What Does My IQ Score Mean?
Enter a score from a modern scale with a mean of 100 and standard deviation of 15. The results are mathematical context—not a diagnosis, validation of an online quiz, or substitute for the report that came with a professional assessment.
Supported range: 55–160. Scores at the extremes are less stable and more test-dependent.
A score of 100 is about 0.00 standard deviations above the conventional mean. Within the broad central range where about half of standardized scores fall.
Allow for measurement error. A single reported score is usually best understood as a range. The exact confidence interval belongs to the specific test manual and administration—not a universal ± number.
How to read the result
Percentiles compare a score with a reference group. They are not the percentage of questions answered correctly. A 90th-percentile result means a score was higher than roughly 90% of the standardization group, assuming the stated scoring scale applies.
Why the source of the score matters
Professionally administered instruments use age-based norms, standardized instructions, multiple subtests, and documented reliability evidence. Online quizzes vary widely. Converting an unvalidated quiz result through a bell-curve formula cannot make the original result clinically valid.
Useful next steps
- Check the name, edition, date, and standard deviation of the test.
- Read the confidence interval and subtest profile in the original report.
- For school, clinical, disability, or employment decisions, consult a qualified professional.
- Use online results for curiosity and practice, not diagnosis or self-worth.
Try our reasoning test for an educational category breakdown, or read the scoring methodology and limitations.