NIH Stroke Scale (NIHSS) calculator

Pick the answer for each of the 15 NIH Stroke Scale items as you examine the patient to get the total score and the severity group. The NIHSS measures stroke deficits for clinicians; it is not a diagnosis and does not decide treatment on its own.

NIHSS score0
Severity
0: no stroke symptoms

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How to use it

  1. Examine the items in order, from 1a to 11, as the scale is designed to be done.
  2. Pick the answer matching the patient’s first response for each item.
  3. Read the total and the severity group.

How the scale works

The 15 items have different ranges, and the total is their sum.

Item Range
1a Level of consciousness 0–3
1b Questions, 1c Commands 0–2 each
2 Gaze 0–2
3 Visual fields 0–3
4 Facial palsy 0–3
5a, 5b Arms 0–4 each
6a, 6b Legs 0–4 each
7 Limb ataxia 0–2
8 Sensory 0–2
9 Language 0–3
10 Dysarthria 0–2
11 Extinction and inattention 0–2

Worked example

A patient is alert and answers and obeys correctly (0, 0, 0), has a partial gaze palsy (1), full visual fields (0), partial lower facial paralysis (2), a right arm that cannot resist gravity (3), a right leg with some effort against gravity (2), no ataxia or sensory loss (0, 0), moderate aphasia (1), mild dysarthria (1) and no neglect (0). The total is 1 + 2 + 3 + 2 + 1 + 1 = 10, moderate stroke.

Tips

  • Score ataxia only when it is out of proportion to weakness; a limb that cannot move scores 0 for ataxia.
  • A patient in coma (1a = 3) gets fixed scores on several items; follow the official instructions.
  • Repeat the scale after treatment and at set times so changes are compared on the same scale.
  • A suspected stroke is an emergency: call emergency services. This page is for information.

Frequently asked questions

What is a normal NIHSS score?

0, meaning no measurable deficit on any item. The maximum is 42. The severity groups used here (minor 1–4, moderate 5–15, moderate to severe 16–20, severe 21–42) are common in practice but are not part of the scale itself.

How are untestable items scored?

Some items, such as a limb with an amputation or a fused joint, are marked UN (untestable) and are not added to the total. Choose 0 for them here and note the reason in the record.

Should I score what the patient can do or what I think they could do?

What the patient actually does on the first attempt. The scale's instructions are to record the response, not to coach or guess what the patient might manage.

Does a low NIHSS mean a stroke is not serious?

Not always. Some disabling deficits, such as isolated aphasia or vision loss, score few points. The decision on treatment looks at the deficit itself, not only the number.

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