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.
Working memory holds and manipulates information for seconds at a time. Its real capacity is about four chunks — not seven — it correlates with fluid intelligence at r ≈ .72, and it forms one of the four index scores behind your WAIS IQ.
The average IQ in the USA is 100 — by design. Here's why some sites say 97.43, what state IQ rankings actually measure, and how US adults really compare internationally.
The Wechsler Adult Intelligence Scale is the world's most used adult IQ test. Its editions, index scores, the General Ability Index — and why independent researchers reject the WAIS-5's five-factor structure.
The Cognitive Reflection Test answers are 5 cents, 5 minutes and 47 days. Why the intuitive answers fail, what your score means, and whether knowing the answers really invalidates it.
Cognitive tests fall into three unrelated categories. How clinical screens like the MoCA and MMSE differ from IQ tests, what the scores mean, and why the 26/30 cutoff misleads.
The Mensa Norway test is 35 puzzles in 25 minutes, scored 85–145. Why 145 is a ceiling and not a score, why it can't qualify you for Mensa, and how accurate it really is.
Einstein never took an IQ test. Where the 160 figure came from, why earlier sources said 205 and 207, and why no one's IQ is meaningfully 160.
An IQ in the 80s is below average but normal — the 9th to 23rd percentile. What the “Low Average” label means, why it is not an intellectual disability, and how much the number is worth.
Ability tests, trait questionnaires and mixed models measure different things. How the MSCEIT is scored, why self-report EI is mostly personality, and why there is no EQ score.
