Average IQ by Country - Global Intelligence Rankings 2026

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.

"Which country has the highest IQ?" "Why do some nations score higher than others?" National IQ rankings generate enormous interest — and controversy — whenever they're published.

In this article, we present the latest average IQ data by country, explain the factors behind the numbers, and most importantly, discuss why these rankings need to be interpreted with caution.

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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

The "high variation" note for North America is not a throwaway line. Within the United States alone, state averages span roughly 10 points — from the mid-90s to the mid-100s — for the very same reasons that separate countries.

Average IQ by State - All 50 US States Ranked 2026

Average IQ by state, ranked for all 50: Massachusetts leads at 104.3 and Mississippi is lowest at 94.2, with a US average near 98. See where your state lands and what the numbers really mean.

Average IQ by US State and County: What Data Shows

State IQ tables are estimates, and there is no official IQ ranking for US counties. Learn which assessments report state or district results, how Census county education data can be used, and why a place cannot predict an individual's IQ.

Countries With the Highest Average IQ

The highest average IQ estimates cluster in East Asia: Hong Kong, South Korea, China, Japan, Taiwan and Singapore, at roughly 104 to 107. Figures are contested.

Who Has the Highest IQ in a Country? The Evidence Problem

No country maintains a verified public ranking of individual IQ scores. Ethiopia and Kenya illustrate why viral names and national averages cannot establish who has the highest IQ.

What Is the Average IQ in the World?

Every IQ test is normed so its population averages 100, yet cross-country estimates put the global average human IQ around 82 to 90 — here is why they differ.

Countries With the Lowest Average IQ

The lowest scores in one 2025 online IQ dataset range from 83.84 to 89.57, but they are not national measures of innate intelligence. See the data, sample sizes, and limits before comparing countries.

What Is the Average IQ of a Person?

The average IQ of a person is 100 on modern deviation-IQ scales, and about two-thirds of scores fall from 85 to 115. Here is what average really means and how to read your result.

Average IQ in Africa

Average IQ in Africa cannot be reduced to one reliable continent score. Compare recent online results with research limits, education context, and responsible interpretation.

IQ Range and Scale by Age: Full Chart

IQ scores are age-adjusted: 100 is the normed midpoint at every age. This chart explains age bands, percentiles, test coverage, and why raw scores are different.

What Is a Normal / Average IQ Score and What It Means

A normal IQ score is usually about 85–115, with 100 as the normed midpoint. Learn what average means, how percentiles work, and why one score is not a verdict.

IQ Range and Scale for Adults

For adults, modern IQ scales center at 100 with a 15-point standard deviation: 85–115 is the broad average range, 70–84 is below average, and 116–130 is above average.

Average IQ in the United States: How the US Compares

The average IQ in the United States is commonly estimated near 98, where the global mean is set to 100. Here is where the number comes from and why it is shaky.

Average IQ of Students: What the Number Really Means

There is no single average IQ for all students. IQ tests are normed by age, while school assessments measure learned skills. Learn what student IQ scores mean, how they are tested, and why grades are not the same thing.

Average IQ in Malaysia: What the Data Actually Measures

There is no single official average IQ for Malaysia. Separate popular estimates from OECD PISA evidence, see the 2022 student results, and learn why an education score cannot be converted directly into an IQ.

Average IQ by Continent and Region: How to Read the Data

There is no scientifically settled average IQ for each continent. Compare what regional education data can show, why country samples cannot simply be averaged, and how to avoid treating a group statistic as an individual prediction.

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

What Is the Average IQ Score? Meaning Explained

The average IQ score is 100 by definition, and about two in three people fall between 85 and 115. Here is what that means for where you stand.

IQ Distribution and Standard Deviation Explained

IQ scores follow a bell curve with a mean of 100 and a standard deviation of 15: about 68% score 85-115, 95% score 70-130, and 99.7% fall between 55 and 145.

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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

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

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.

What Determines Your Individual IQ?

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

Average IQ for Adults: What's Normal by Age?

The average IQ for adults is 100 at every age because IQ tests are age-normed. See the normal range and how fluid vs crystallized intelligence shift with age.

Average IQ of Doctors: How Smart Are Physicians?

The average IQ of doctors is estimated at roughly 120-130, among the highest of any profession — here's where that estimate comes from and its limits.

Average Musical IQ: What Musical Intelligence Does—and Does Not—Measure

There is no single musical IQ score. Musical aptitude, music perception, and general intelligence overlap modestly but measure different abilities, and training does not guarantee a higher IQ.

Average IQ of Scientists: How Smart Is the Profession?

The average IQ of scientists is estimated at roughly 125-135, among the highest of any profession. Anne Roe's 1952 study of eminent scientists found a median near 137, but these are estimates and creativity matters as much as raw IQ.

What Is the Average Data Scientist IQ?

There is no representative IQ census for data scientists. A large self-selected test dataset reports 119.66, while occupational research supports a high-complexity profile without proving one exact average.

Average IQ: Male vs Female — Is There a Difference?

On general intelligence there is no meaningful difference: average IQ is about 100 for both men and women. Small gaps show up only in specific abilities, and the variability question is still debated.

Average IQ in Nigeria: What the Estimates Really Show

Published datasets put the average IQ in Nigeria in the low-to-mid 70s, but these figures are heavily contested, drawn from small unrepresentative samples, and reflect schooling, nutrition and health, not innate ability.

Average IQ in Israel: What the Estimates Really Show

The average IQ in Israel is usually estimated in the low-to-mid 90s (world mean 100), but these contested figures reflect sampling and schooling, not ability.

The Average IQ of a Dolphin: How Smart Are They Really?

Dolphins have no true IQ score, but by the yardsticks scientists actually use, brain-to-body ratio, the mirror test, tool use, and named calls, they rank among the smartest animals on Earth, just behind great apes.

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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

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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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Average IQ, broken down by group, job, and place

Looking for a specific breakdown? These go deeper on how "average IQ" plays out for particular ages, professions, countries, and even animals.

By age and generation: teenagers, adults, Gen Z, 10-year-olds, birth month effects
By sex and age: IQ score by age for men, IQ scale by age for women, children and teenagers ages 10–16, male versus female IQ evidence
By profession: doctors, nurses, lawyers and attorneys, engineers, teachers, police officers, the full profession ranking, military branch selection and cognition, medical specialties and cognitive demands, neurosurgeons, physicists, programmers, Navy SEALs, pilots, accountants, scientists, CEOs, electricians
By education: average IQ by education level, average IQ of Indian students, IQ levels and range in India, IQ chart and range for kids by age, bachelor's degree evidence, PhD holders, average IQ by college major
By assessment: Wechsler Full-Scale IQ and the mean-100 scale, WAIS explained, WISC explained
By statistics: standard normal distribution of IQ scores, average IQ versus median IQ, what an IQ score means
By personality: MBTI personality type and IQ evidence, which MBTI type has the highest IQ?, zodiac sign and IQ evidence, musical intelligence and IQ evidence
By politics: Democrat versus Republican IQ claims and what research shows
By sport: sports expertise and IQ evidence
By social context: social class and cognitive performance
By country: United States, Canada, Russia, Mexico, China, Australia, Ireland, Turkey, South Africa, Ethiopia, South Korea, Singapore, Germany, Indonesia, Haiti, Palestine, Brazil, Poland, India, Japan, Philippines, United Kingdom, Somalia, Ukraine, Kazakhstan, Kenya, Korea, Bulgaria, Jamaica, Norway, Egypt, Jordan, Romania, Pakistan, Vietnam, the world average, and Europe overall
By social category: what data can and cannot tell us about the average IQ of white people
By comparison method: average IQ by race and what the data can actually show
By internet culture: the IQ chart meme and what its bell curve does—and does not—mean
By religion: average IQ by religion and what research can show, why there is no single worldwide average IQ of Muslims
By Hispanic origin: what the evidence can tell us about average IQ of Hispanic people
By generation: average IQ by generation and birth year, average IQ over time and the Flynn effect
By species (for fun): dolphins, gorillas, chimpanzees, monkeys, dogs, cats, elephants, octopuses, crows, pigs

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.