IQ KNOWLEDGE CENTER
Understand cognition, without the hype
Evidence-aware guides, score explanations, practice questions, interactive tools, and research literacy—with uncertainty made visible.
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IQ essentials
10 guidesWhat is IQ?
Learn what IQ means, what an IQ test measures, and the important limits of intelligence quotient scores.
Read guide →How is IQ measured?
Understand standardized IQ testing, age-based norms, subtests, percentiles, and why every result has a margin of error.
Read guide →What is the average IQ?
See why the average IQ is usually 100, how standard deviations and percentiles work, and how to interpret comparisons responsibly.
Read guide →IQ score ranges explained
Explore common IQ score bands, approximate percentiles, confidence intervals, and the limits of labels.
Read guide →What does an IQ of 120 mean?
Learn how an IQ score of 120 compares with the average, its approximate percentile, and what it can and cannot predict.
Read guide →What does an IQ of 140 mean?
Understand the approximate percentile of a 140 IQ score, testing at the extreme, and why context still matters.
Read guide →Can IQ change over time?
Discover how stable IQ tends to be, why scores can change, and how development, health, education, and practice affect testing.
Read guide →Is IQ genetic?
Learn how genes and environment both contribute to cognitive differences, and what heritability does—and does not—mean.
Read guide →IQ vs EQ: what is the difference?
Compare IQ and emotional intelligence (EQ), including what each concept covers, how they are measured, and their limitations.
Read guide →IQ vs intelligence: are they the same?
Understand the difference between a standardized IQ score and the broader concept of human intelligence.
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IQ score interpretation
7 guidesIQ 80 meaning: percentile and interpretation
What an IQ score of 80 may mean, its percentile, uncertainty, strengths, and misconceptions.
Read guide →IQ 90 meaning: percentile and interpretation
What an IQ score of 90 may mean, its percentile, uncertainty, strengths, and misconceptions.
Read guide →IQ 100 meaning: percentile and interpretation
What an IQ score of 100 may mean, its percentile, uncertainty, strengths, and misconceptions.
Read guide →IQ 110 meaning: percentile and interpretation
What an IQ score of 110 may mean, its percentile, uncertainty, strengths, and misconceptions.
Read guide →IQ 130 meaning: percentile and interpretation
What an IQ score of 130 may mean, its percentile, uncertainty, strengths, and misconceptions.
Read guide →IQ 145 meaning: percentile and interpretation
What an IQ score of 145 may mean, its percentile, uncertainty, strengths, and misconceptions.
Read guide →IQ 160 meaning: percentile and interpretation
What an IQ score of 160 may mean, its percentile, uncertainty, strengths, and misconceptions.
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Famous people and IQ claims
8 guidesAlbert Einstein IQ: what is actually known?
A careful review of reported Albert Einstein IQ claims and why popular numbers are unverified.
Read guide →Elon Musk IQ: what is actually known?
A careful review of reported Elon Musk IQ claims and why popular numbers are unverified.
Read guide →Stephen Hawking IQ: what is actually known?
A careful review of reported Stephen Hawking IQ claims and why popular numbers are unverified.
Read guide →Nikola Tesla IQ: what is actually known?
A careful review of reported Nikola Tesla IQ claims and why popular numbers are unverified.
Read guide →Bill Gates IQ: what is actually known?
A careful review of reported Bill Gates IQ claims and why popular numbers are unverified.
Read guide →Leonardo da Vinci IQ: what is actually known?
A careful review of reported Leonardo da Vinci IQ claims and why popular numbers are unverified.
Read guide →Isaac Newton IQ: what is actually known?
A careful review of reported Isaac Newton IQ claims and why popular numbers are unverified.
Read guide →Marie Curie IQ: what is actually known?
A careful review of reported Marie Curie IQ claims and why popular numbers are unverified.
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Practice questions
7 guides20 Pattern Recognition Questions with Answers
Pattern practice helps you describe transformations rather than guess. Work through examples, answers, and responsible practice advice.
Read guide →Matrix Reasoning Practice
Matrix items combine row and column rules. Work through examples, answers, and responsible practice advice.
Read guide →Logical Sequences Practice
Sequences may use alternating operations or nested cycles. Work through examples, answers, and responsible practice advice.
Read guide →Number Series Practice
Number series test arithmetic structure, not advanced mathematics. Work through examples, answers, and responsible practice advice.
Read guide →Spatial Rotation Questions and Strategies
Mental rotation preserves handedness; reflection reverses it. Work through examples, answers, and responsible practice advice.
Read guide →Verbal Analogies Practice
The same relationship must hold across both pairs. Work through examples, answers, and responsible practice advice.
Read guide →Visual Reasoning Practice
Visual reasoning combines features, space, and rule testing. Work through examples, answers, and responsible practice advice.
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Interactive tools
8 guidesIQ Percentile Calculator
Convert an IQ score to an approximate percentile on a mean-100, SD-15 distribution.
Open tool →Mental Age Calculator: History and Limits
Explore the historical ratio-IQ formula and why modern adult tests no longer use it.
Open tool →Brain Age Test
Try a short non-diagnostic attention and memory activity with an age-neutral result.
Open tool →Reaction Time Test
Measure simple browser reaction time and learn about hardware limitations.
Open tool →Short-Term Memory Test
Try progressively longer sequence recall.
Open tool →Color Vision Screen
Try basic color discrimination that is not a medical diagnosis.
Open tool →Cognitive Style Quiz
Reflect on problem-solving preferences without ranking styles.
Open tool →Learning Preferences Quiz
Explore study preferences without claiming a fixed learning style.
Open tool →EXPLORE
Brain training
7 guidesMemory Exercises: a Practical Plan
Use spaced recall, chunking, and retrieval practice.
Read guide →Processing Speed Games
Train scanning and accurate response selection.
Read guide →Logic Puzzles: Methods That Transfer
Externalize constraints and test assumptions.
Read guide →Daily Brain Challenge
Rotate reasoning, memory, language, and calculation.
Read guide →Sudoku Strategies
Sudoku rewards constraint tracking, not guessing.
Read guide →Mental Math Techniques
Use decomposition, compensation, and estimation.
Read guide →Concentration Exercises
Control distractions and use clear work intervals.
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IQ statistics
7 guidesAverage IQ by Country: Why Rankings Need Caution
Country tables often mix non-representative samples, years, instruments, languages, and imputation. A simple league table can mislead.
Read guide →Average IQ by Age
Age-normed scores stay centered near 100 within each age group while raw performance and particular abilities change.
Read guide →IQ Distribution Explained
How the bell curve, mean, standard deviation, tails, and real norms relate to IQ.
Read guide →IQ Percentiles Table and Explanation
Translate common scores into approximate percentile ranks.
Read guide →Standard Deviation in IQ Testing
Why a 15-point standard deviation describes spread and connects scores to percentiles.
Read guide →The Flynn Effect Explained
Historical raw-score rises led to renorming; trends vary by place, period, and ability.
Read guide →Historical IQ Trends
Changing raw scores in relation to norms, education, health, technology, and sampling.
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Science of testing
8 guidesRaven’s Progressive Matrices Explained
Visual patterns assess nonverbal reasoning, but “culture reduced” does not mean culture free.
Read guide →WAIS Intelligence Test Explained
The Wechsler Adult Intelligence Scale is an individually administered clinical battery with multiple indexes.
Read guide →Stanford–Binet Intelligence Scales Explained
An individually administered assessment spanning cognitive factors and age ranges.
Read guide →Fluid Intelligence
Reasoning through novel problems with less reliance on learned knowledge.
Read guide →Crystallized Intelligence
Acquired knowledge and skills shaped by education and experience.
Read guide →Working Memory Explained
Holding and manipulating limited information during complex tasks.
Read guide →Executive Function Explained
Goal maintenance, inhibition, shifting, planning, and monitoring—not one skill.
Read guide →Processing Speed Explained
Efficiency on simple or familiar operations, interpreted alongside accuracy.
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IQ questions answered
6 guidesIs an Online IQ Test Accurate?
Accuracy depends on item quality, norms, reliability, validity, security, language, and interpretation.
Read guide →Can You Improve Your IQ?
Education and practice improve knowledge and strategies; broad transfer and long-term score changes vary.
Read guide →Does Sleep Affect IQ Test Performance?
Poor sleep can affect attention, memory, speed, and consistency.
Read guide →Does Music Increase Intelligence?
Music builds musical skill, but passive listening does not guarantee a general-IQ increase.
Read guide →Can Anxiety Lower IQ Test Scores?
Anxiety can consume attention or working memory, but effects vary.
Read guide →What Age Should Children Take an IQ Test?
Testing should answer a clear question with an age-appropriate professional instrument.
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Comparisons
5 guidesIQ Test vs Mensa Admission Test
A broad battery describes a profile; admission testing determines whether an accepted score meets an organization’s threshold.
Read guide →IQ vs SAT
The tests overlap in some reasoning demands but differ in purpose, content, preparation, scaling, and interpretation.
Read guide →IQ vs GPA
IQ is normed test performance; GPA reflects grades, effort, opportunity, coursework, and school context.
Read guide →IQ vs Emotional Intelligence
IQ samples cognitive ability; emotional measures address recognizing, understanding, and regulating emotion.
Read guide →IQ vs Creativity
Reasoning and creativity can relate, but originality, expertise, motivation, and environment are not reducible to IQ.
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Research explainers
4 guidesNew Intelligence Study? How to Read the Evidence
Check preregistration, sampling, measurement, effect size, uncertainty, replication, and causal claims.
Read guide →AI and IQ Testing
Generative AI changes test security, item generation, accessibility, scoring claims, privacy, and unsupervised interpretation.
Read guide →Memory Research Explained
Understand encoding, consolidation, retrieval, working memory, and translation from laboratory tasks.
Read guide →Cognitive Aging Studies Explained
Longitudinal and cross-sectional studies differ on age, cohorts, health, knowledge, speed, and variation.
Read guide →READY TO BEGIN?
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