Ask ten people what a good IQ score is and you will probably hear ten different numbers. Some will say anything over 100, others will insist you need 130 to count as "smart." The truth is simpler and more interesting: an IQ score only makes sense once you understand the curve it sits on.
This guide walks you through that curve, what the common score ranges mean, and how to think about your own number in a healthy, realistic way.
IQ is a comparison, not a raw grade
An IQ score is not like a percentage on a school exam. You do not get 100 by answering 100 questions correctly. Instead, your performance is compared with a large reference group of people your age, called the norm sample.
Modern IQ tests are built so that the average score in that group is set to 100, and the spread of scores is set so that one standard deviation equals 15 points. That design choice is what makes scores comparable across different tests and different years.
So when someone scores 115, it does not mean they got 15 extra answers right. It means they scored one standard deviation above the average person in their age group.
The bell curve, in plain language
When you plot the IQ scores of a large population, they form a symmetrical, bell-shaped curve, known as the normal distribution. Most people cluster near the middle, and fewer and fewer people appear as you move toward either extreme.
Because the curve follows predictable math, we can say with confidence how scores are distributed:
- About 68% of people score between 85 and 115 (within one standard deviation of the mean).
- About 95% score between 70 and 130 (within two standard deviations).
- Only about 2% score 130 or above, and roughly the same share score 70 or below.
In other words, "average" is not a narrow point. It is a wide band that includes most of the people you know.
IQ score ranges and percentiles
A percentile tells you what share of people in the norm group you scored higher than. This is often the most intuitive way to read a result.
| IQ score | Approximate percentile | How it is commonly described |
|---|---|---|
| 145 | 99.9th | Very high |
| 130 | 98th | Very high / gifted range |
| 120 | 91st | High |
| 115 | 84th | High average |
| 100 | 50th | Average |
| 85 | 16th | Low average |
| 70 | 2nd | Very low |
The exact labels vary between test publishers. One test might call 120 to 129 "superior," while another uses "high." The numbers and percentiles are the part that actually carries meaning.
So, what counts as a "good" IQ score?
It depends on what you mean by good. Here are three honest ways to answer the question:
- Statistically: any score from about 90 to 110 is squarely average, and anything above 110 is above average. A score of 100 is, by definition, exactly typical.
- Practically: a score in the average range is fully compatible with a successful education, career and life. Most people who do well in the world are not statistical outliers.
- Selectively: some groups use cutoffs. High-IQ societies such as Mensa, for example, admit people who score in the top 2% on an approved test, which corresponds to about 130 on a scale with a standard deviation of 15.
If you score above 115, you outperformed roughly five out of six people your age on that test. That is a strong result by any reasonable standard.
Why your score is a range, not a single point
Every test has some measurement error. Your result on a given day can be nudged by sleep, stress, unfamiliarity with the format, or simply a lucky or unlucky guess. Professional assessments acknowledge this by reporting a confidence interval, a band of several points around your score where your "true" ability most likely sits.
That is why it is wise to think of a 112 and a 117 as overlapping, rather than as meaningfully different people. Small gaps between scores rarely tell you much.
It also helps to know what kind of test you took. A full clinical assessment such as the WAIS is administered one-on-one by a trained psychologist and samples many different abilities. An online test is a useful, convenient estimate, but it is not a diagnosis. If you are curious how these instruments are designed, our guide on how IQ tests work breaks down the puzzles and the scoring.
Average scores have shifted over time
One surprising wrinkle: the raw performance that earns a score of 100 has not stayed fixed. Throughout much of the 20th century, average performance on IQ tests rose steadily in many countries, a pattern known as the Flynn effect. The gains were roughly three points per decade on many tests.
This is one reason tests are re-normed every so often. Without fresh norms, an old test would make a modern population look artificially bright. Researchers still debate the causes, with better nutrition, more schooling and more abstract everyday environments among the leading explanations. Some recent data suggest the trend has slowed or even reversed in places.
What an IQ score can and cannot tell you
IQ scores are among the most studied measures in psychology. Research consistently finds that they predict, on average, outcomes such as academic performance and success in complex jobs. But "on average" is doing a lot of work in that sentence.
What an IQ score does reasonably well:
- Estimates your current reasoning, problem-solving and pattern-recognition ability.
- Compares that ability with other people your age.
What it does not measure:
- Creativity, curiosity or practical wisdom.
- Emotional skills, motivation or persistence.
- Your worth as a person or your ceiling for learning.
Plenty of what shapes a fulfilling life sits outside the test entirely. And while your score tends to be fairly stable in adulthood, it is not a fixed verdict. Education and experience matter, as we explore in can you increase your IQ?.
The bottom line
A "good" IQ score is less about clearing a magic number and more about understanding where you sit on the curve. Scores between 85 and 115 cover most people, 115 and above is clearly above average, and 130 and up is rare. Treat any single result as an estimate with a margin of error, not a label.
Curious where you land? You can take our free IQ test in a few minutes and see your score alongside an approximate percentile.
FAQ
Is 110 a good IQ score?
Yes. A score of 110 sits around the 75th percentile, meaning you scored higher than about three quarters of people your age. It falls at the upper edge of the average range.
What IQ score is considered genius?
There is no official "genius" cutoff in psychology. Scores of 130 and above are often described as very high or gifted, and they represent roughly the top 2% of the population.
Can an online IQ test give an accurate score?
A well-designed online test can give a reasonable estimate of your reasoning ability, especially for pattern-based puzzles. It is not a substitute for a clinical assessment administered by a qualified psychologist.
