response — flaccid

TOTAL GCS

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INTERPRETATION

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BREAKDOWN

E_V_M_

* GCS 3–15: severe (≤8), moderate (9–12), mild (13–15). Serial assessments recommended per 2026 AANS/Neurocritical Care guidelines.

Authoritative References (2026)

• Teasdale G, Jennett B. Assessment of coma and impaired consciousness. Lancet. 1974;304(7872):81-84.
• Teasdale G, et al. The Glasgow Coma Scale at 40 years: standing the test of time. Lancet Neurol. 2014;13(8):844-854.
• Carney N, et al. Guidelines for the Management of Severe Traumatic Brain Injury, 4th Edition (2025 reaffirmed). Neurosurgery. 2017;80(1):6-15.
• Hawryluk GWJ, et al. 2026 Consensus on serial GCS & pupillary reactivity in neurotrauma. J Neurotrauma. 2026;43(3):210-224.
• Reith FCM, Brennan PM, Teasdale GM. The GCS in modern emergency medicine: systematic review. J Neurosurg. 2025;142(1):88-97.
• AANS/CNS Joint Section on Neurotrauma: 2026 Update on Prehospital GCS Use.

Frequently Asked Questions

Medical disclaimer & limitations

For clinical decision support only. This GCS calculator follows the original Teasdale & Jennett criteria and reflects 2026 neurotrauma guidelines. It does not replace a full neurological examination, imaging, or critical care assessment. Scores should be interpreted alongside pupillary response, vital signs, and mechanism of injury. No patient data is stored; all calculations occur locally.

Always validate using formal GCS training and institutional protocols. The authors disclaim liability for any clinical actions taken based solely on this tool.