IQ guides
Straight answers to the most common questions about intelligence and IQ scores, without the myths.
What is IQ?What IQ means, where it came from, what IQ tests measure today, and what an IQ score can and can't tell you.The IQ scale and score rangesThe IQ scale explained: what each score range means, how rare it is and how IQ scores are distributed on the bell curve.What is the average IQ?The average IQ is 100 by definition. Learn what that means, how age affects raw ability, and why country averages need careful interpretation.IQ percentile calculatorConvert any IQ score into a percentile and see how rare it is. Includes an interactive IQ percentile calculator and a full table.What IQ is considered genius?What IQ counts as genius, how rare scores of 130, 145 and 160 are, and why tests can't reliably measure much higher.How IQ tests workHow modern IQ tests are designed and scored: abilities measured, item difficulty, item response theory, age norms and what makes a test reliable.Culture-fair and language-free IQ testsWhat a culture-fair or non-verbal IQ test is, why it matters for people who speak different languages, and its limits.Can you increase your IQ?Can IQ be raised? What research says about education, brain training, practice effects, sleep and health, without the hype.Tips for taking an IQ testPractical tips to get an accurate result on an IQ test: preparation, environment, time management and strategies for each question type.IQ test FAQAnswers to common questions about the free IQ Atlas test: how long it takes, how it's scored, accuracy, the world map, sharing and privacy.