IQ 90–109

Average

An IQ of 90–109 is the Average range — the middle 50% of the population. By definition, this is the most common IQ classification. Half of all people score here.

Score Band
IQ 90–109
Standard scale (mean 100, SD 15)
Percentile
25th–75th
Position in the population
Population
50%
Rarity: 1 in 2
Where Average sits on the bell curve

About the Average range

What an average IQ score actually means

The Average range (IQ 90–109) is not a consolation prize — it is, by definition, where most people score. IQ tests are normed so that exactly 50% of the population scores between 90 and 109. If you score here, you are cognitively typical.

This range covers an enormous span of real-world outcomes. People with IQs of 90 and 109 both fall in "Average," but a 19-point difference is substantial in practice. The range is wide, and where you sit within it matters.

What the research says about average IQ

Research on IQ and life outcomes shows that people in the average range have lower average educational attainment and occupational status than those above 110, but the distributions overlap enormously. Many people in the 90–109 range work in highly skilled trades, management, healthcare, and other demanding fields.

The most important finding: conscientiousness (the personality trait related to self-discipline and reliability) predicts job performance as well as IQ does for most occupations. An average-IQ person with high conscientiousness typically outperforms a high-IQ person with low conscientiousness.

The "average" label problem

In everyday language, "average" often implies mediocrity. In psychometrics, it simply means the middle of the distribution. If you score 100, you are cognitively average — meaning half of all people score lower than you, and half score higher.

IQ is one measure of one set of cognitive abilities. It says nothing about your creativity, emotional intelligence, wisdom, practical skills, or drive. Many of the most respected people in any community score in the average range. Many high-IQ individuals achieve very little. The number is a data point, not a verdict.