Average IQ by Country - Global Intelligence Rankings 2026

Global IQ Rankings: The Data

Top 20 Countries by Estimated Average IQ

Based on research by Richard Lynn, David Becker ("The Intelligence of Nations," 2019), and World Population Review data:

Rank	Country	Estimated Average IQ
1	Japan	106.48
2	Taiwan	106.47
3	Singapore	105.89
4	Hong Kong	105.37
5	China	104.10
6	South Korea	102.35
7	Belarus	101.60
8	Finland	101.20
9	Netherlands	100.74
10	Germany	100.74
11	Austria	100.30
12	Switzerland	100.20
13	United Kingdom	99.12
14	Belgium	99.00
15	Canada	98.00
16	Czech Republic	98.00
17	Australia	97.80
18	France	97.30
19	United States	97.43
20	Norway	97.20

Regional Averages

Region	Average IQ Range	Key Factor
East Asia	102–106	Intensive education systems, high nutrition standards
Western Europe	97–101	Strong public education, healthcare
Eastern Europe	95–102	Varies widely; strong STEM education tradition
North America	97–98	Diverse population, high variation
South America	85–95	Developing education infrastructure
South Asia	76–85	Improving rapidly with economic development
Sub-Saharan Africa	65–80	Most affected by environmental factors

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Why Do National IQ Scores Differ?

The differences are not genetic. Decades of research point to environmental factors as the primary drivers.

The Big Five Factors

Factor	Mechanism	Evidence
Education quality	Years of schooling directly increase measured IQ	Ritchie & Tucker-Drob (2018): Each year of education adds 1–5 IQ points
Nutrition	Iodine deficiency alone can reduce IQ by 10–15 points	WHO: 2 billion people worldwide are iodine-deficient
Healthcare	Childhood diseases impair cognitive development	Malaria, parasitic infections correlate with lower national IQ
Economic development	Poverty limits access to all of the above	HDI (Human Development Index) correlates strongly with national IQ (r ≈ 0.70)
Urbanization	Urban environments provide more cognitive stimulation	Urban-rural IQ gaps of 5–10 points are documented worldwide

The Flynn Effect: Proof That IQ Is Environmental

The strongest evidence that national IQ reflects environment, not genetics, is the Flynn Effect — the observation that IQ scores rise approximately 3 points per decade as conditions improve.

Country	Flynn Effect Observed
Japan	IQ rose ~20 points from 1950 to 2000
Kenya	Average IQ increased significantly with improved nutrition (Daley et al., 2003)
Denmark	IQ rose steadily until ~1998, then slightly declined (Teasdale & Owen, 2008)
United States	Steady rise throughout the 20th century

If the differences were genetic, they would be stable across generations. The Flynn Effect proves they are not.

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Important Caveats About National IQ Data

Methodological Concerns

National IQ estimates should be treated with caution for several reasons:

Issue	Explanation
Sample size	Some country estimates are based on small, non-representative samples
Sample selection	Urban vs. rural, educated vs. uneducated populations may be oversampled
Test bias	IQ tests developed in Western contexts may disadvantage other cultures
Testing conditions	Unfamiliarity with test format, testing anxiety, and environmental factors affect scores
Data age	Some estimates use data from decades ago that may no longer reflect current conditions

What Lynn and Becker's Critics Say

Prominent criticisms of national IQ research include:

• Wicherts et al. (2010): Found systematic errors in data selection for African countries, with corrected estimates significantly higher
• Cultural bias: Tests designed for Western, educated populations may not measure the same construct in different cultural contexts
• Ecological fallacy: National averages tell you nothing about any individual person

The Right Way to Interpret the Data

1. National IQ is a proxy for development conditions, not innate ability
2. Individuals within any country span the full IQ range
3. As conditions improve, so do scores (Flynn Effect)
4. Rankings should motivate investment in education and health, not stereotyping

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PISA Scores: An Alternative Lens

The OECD's PISA (Programme for International Student Assessment) provides another perspective on national cognitive ability, testing 15-year-olds in math, reading, and science.

PISA 2022 Results (Top Performers)

Rank	Country	Math	Reading	Science
1	Singapore	575	543	561
2	Macao	552	510	543
3	Taiwan	547	515	537
4	Hong Kong	540	500	520
5	Japan	536	516	547
6	South Korea	527	515	528
...	...	...	...	...
25	United States	465	504	499
26	United Kingdom	489	494	503

PISA rankings broadly align with IQ rankings, reinforcing that both measure similar underlying cognitive factors shaped by education and environment.

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What Determines Your Individual IQ?

Regardless of which country you live in, your individual IQ is influenced by:

Nature (50–80%)

• Genetics: Twin studies consistently show strong heritability (Plomin & Deary, 2015)
• Brain structure: Gray matter volume and neural efficiency correlate with IQ
• Individual variation: Massive range exists within every population

Nurture (20–50%)

• Education: The single most controllable factor
• Nutrition: Especially in early childhood
• Sleep: 7–9 hours optimizes cognitive performance
• Exercise: 150 minutes/week of aerobic exercise increases BDNF
• Environment: Intellectually stimulating surroundings

Want to know where you stand? → Take the Free IQ Test

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Summary

• Top-ranked countries: Japan, Taiwan, Singapore, Hong Kong, China (~104–106)
• Western nations: 97–101 (US, UK, Germany, France)
• Key drivers: Education, nutrition, healthcare, economic development — not genetics
• Flynn Effect: IQ rises ~3 points per decade as conditions improve
• Important caveat: National averages reflect development levels, not innate ability
• PISA scores confirm similar patterns to IQ rankings

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Frequently Asked Questions

Q: Which country has the highest IQ?

A: According to most datasets, Japan and Taiwan lead with estimated averages around 106. However, these estimates have significant uncertainty margins, and the differences between top-ranked countries are small.

Q: Does national IQ mean some people are genetically smarter?

A: No. The scientific consensus is that national IQ differences reflect environmental factors — education, nutrition, healthcare, and economic conditions. The Flynn Effect demonstrates that IQ rises within populations as conditions improve, which would not happen if the differences were primarily genetic.

Q: Why is the US average IQ not higher given its wealth?

A: The US has enormous internal variation due to its diverse population and significant inequality in access to education and healthcare. The national average obscures the fact that some US subgroups score among the highest in the world, while others are disadvantaged by systemic factors.

Q: Can developing countries catch up in IQ scores?

A: Yes. Vietnam is a notable example — despite being a lower-income country, it scores comparably to many developed nations on PISA tests due to strong educational investment. The Flynn Effect shows that IQ consistently rises with improved conditions, typically 3 points per decade.

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Last updated: February 10, 2026