What Is the Average IQ in the World? (2026 Global Averages)

Few statistics spark as much curiosity as the average IQ in the world—a number that many people assume they know but few can back up with data, though the global average is standardized at 100 and scores vary significantly by country, age, and even over time, according to data from the International IQ Test (test platform). This article breaks down the latest 2026 rankings and explores what IQ scores really reveal—and what they don’t.

Global average IQ: 100 · Highest average IQ (Hong Kong): 107.73 · Flynn effect: ~3 points per decade · Scores rising globally since 1930s: Confirmed

Key IQ statistics are summarized below.

What is the average IQ by country?

Source data is not uniform, but the pattern is clear: East Asian nations consistently report the highest averages. Hong Kong tops most 2026 rankings at 107.73, according to World Population Review (data aggregator). South Korea (106.97) and China (106.48) follow closely.

Top countries by average IQ

• Hong Kong: 107.73 (World Population Review (data aggregator))
• South Korea: 106.97 (World Population Review (data aggregator))
• China: 106.48 (Binance Square (community data))
• Japan: 106.30 (Dailyhunt Newspoint (news aggregator))

The implication: East Asian educational systems and nutrition may contribute to these scores, but cultural familiarity with IQ test formats cannot be ruled out.

Average IQ in Europe vs Asia

Asian countries occupy the top slots, while European nations like Finland and Germany typically hover near 100. The gap likely reflects decades of social investment in education and a lower prevalence of childhood malnutrition in East Asia, though the Brookings Institution (think tank) notes that the Flynn effect has slowed or reversed in many Western countries since the 1990s.

How IQ scores are collected across countries

Most international rankings rely on aggregated data from online test platforms and academic studies. The 2026 dataset from International IQ Test drew from over 1.35 million test takers, according to the platform’s own reporting. But these samples are self‑selected and may not represent entire populations.

What is the average IQ of females in the world?

One of the most consistent findings in intelligence research is that there is no meaningful average difference between male and female IQ. A review by ScienceDirect (academic publisher) confirms minimal variation—males score about 1–4 points higher on spatial tasks, but these differences are small and often offset by advantages in verbal domains.

Average IQ scores by gender

• Global average IQ for both sexes: 100
• Males: slight edge in spatial reasoning (~1–4 points) per ScienceDirect
• Females: slight advantage in verbal tasks (comparable magnitude)

The catch: any within‑sex variance is far larger than between‑sex differences, so gender is a poor predictor of individual cognitive ability.

Historical trends in gender IQ differences

Earlier studies once reported larger gaps, but as education became more equal and test designs improved, those gaps narrowed. The pattern: when environmental factors are controlled, sex differences in general intelligence all but disappear.

What is the average IQ by age?

IQ does not stay flat across a lifetime. Research from the National Center for Biotechnology Information (U.S. federal research database) shows that IQ typically peaks in the late teens or early 20s, then slowly declines after age 30.

IQ changes over a lifetime

• Peak cognitive performance: late teens to early 20s (NCBI)
• Gradual decline starting around age 30
• Fluid intelligence (problem‑solving) declines faster than crystallized intelligence (knowledge)

What this means: average IQ by age is not a single number but a curve. For the overall adult population, the mean remains 100 because the standard test norms are periodically re‑centered.

Average IQ for adults vs children

Children’s IQ scores are age‑adjusted. A 10‑year‑old who scores 100 is at the average for 10‑year‑olds. The raw score would be much lower than an adult’s, but the normalized IQ is comparable. No single “adult IQ” or “child IQ” exists—the scale is relative to each age group.

“The global average IQ is standardized at 100 across populations.”

— International IQ Test (test platform)

“Hong Kong has the highest average IQ in the world at 107.73.”

— World Population Review (data aggregator)

“In developed nations, the Flynn effect has slowed or reversed since the 1990s.”

— Brookings Institution (think tank)

The data tells a consistent story: the world’s average IQ is 100, but that number masks enormous variation by geography, age, and test methodology. The Flynn effect shows that environments—schooling, nutrition, complexity of daily life—profoundly shape scores. For policymakers in the UK, the implication is clear: investing in early‑childhood education and healthcare remains the most reliable way to sustain cognitive gains, or risk falling behind as the Flynn effect flattens. For broader global rankings, see Who Is the Richest Person in the World.

Understanding how intelligence scores shift across different life stages can be explored in more detail through our guide on average IQ by age, which breaks down norms and ranges for each age group.

Frequently asked questions