NIH Stroke Scale (NIHSS) Calculator
Use this tool to estimate a total NIHSS score (0-42) based on selected findings. Choose the best matching option for each item below, then click Calculate NIHSS.
What is the NIHSS?
The National Institutes of Health Stroke Scale (NIHSS) is a standardized neurologic exam used to quantify stroke severity. It evaluates consciousness, language, neglect, vision, eye movement, motor strength, coordination, sensation, and speech. Because it uses a consistent scoring framework, the NIH Stroke Scale helps teams communicate clearly and track changes over time.
How NIHSS score interpretation usually works
- 0: No measurable neurologic deficit
- 1-4: Minor stroke symptoms
- 5-15: Moderate stroke
- 16-20: Moderate-to-severe stroke
- 21-42: Severe stroke
These ranges are practical guides, not strict rules. Treatment decisions rely on symptom onset time, imaging, contraindications, and bedside clinical judgment.
How to use this NIHSS scale calculator
Step-by-step
- Select one option for each NIHSS exam item (1a through 11).
- Click Calculate NIHSS to generate the total score and severity band.
- Use Reset to clear all selections back to zero.
This calculator is designed to mirror standard point values and provide quick score summation. It does not replace formal stroke workflows.
Why NIHSS matters in stroke care
1) Baseline severity measurement
A numeric score helps establish neurologic baseline at first evaluation. This baseline is important when assessing deterioration or improvement.
2) Communication across teams
Emergency, neurology, ICU, and rehabilitation staff can reference the same metric, improving handoffs and continuity of care.
3) Clinical research and outcomes tracking
The NIHSS is widely used in stroke trials and quality programs, allowing more reliable comparison between patients, centers, and interventions.
Important limitations
- The NIHSS can under-represent some posterior circulation stroke symptoms.
- Scoring quality depends on training and exam consistency.
- A low score does not automatically mean low risk.
- Clinical decisions should never be based on a calculator alone.
NIH Stroke Scale calculator FAQ
Is this a diagnostic tool?
No. It is a scoring aid. Diagnosis and treatment planning require full medical evaluation.
Can NIHSS predict recovery?
Higher scores often correlate with more severe deficits, but recovery depends on many factors: stroke type, location, reperfusion timing, age, comorbidities, and rehab intensity.
When should emergency care be sought?
Immediately, if stroke is suspected. Sudden facial droop, arm weakness, speech changes, vision loss, imbalance, or severe neurologic symptoms are emergencies.