The Complete Resource
Intelligence & IQ: The Complete Guide
IQ, or intelligence quotient, is the most widely used measure of cognitive ability in science and psychology. This hub brings together everything you need: free tests, score breakdowns, age norms, career data, famous IQs, and the latest research—all in one place.
IQ Testing
Take the IQ Test
Free scientifically-validated assessment
IQ Percentile Calculator
Find your percentile from any IQ score
IQ Distribution Chart
Visualize the bell curve
IQ by Age Calculator
Age-adjusted IQ norms
IQ Genetics Calculator
Heritability & parent estimates
Mensa Eligibility Checker
Check if you qualify for Mensa
IQ Scores & Classifications
IQ by Age
Signs of Intelligence
Famous IQs
Historical Figures
Einstein, Da Vinci, Newton & more
Napoleon Bonaparte IQ
Estimate, evidence and source record
Winston Churchill IQ
Estimate, evidence and source record
Celebrities
Modern famous IQ scores
Fictional Characters
Estimated IQs from fiction
Historical Intelligence Index
Ranges, confidence and downloadable data
IQ & Careers
Career Cognitive Profiles
Evidence-aware profession guides
Mechanical Engineer IQ
What occupational evidence can support
Plumber IQ
Reasoning demands without false cutoffs
Career Demand Index
Cognitive demands by field
Cognitively Demanding Jobs
Transparent editorial comparisons
University IQs
Average IQ by university
IQ Data & Statistics
Learn More
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Take the IQ TestTake the Full IQ Test
Get your IQ score, percentile ranking, and cognitive profile with our scientifically validated assessment.