Average IQ in Johannesburg (South Africa): Estimates & Key Factors
Estimated Avg IQ
90
IQ Range
87–93
Region
Middle East & Africa
Johannesburg is sub-Saharan Africa's largest city by economic output and the financial center of the African continent. The University of the Witwatersrand (Wits) is South Africa's most research-intensive university and among the continent's most prestigious. Johannesburg concentrates South Africa's financial, mining, and technology sectors, creating significant demand for educated professionals. South Africa's national average reflects historical inequality in educational access from the apartheid era, but Johannesburg's urban population has much higher average educational attainment than the national figure suggests, with a large professional class driving the urban premium.
Important note: City-level IQ estimates are especially approximate. They reflect selection effects — cities attract educated, ambitious migrants — as well as local education quality, economic conditions, and available data. These figures do not reflect the intelligence or potential of any individual resident. For context on what IQ scores measure, see our guide to IQ.
Key Factors Shaping IQ in Johannesburg
- •Sub-Saharan Africa's largest economy and financial center
- •University of the Witwatersrand is among Africa's most research-intensive institutions
- •Mining, finance, and technology sectors require highly educated professional workforce
- •Urban selection effects from large professional class with above-average educational attainment
To understand what IQ scores measure and how they're calculated, see our guide on what IQ is. For a breakdown of what different score levels mean, visit our IQ score ranges page.
Johannesburg vs. South Africa National Average
Cities typically score above national averages due to selection effects — highly educated and ambitious individuals tend to migrate toward economic and cultural capitals. Johannesburg's estimated average IQ of 90 reflects this urban premium above South Africa's national average.
Frequently Asked Questions
What is the average IQ in Johannesburg?
Johannesburg's estimated average IQ is around 90, substantially above South Africa's national average of approximately 77. The city's financial sector, mining industry, and concentration of South Africa's most educated professionals create a meaningful urban premium.
How does historical apartheid affect Johannesburg's educational landscape today?
Apartheid-era educational segregation created lasting inequality in school quality between formerly white and formerly black areas. While significant progress has been made, school quality remains highly variable, and the legacy of unequal access to quality education continues to affect population-level cognitive test outcomes.
How does Johannesburg compare to Nairobi and Cairo?
Johannesburg (90) scores higher than Nairobi (83) and Cairo (88), reflecting South Africa's higher national income and educational investment. However, South Africa's unique historical inequalities create a particularly large gap between the professional class and broader population.
Explore More Cities
See all cities on our Average IQ by City page, or take our free IQ test to see how you compare.
MyIQScores Editorial Team
Researchers in cognitive psychology, psychometrics & educational science
Last updated
May 10, 2026
All content on MyIQScores is reviewed for scientific accuracy against peer-reviewed research in cognitive psychology and psychometrics. Our editorial team cross-references each article with published literature before publication and updates pages whenever new research warrants a revision.