What Is the Average IQ in the USA? (2026 Data & Sources)
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.
10 min read
IQ Data & Demographics
Average IQ by age, country and education — how intelligence is distributed across populations.
5 articles
The Flynn Effect: Why IQ Scores Rose for a Century (2026)
The Flynn effect is the generational rise in average IQ scores — about 3 points a decade in the 20th century. What causes it, whether it's still happening, its criticisms, and what it means, in plain English.
4 min read
Average IQ by Age — How IQ Changes Across the Lifespan
How average IQ scores relate to age, why tests are age-normed, when cognitive abilities peak, and what changes (and doesn't) as you get older.
4 min read
Average IQ by Country — Rankings, Data & Caveats
Average IQ estimates by country, how the data is gathered, the serious methodological caveats, and why national IQ comparisons are widely contested.
4 min read
What Is the Average IQ? (2026)
The average IQ is 100 by definition — but what does 'average' really mean, how is it set, and how does it vary by age, country and education?
5 min read