IQ guides

Plain explanations of IQ scores, percentiles and how the test works.

• What Is a Good IQ Score?

  What counts as a good IQ score? See how scores spread around the average of 100, what 110, 120 or 130 mean in percentiles, and how much one number tells you.

• IQ Score Chart: Ranges, Percentiles and Labels

  An IQ score chart with every range from below 70 to above 145: the percentile for each, the share of people who score there, and the labels tests commonly use.

• Average IQ: What 100 Really Means

  The average IQ is 100 by design. Learn how the 100 and 15 scale works, how norm groups are built, why scores drift over time, and what an average score means.

• IQ Percentile: How to Convert an IQ Score

  Convert any IQ score to a percentile with a clear table from 85 to 145, learn what a percentile means, and see why every score comes with a confidence range.

• How IQ Tests Work: Question Types and Scoring

  How IQ tests work: the question types they use, from matrices to memory tasks, how answers become a score, and why online tests are self-assessments.