Take a standardized IQ test administered by a licensed psychologist
Use a reputable, professionally normed online IQ test only as a rough estimate
Review the test’s score report for your IQ score and percentile
Compare results across multiple valid tests for consistency
Check whether the test measures verbal, nonverbal, working memory, and processing speed abilities
Make sure the test is age-normed
Avoid relying on unverified quizzes or entertainment tests
Ask a psychologist or testing center for a formal cognitive assessment
Look for a full-scale IQ score and subtest scores
Consider retesting later if results may have been affected by stress, fatigue, or illness