SNAP-IV Calculator (ADHD Rating Scale)

The SNAP-IV-26 covers the 18 DSM ADHD symptoms and 8 oppositional symptoms. Each item is rated from 0 (not at all) to 3 (very much). Average scores above the cut-off for the rater (parent or teacher) suggest symptoms in the clinical range and warrant a full assessment.

How to use the SNAP-IV Calculator

1. Who is rating?
2. 1. Fails to give close attention to details or makes careless mistakes
3. 2. Has difficulty sustaining attention in tasks or play
4. 3. Does not seem to listen when spoken to directly
5. 4. Does not follow through on instructions and fails to finish work
6. 5. Has difficulty organising tasks and activities
7. 6. Avoids tasks that need sustained mental effort
8. 7. Loses things needed for tasks or activities
9. 8. Is distracted by outside stimuli
10. 9. Is forgetful in daily activities
11. 1. Fidgets with hands or feet or squirms in seat
12. 2. Leaves seat when remaining seated is expected
13. 3. Runs about or climbs excessively when inappropriate
14. 4. Has difficulty playing quietly
15. 5. Is “on the go” or acts as if “driven by a motor”
16. 6. Talks excessively
17. 7. Blurts out answers before questions are completed
18. 8. Has difficulty waiting in turn
19. 9. Interrupts or intrudes on others
20. 1. Often loses temper
21. 2. Often argues with adults
22. 3. Often actively defies or refuses adult requests or rules
23. 4. Often deliberately does things that annoy other people
24. 5. Often blames others for his or her mistakes or misbehaviour
25. 6. Is often touchy or easily annoyed by others
26. 7. Is often angry and resentful
27. 8. Is often spiteful or vindictive

Results update as you type, and every field accepts the units shown in its menu.

How it works

Each answer carries the points shown in the published score. The calculator adds them up and maps the total to the published interpretation.

Scoring table

Cut-off averages (95th percentile)

Tips

• Answer based on the last two weeks, as the questionnaires ask.
• Screening scores are a starting point for a conversation with a professional.
• Repeat the questionnaire every few weeks to track change.
• If you have thoughts of harming yourself, contact a crisis line or emergency services now.

Common mistakes to avoid

• Treating a screening score as a diagnosis.
• Answering for how you want to feel rather than how you have felt.
• Waiting for a “high enough” score before asking for help.

Inputs explained

What each result means

• Inattention average = ([1. Fails to give close attention to details or makes careless mistakes] + [2. Has difficulty sustaining attention in tasks or play] + [3. Does not seem to listen when spoken to directly] + [4. Does not follow through on instructions and fails to finish work] + [5. Has difficulty organising tasks and activities] + [6. Avoids tasks that need sustained mental effort] + [7. Loses things needed for tasks or activities] + [8. Is distracted by outside stimuli] + [9. Is forgetful in daily activities])÷9
• Hyperactivity–impulsivity average = ([1. Fidgets with hands or feet or squirms in seat] + [2. Leaves seat when remaining seated is expected] + [3. Runs about or climbs excessively when inappropriate] + [4. Has difficulty playing quietly] + [5. Is “on the go” or acts as if “driven by a motor”] + [6. Talks excessively] + [7. Blurts out answers before questions are completed] + [8. Has difficulty waiting in turn] + [9. Interrupts or intrudes on others])÷9
• Oppositional average = ([1. Often loses temper] + [2. Often argues with adults] + [3. Often actively defies or refuses adult requests or rules] + [4. Often deliberately does things that annoy other people] + [5. Often blames others for his or her mistakes or misbehaviour] + [6. Is often touchy or easily annoyed by others] + [7. Is often angry and resentful] + [8. Is often spiteful or vindictive])÷8

Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.