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Glasgow Coma Scale (GCS) Calculator

· Last updated：2026-08-06

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Calculate the Glasgow Coma Scale (GCS) from the three response components: Eye Opening (E, 1–4), Verbal Response (V, 1–5), and Motor Response (M, 1–6). Total = E + V + M, range 3–15. Supports the '1t' notation for intubated/untestable verbal response (counted as V = 1, with an annotation, and recommends reporting the E_M_V component string). Severity bands: 13–15 mild, 9–12 moderate, 3–8 severe (severe scores commonly prompt airway protection). Derived from Teasdale & Jennett, Lancet 1974, with the Lancet Neurology 2014 review and 2024 update. Not medical advice.

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Health
Input types
select
Output type
json
Sample coverage
4
API ready
Yes

Overview

The Glasgow Coma Scale (GCS) Calculator adds Eye Opening (E), Verbal Response (V), and Motor Response (M) scores to produce a total from 3 to 15, with mild, moderate, and severe severity bands. It also supports the 1t notation for an intubated or untestable verbal response. This tool is not medical advice.

When to use

  • Calculate a GCS total from documented eye, verbal, and motor responses.
  • Record an intubated or otherwise untestable verbal response as V1t.
  • Review the score band and report the E_M_V component string alongside the total.

How it works

  1. 1Select the best Eye Opening response, scored from E1 to E4.
  2. 2Select the best Verbal Response, scored from V1 to V5, or choose 1t when verbal testing is not possible.
  3. 3Select the best Motor Response, scored from M1 to M6.
  4. 4The calculator adds E + V + M, returns the GCS total from 3 to 15, and assigns a severity band.

Use cases

  • Documenting consciousness in trauma and traumatic brain injury assessments.
  • Supporting neurological observations in emergency and critical care settings.
  • Standardizing GCS calculations when reporting eye, verbal, and motor components.

Examples

1. Alert oriented patient: E4 V5 M6 = GCS 15

Clinician

Background

The patient opens their eyes spontaneously, is oriented, and obeys commands.

Problem

Calculate the total GCS and identify its severity band.

How to use

Select Spontaneous for Eye Opening, Oriented for Verbal Response, and Obeys commands for Motor Response.

Outcome

The calculator returns E4_V5_M6 = 15, classified as Mild (13–15).

2. Intubated trauma patient: E2 V1t M4 = GCS 7

Emergency clinician

Background

The patient opens their eyes to pressure, is intubated and cannot be tested verbally, and shows normal flexion or withdrawal.

Problem

Calculate the score while preserving the intubation notation in the component report.

How to use

Select To pressure for Eye Opening, Intubated / untestable for Verbal Response, and Normal flexion (withdrawal) for Motor Response.

Outcome

The calculator returns E2_V1t_M4 = 7, with V counted as 1 and the result classified as Severe (3–8).

FAQ

What is the Glasgow Coma Scale?

The GCS measures consciousness using eye opening, verbal response, and motor response scores.

What is the GCS score range?

The total ranges from 3 to 15.

How is the GCS total calculated?

Add the Eye Opening, Verbal Response, and Motor Response values: GCS = E + V + M.

How does the calculator handle an intubated patient?

Choose 1t for an intubated or untestable verbal response. It counts as V = 1 and is annotated in the result.

What do the GCS severity bands mean?

Scores of 13–15 are mild, 9–12 are moderate, and 3–8 are severe. The result does not replace clinical assessment.

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