In-depth, expert-reviewed guides on IQ scores, intelligence testing, demographics and how to take a test — from the IQCognify editorial team.
The full IQ score chart at a glance: look up any score to see its classification band, percentile, rarity, and share of the population, plus the bell curve — the complete reference scale (mean 100, SD 15).
What IQ actually measures, where the concept came from, the g-factor, how modern IQ tests work, and the limits of a single intelligence number.
What counts as a good IQ score? A clear beginner's guide to the average (90–109), high-average and superior (110–129), gifted (130+) and genius (140+) ranges, with percentile context, tables and real-world interpretations.
Numerical reasoning means reasoning with numbers and mathematical relations — which CHC treats as a narrow ability under fluid reasoning, distinct from acquired quantitative knowledge. What the distinction means and what a short test can sample.
“Bias” covers at least six different psychometric questions, and the research answers them differently. Measurement invariance, differential item functioning and predictive bias explained — without a blanket verdict.
An IQ score is a summary of several distinct abilities. What the broad abilities are, how they relate to general intelligence, and how much the separate scores really tell you.
Pattern recognition is the core of non-verbal reasoning tests. How matrix items are built, the rules they use, the mistakes people make — and nine worked examples.
Dog IQ" mostly means one 1994 obedience survey — not a real IQ test. Here's what it measured, what modern research adds, and how to test your own dog.
"155" is everywhere online — but no test, examiner, or date backs it. Here's what's actually documented, and why estimates range from 100 to 160.
A free test with 16M+ takers and published technical reports — plus a copycat using the same name. Here's how to tell them apart.
Almost any site can put your name on a PDF and call it "official." Here's what actually separates a real certificate from a printable one.
BuzzFeed runs several different "IQ test" quizzes — and one openly admits results are "entirely inaccurate." Here's what they actually measure.
