The short answer: standard classification tables consider 120 and above "superior" and 130 and above "very superior."
Before looking at these numbers, though, one thing must be said: these thresholds do not exist in nature. They are arbitrary boundaries set by humans for convenience.
Why Thresholds Are Arbitrary
IQ distribution is continuous. That means scores spread smoothly along a line; nature has no boundary line between 129 and 131.
There is no measurable qualitative difference between someone who scores 129 and someone who scores 131. The difference falls well within the test's margin of error—the same person could score on the other side on a different day.
Even so, categories are useful because they make communication easier. You just shouldn't mistake a category boundary for a real threshold.
Classifications and Percentiles
| Range | Label | Population Share | Approximate Percentile |
|---|---|---|---|
| 145+ | Very Superior / Exceptional | 0.1% | Top 1 in 1,000 |
| 130-144 | Very Superior | 2% | Top 2% |
| 120-129 | Superior | 7% | Top 9% |
| 110-119 | High Average | 16% | Top 25% |
| 90-109 | Average | 50% | Middle half |
The right column is more intuitive: a score of 120 means scoring higher than roughly nine out of ten people. A score of 130 means higher than forty-nine out of fifty people.
The Problem with the Word "Smart"
In everyday language, someone we describe as smart typically grasps concepts quickly, speaks well, makes interesting connections, and knows a lot of things.
Some of these traits are measured by IQ tests, while others are not:
- What is measured: Abstract reasoning, pattern recognition, working memory, processing speed, verbal comprehension.
- What is not measured: Creativity, social intelligence, practical problem solving, domain expertise, persistence, curiosity.
That is why asking "what IQ makes someone smart" conflates two different ideas. An IQ test measures a specific set of abilities, whereas "smart" is a much broader and looser cultural label.
We discussed whether intelligence is a single trait in our article on what intelligence is and how it is measured.
What a High Score Predicts—and What It Doesn't
A balanced view is essential: high general mental ability is a real advantage. It speeds up learning, simplifies processing complex information, and correlates measurably with academic and job performance.
However, the strength of that connection is weaker than popular narratives suggest. In recent years, these predictions have been actively re-examined.
The most informative data comes from an eighty-year longitudinal study started in the 1920s. About 1,500 children with IQs above 135 were tracked throughout their lives. As a group, they achieved higher education and income levels than the general population—yet they did not produce the groundbreaking figures of their era. We detailed this in our post on whether high IQ brings success.
Common Traits Observed in High Scorers
These are not direct results of the score itself, but rather tendencies that often accompany it:
- Fast learning and understanding with minimal repetition
- An inclination toward abstract and conceptual thinking
- Intense and highly focused interests
- Getting bored quickly with routine and repetition
- Questioning authority and accepted assumptions
- Difficulty finding common interests with peers (especially in childhood)
The last two items on this list serve as a reminder that a high score is not always an advantage. For a detailed list, check our post on common traits of people with high IQ.
Is Genius a Separate Category?
"Genius" is not an official test category. No standardized IQ test assigns a "genius" label.
Retrospective IQ estimates given to historical figures are largely speculation—most of those individuals never took a test. These numbers were generated retroactively from biographical data. We covered this topic in our articles on what a genius is and Einstein's IQ.
Why Knowing the Threshold Matters
In practice, knowing these thresholds serves a few purposes:
- Mensa membership: Typically requires scoring in the top 2%, which is roughly 130. What is Mensa?
- Gifted education programs: Thresholds vary by country and program; in Turkey, BİLSEM operates with its own evaluation process.
- Clinical evaluation: Diagnostic thresholds exist at lower boundaries, but diagnosis is never based on a score alone.
Outside of these contexts, threshold information serves little purpose beyond satisfying curiosity.
If you want to get a rough idea of where you stand, you can take our free IQ test.
Frequently Asked Questions
Is an IQ of 128 good?
Yes. It sits near the top of the superior range and represents a score higher than roughly 97% of the population.
Is an IQ of 110 considered smart?
It falls into the "high average" classification category, higher than roughly three out of four people. Whatever label is used, it is an advantageous position.
Are people with high IQs happy?
Research shows no strong correlation between test scores and life satisfaction. A high score opens some doors, but it can also bring distinct challenges.
Can I increase my score?
Some components can change with education and environment, while others remain quite stable. We reviewed the evidence in our article on how to increase your IQ.