What Does an IQ of 120 Mean? Percentile, Rarity and the “120 Myth”
An IQ of 120 puts you at about the 91st percentile, comfortably in the Superior range and ahead of roughly 9 in 10 people. You may also have come across the claim that intelligence “stops mattering” somewhere around this number. That idea is popular, but it does not hold up well against the evidence. This guide covers exactly what 120 means, how it compares with nearby scores, and what long-running research actually found.
IQ 120 at a glance
| Measure | Value |
|---|---|
| Wechsler classification | Superior |
| Percentile | Approximately 91st |
| Standard deviations above average | +1.3 (scale: mean 100, SD 15) |
| Rarity | About 1 in 11 people (roughly 9% of the population) |
| Is it gifted or Mensa-level? | Not usually. Most gifted and Mensa cutoffs sit at 130, one full band higher |
Where 120 sits on the bell curve
An IQ of 120 is 1.3 standard deviations above the average of 100. That places it solidly inside the upper tail of the bell curve, ahead of the vast majority of people, without yet reaching the much rarer territory above 130.
120 compared with 110 and 130
A 10-point difference on an IQ scale can look small, but because the bell curve thins out quickly away from the average, it represents a real change in rarity.
| IQ score | Classification | Percentile | Rarity |
|---|---|---|---|
| 100 | Average | 50th | 1 in 2 |
| 110 | High Average | ~75th | About 1 in 4 |
| 120 | Superior | ~91st | About 1 in 11 |
| 130 | Very Superior | ~97.7th | About 1 in 44 |
| 140 | Very Superior | ~99.6th | About 1 in 261 |
Moving from 110 to 120 roughly doubles your rarity; moving from 120 to 130 roughly quadruples it again. For the full classification chart and a live percentile calculator covering any score, see our guide to what counts as a good IQ score. If you are specifically weighing up 120 against 130, our separate guide on what an IQ of 130 means covers that threshold in depth.
The “120 is where it stops mattering” myth
A popular idea holds that once you are reasonably intelligent, say around 120, extra IQ points stop making any real difference to your life. It is a comforting idea, but the best available long-term evidence does not support it.
The Study of Mathematically Precocious Youth (SMPY), a US longitudinal project running since 1971 that has tracked thousands of high-ability people for decades, tested this directly. Even when the researchers looked only within the top 1% of ability, people towards the higher end of that already-rare group were still more likely to go on to earn doctorates, hold patents or reach tenured academic positions than those towards the lower end of the same top 1%. In other words, the advantage of higher ability did not flatten out at some fixed point; it kept showing up even among people who were already exceptionally able.
This does not mean a higher IQ guarantees a better life, or that people below 120 cannot achieve great things, plenty do. It means the specific claim that ability simply stops mattering past a certain point is not well supported. Motivation, opportunity, mental health and many other factors matter throughout the whole range.
Is 120 gifted?
Usually not by itself. Most school gifted-and-talented programmes, and high-IQ societies such as Mensa, set their bar at 130, the top 2%, not 120. An IQ of 120 falls in the Superior band, one classification below Very Superior, and represents the top 9% rather than the top 2%. It is a strong, genuinely above-average result, just not typically the threshold institutions use for the word “gifted”.
What an IQ of 120 does and does not mean
An IQ of 120 tells you that, on the specific reasoning tasks the test used, you performed better than roughly 91 in 100 people. That is a genuinely strong, above-average result.
It does not, on its own, predict creativity, emotional intelligence, practical skill or how happy or successful you will be. IQ tests measure a defined set of abilities: pattern recognition, working memory, verbal reasoning and processing speed, and those are only some of the ingredients that go into a person's life outcomes.
Checking your own score
If you would like to see where you might land, the free IQScore cognitive assessment gives you an estimated score across four reasoning areas, on a simple scale from 70 to 130. As a short, unsupervised online test, treat any result as an interesting estimate rather than an official IQ. Full details of how the scoring works are on our About page.
Where would you land?
Take the free IQScore test and see your estimated score and section breakdown instantly.
More IQ guides
IQ 120: FAQs
Is an IQ of 120 good?
Yes. An IQ of 120 sits at about the 91st percentile on the standard Wechsler scale, meaning you scored higher than roughly 9 out of 10 people. It is classified as Superior, one band below the Very Superior range that starts at 130.
Is 120 IQ considered gifted?
Usually not on its own. Most gifted-programme and Mensa cutoffs sit at 130, the top 2%. An IQ of 120 is in the top 9% or so, a strong result, but typically one tier below the threshold most institutions label "gifted".
How rare is an IQ of 120?
About 1 in 11 people score 120 or above on a standard test, roughly 9% of the population. In a group of 100 people, you would expect around 9 to reach this level.
What percentile is an IQ of 120?
An IQ of 120 corresponds to approximately the 91st percentile, meaning you scored as well as or better than about 91% of the people the test was standardised on.
Is it true that IQ stops mattering after 120?
No, this is a popular myth without solid evidence behind it. The Study of Mathematically Precocious Youth, a decades-long study following thousands of high-ability people, found that differences in ability continued to predict real outcomes, such as advanced degrees and patents, even among people who were already in the top 1%. Extra ability above 120 still tends to help, on average.
What is the difference between an IQ of 110 and 120?
110 is High Average, at about the 75th percentile, roughly 1 in 4 people. 120 is Superior, at about the 91st percentile, roughly 1 in 11 people. The 10-point gap represents a meaningfully rarer result, since scores thin out quickly away from the average.
What is the difference between an IQ of 120 and 130?
120 is Superior, about the 91st percentile. 130 is Very Superior, about the 97.7th percentile, roughly four times rarer than 120. Many gifted programmes and high-IQ societies use 130, not 120, as their entry threshold.
Does an IQ of 120 mean you will be successful?
Not on its own. IQ scores measure a specific set of reasoning skills, not motivation, creativity or opportunity. Long-running research on high-ability people has found that ability helps on average, but individual outcomes vary enormously depending on many other factors.
Can I test whether I have an IQ of 120?
Only a supervised test given by a licensed psychologist can give you an official score. A free online test, including the IQScore cognitive assessment, can give you a rough, honest estimate for interest and practice, but it is not a clinical assessment.
What jobs typically need an IQ of 120?
No job formally requires a specific IQ score, and in most countries employers cannot ask for one. Certain demanding fields tend to attract people with strong reasoning skills, but training, experience and motivation matter far more than any single test result.
Sources and further reading
- Pearson Assessments. Wechsler Adult Intelligence Scale, Fourth Edition (WAIS-IV) Technical and Interpretive Manual.
- Lubinski, D., & Benbow, C. P. (2006). Study of Mathematically Precocious Youth after 35 years: Uncovering antecedents for the development of math-science expertise. Perspectives on Psychological Science, 1(4), 316–345.
- Kell, H. J., Lubinski, D., & Benbow, C. P. (2013). Who rises to the top? Early indicators. Psychological Science, 24(5), 648–659.
- Wai, J. (2017). What century-long research reveals about gifted kids. Psychology Today.
This article is provided for education and entertainment. Scores from online tests, including IQScore, are estimates and are not a clinical or diagnostic result. If you have concerns about learning, memory or thinking, please speak to a qualified professional.
