SNAP-IV Score Calculator

What is the SNAP-IV 26-Item Rating Scale?

The SNAP-IV (Swanson, Nolan, and Pelham, Version IV) 26-Item Teacher and Parent Rating Scale is a validated clinical screening tool used by psychologists, pediatricians, and educators to assess symptoms of Attention Deficit Hyperactivity Disorder (ADHD) and Oppositional Defiant Disorder (ODD) in children and adolescents aged 6 to 18 years.

The instrument assesses behaviors across three clinical domains using a 4-point rating scale from 0 ("Not at all") to 3 ("Very much"):

• Inattention (Items 1 to 9): Evaluates difficulty sustaining focus, following instructions, organizational skills, forgetfulness, and distractibility.
• Hyperactivity / Impulsivity (Items 10 to 18): Evaluates physical restlessness, excessive talking, blurting out responses, difficulty awaiting turns, and intrusiveness.
• Oppositional Defiance (Items 19 to 26): Evaluates temper loss, active noncompliance, irritability, defiance of rules, and vindictiveness.

Scoring and Clinical Cutoffs

Each subscale score is evaluated both as a raw point sum and as an item average score (total score divided by the number of answered items in that subset). Clinical consensus and the 95th percentile normative threshold define the following average score cutoffs:

Clinical Diagnostic Context (DSM-5-TR)

According to DSM-5 criteria, formal ADHD diagnosis requires persistent symptoms (at least 6 months) across multiple settings (both home and school), with clear evidence of social, academic, or occupational impairment before age 12. SNAP-IV is an essential screening instrument but must be interpreted alongside comprehensive developmental history and direct medical evaluation.

For other pediatric and health metrics, you can explore our Sleep Debt Calculator or Smoking Recovery Calculator.