BYTETOOLS

Glasgow Coma Scale Calculator

Score eye, verbal and motor responses to get a GCS total in E V M notation, with a paediatric scale and proper not-testable handling.

Best response in each of the three components

4
Eye (E)
5
Verbal (V)
6
Motor (M)
15/15
Total

Result

E4 V5 M6 = 15/15

13–15 — mild brain injuryThe band most head injuries presenting to an emergency department fall into.
Eye opening4 — Opens eyes spontaneously
Verbal response5 — Orientated
Motor response6 — Obeys commands
NotationE4 V5 M6

Severity bands

TotalConventional labelWhat it usually triggers
13–15MildObservation and imaging decided by a head-injury rule such as the Canadian CT Head Rule or NICE guidance, not by the score alone.
9–12ModerateCT head and close neurological observation with repeat scoring.
3–8SevereAirway protection is usually considered at 8 or below, alongside urgent imaging and neurosurgical referral.

The minimum possible total is 3, not 0 — a patient with no response at all still scores E1 V1 M1. The maximum is 15.

Estimates only, not medical advice. The GCS records observed behaviour at one moment; the trend across repeated assessments matters far more than any single number, and the motor component carries most of the prognostic weight, which is why the component profile should always be reported alongside the total. Sedation, alcohol, drugs, hypoglycaemia, hypoxia, hypothermia, seizure, dysphasia, deafness, an existing learning disability and a language barrier all depress the score without reflecting brain injury. Intubation makes the verbal component untestable — record NT rather than 1, and never impute a total. Assess and act on your local head-injury and neurological observation protocol, not on a web page.

What is the Glasgow Coma Scale Calculator?

The Glasgow Coma Scale adds eye opening scored 1 to 4, verbal response scored 1 to 5, and best motor response scored 1 to 6, giving a total from 3 to 15. It is reported as E, V and M components alongside the total.

  • Adult and paediatric verbal and motor scales in one tool
  • Conventional E#V#M# notation alongside the total out of 15
  • Not-testable handling that suppresses the total rather than scoring 1
  • Mild, moderate and severe bands with what each usually triggers
  • Copyable summary listing the exact response selected for each component
  • Fully client-side — no patient information leaves your browser

How to use the Glasgow Coma Scale Calculator

  1. 1

    Choose the adult scale or the paediatric scale for children under two years old.

  2. 2

    Select the best eye-opening response observed, or mark it not testable.

  3. 3

    Select the best verbal response, marking it not testable if the patient is intubated.

  4. 4

    Select the best motor response — this is the component with most of the prognostic weight.

  5. 5

    Read the E V M notation, the total and its severity band, then copy the summary for the notes.

About the Glasgow Coma Scale Calculator

The ByteTools Glasgow Coma Scale Calculator scores eye opening, verbal response and best motor response, reports the result in the conventional E#V#M# notation, and bands the total as mild, moderate or severe. A paediatric toggle swaps the verbal and motor descriptors for age-appropriate behaviours in children under two.

Crucially, it handles untestable components properly. If a patient is intubated, paralysed or has eyes swollen shut, selecting not testable suppresses the total instead of quietly scoring that component as 1 — the error the 2014 GCS revision was written to stop, because inventing a lower total can trigger the wrong escalation.

Everything runs locally in your browser and nothing you enter is uploaded or stored. This is an estimate and a documentation aid only, not medical advice: sedation, alcohol, recreational drugs, hypoglycaemia, hypoxia, dysphasia, deafness and a language barrier all depress the score without any change in brain injury, and the trend across repeated assessments matters far more than a single reading.

Frequently asked questions

What is the lowest possible GCS score?

Three, not zero. A patient with no response at all still scores E1 V1 M1, because each component has a minimum of 1. The maximum is 15, made up of E4, V5 and M6.

What GCS score means severe brain injury?

Conventionally 3 to 8 is described as severe, 9 to 12 as moderate and 13 to 15 as mild. A score of 8 or below is the usual threshold at which airway protection is considered, though that decision depends on the whole clinical picture rather than the number alone.

How do you score GCS in an intubated patient?

Mark the verbal component as not testable and report the profile — for example E4 VNT M6 — rather than deriving a total. The older habit of writing V1 or adding a T suffix invents a lower score, which is why the 2014 revision explicitly recommends against it.

What is the paediatric Glasgow Coma Scale?

It keeps the same three components but replaces the verbal and motor descriptors with behaviours appropriate to an infant: cooing and babbling instead of orientated speech, and spontaneous purposeful movement instead of obeying commands. It is intended for children under about two years.

Why does the motor component matter most?

Because it discriminates best between levels of injury and carries most of the prognostic information in published series. That is why the components should always be reported individually — two patients with a total of 9 can have very different motor responses and very different outlooks.

What can make the GCS misleading?

Sedation, alcohol, recreational drugs, hypoglycaemia, hypoxia, hypothermia, a recent seizure, dysphasia, deafness, an existing learning disability and a language barrier all lower the score without any change in brain injury. Trend the score over repeated assessments rather than treating one reading as the truth.

Related tools