Expert guides on intelligence, IQ testing, cognitive science, and psychometric research — written to be accurate, accessible, and useful.
IQ stands for Intelligence Quotient. Learn what it means, how it is measured, and what the average IQ score of 100 really tells you.
The average IQ is 100. Discover how the bell curve works, score distribution by age, the Flynn Effect, and what scoring at average actually means.
From Below Average to Exceptionally Gifted — understand every tier of the IQ classification scale, its rarity, and what each range means.
How are IQ tests structured? Learn about question formats, difficulty weighting, normative scoring, and what makes a test scientifically valid.
Understand deviation IQ, normative samples, percentile conversion, and how clinical vs. online IQ measurement compares.
What score counts as high IQ? Learn the thresholds, what high IQ means in practice, MENSA requirements, and the real limits of intelligence scores.
What IQ score defines genius? Explore the thresholds, famous estimated genius IQs, child prodigies, and why IQ alone does not make a genius.
Convert any IQ score to a percentile rank. Includes a full IQ-to-percentile conversion table and explanation of what percentile rankings mean.
How are IQ scores distributed across the population? Learn about the normal distribution, standard deviation, and why most people score near 100.
Look up any score to see its exact percentile, classification, rarity, and what it means in practice.