— National IQ research
Average IQ in South Korea
Estimated avg IQ
106
Percentile
66th
Region
East Asia
vs world avg (82)
24 points above
Published cross-national IQ research places South Korea at an estimated national average IQ of around 106. This is a population mean estimate with wide confidence intervals — not a fixed number.
South Korea ties with Japan in most large-scale cross-national IQ studies. An intensely academic culture (the Korean concept of 'education fever') and rigorous national testing systems contribute to high measured cognitive performance.
Important caveats about national IQ averages
National IQ averages are widely cited but require careful interpretation:
- Within-country variation is enormous — typically 15-20 IQ points of standard deviation within any country, far larger than differences between countries
- Education and nutrition access are the strongest predictors of national average IQ — countries with better early childhood nutrition and schooling score higher
- Urban vs. rural gaps can be 10-15 points within the same country
- Measurement bias is real — tests developed in Western contexts may not perfectly transfer to other cultures
- Scores are rising in most countries (the Flynn effect) — estimates from 10+ years ago are already outdated
How do you compare?
Take a 20-minute IQ test and see your personal score — regardless of where you're from.
Countries with similar average IQ
- Average IQ in Japan — estimated 106
- Average IQ in China — estimated 104
- Average IQ in Hong Kong — estimated 108
- Average IQ in Taiwan — estimated 104
- Average IQ in Singapore — estimated 108
What drives differences in national IQ?
Cross-national cognitive differences are strongly predicted by:
- Per-capita spending on education, particularly in early childhood
- Childhood nutrition — iodine, iron, and protein deficiency in early years have measurable cognitive effects
- Infectious disease burden — diseases that divert metabolic resources away from brain development
- Genetic diversity — surprisingly, more genetically diverse populations tend to score higher, not lower
- GDP per capita — as a proxy for all of the above
These factors suggest that national IQ averages are highly malleable — nutrition and education interventions reliably raise them over 1-2 generations.