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IQ scores follow a normal distribution with a mean of 100 and a standard deviation of 15. This means each 15-point step up or down represents one standard deviation from the average — a statistically significant jump in cognitive performance relative to the general population.
Here is the full IQ classification chart used by most modern psychometric assessments:
| IQ Score Range | Classification | Population % |
|---|---|---|
| 145+ | Profoundly Gifted | ~0.1% |
| 130–144 | Very Superior / Highly Gifted | ~2.2% |
| 120–129 | Superior | ~6.7% |
| 110–119 | High Average | ~16.1% |
| 90–109 | Average | ~50% |
| 80–89 | Low Average | ~16.1% |
| 70–79 | Borderline | ~6.7% |
| Below 70 | Extremely Low | ~2.2% |
An IQ of exactly 100 means you performed at the median level for your age group — exactly half the population scored higher, and exactly half scored lower. This is entirely normal and does not imply anything negative about your intelligence, creativity, or ability to succeed. Many highly accomplished people throughout history scored in the 95–110 range.
The "average" label is a statistical term, not a judgment. Most everyday tasks, careers, and social challenges are well within the capacity of someone scoring 90–110.
A score of 115 places you in the top 16% of the population — one standard deviation above average. This is the typical range for most college graduates and professionals. People in this range tend to learn new material quickly, perform well in analytical roles, and handle complex multi-step problems with relative ease.
At 130, you're in the top 2% of the population. This is the traditional cutoff for Mensa membership and represents a very high level of cognitive ability. Scores in this range are common among medical doctors, scientists, lawyers, and senior academics. Problem-solving speed, working memory, and abstract reasoning are typically exceptional at this level.
IQ 120 places you in the top 9% of the population — solidly in the "Superior" range. This is a strong score associated with high academic achievement and success in intellectually demanding careers. The jump from 115 to 120 represents a meaningful increase in problem-solving capacity.
A score of 140 is genuinely rare — fewer than 1 in 250 people achieve it. This is the traditional "genius" threshold in popular culture, though psychologists prefer the term "highly gifted." Individuals at this level often experience intellectual isolation as much as advantage: the world is simply not calibrated for the pace at which they process information.
While verified IQ scores for public figures are rarely published, psychologists and historians have made estimates based on biographical evidence:
These figures should be taken as rough approximations. IQ tests were not standardised in their current form until the 20th century, and retrospective estimates carry significant uncertainty.
Most gifted education programmes use a cutoff of IQ 130 (top 2%). Some use 125, others 135 — there is no universal standard. What is consistent is that giftedness is defined statistically, not qualitatively: it simply means performing significantly above average on validated cognitive assessments.
No. IQ is one of the strongest predictors of academic performance and certain professional outcomes, but it does not predict emotional resilience, creativity, leadership, or life satisfaction. Research consistently shows that above an IQ of around 120, additional increases in IQ provide diminishing returns for real-world success — other factors like conscientiousness, emotional intelligence, and drive become more important.
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