Short answer: 85 to 115 is considered normal. In a narrower definition, 90–109 is called "average."
Reading these numbers without knowing where they come from can be misleading. That is because "normal" here does not mean what it does in everyday language.
Normal does not mean good — it means middle
In everyday language, "normal" is a quality judgment: if it is normal, there is no problem.
In IQ testing, normal is purely a statistical term. It simply means being close to the center of a distribution. It is not an evaluation of worth, but a statement of position.
This distinction matters because "below normal" sounds like a diagnosis. By definition, a certain percentage of the population will always fall below average. This is not a sign of a problem, but a result of how the scale is designed.
Where the numbers come from
Modern IQ tests scale results to have a mean of 100 and a standard deviation of 15. These two numbers are chosen values — a measurement convention, not a law of nature.
Standard deviation shows how spread out the distribution is. In a normal distribution, these proportions are fixed:
| Range | Standard deviation | Share of population |
|---|---|---|
| 85 – 115 | ±1 | 68% |
| 70 – 130 | ±2 | 95% |
| 55 – 145 | ±3 | 99.7% |
So the "normal range" of 85 to 115 actually includes two out of every three people. It is not a coincidence that it is this broad — that is the very definition of normal.
What your score actually tells you
An IQ score tells you your ranking within your age group. It is not an "amount of intelligence."
- 100: You are right in the middle of your age group. About half of your peers score higher, and half score lower.
- 115: Higher than about 84% of your peers.
- 85: At the boundary of the lowest 16%.
- 130: In the top 2%.
This leads to an important point: because scores are normed by age, 100 is normal at any age. It is the same for a 10-year-old child as it is for a 45-year-old adult. We detailed this topic in our article on what IQ should be by age.
The limits of relying on a single number
The most overlooked point here: no IQ score is an exact value.
In professional evaluations, scores are given with a confidence interval rather than a single number — for example, "108, with a 95% confidence interval of 102–114." This reflects the margin of error inherent in measurement.
In practical terms, the difference between 104 and 111 may not be a real difference. The same person taking the same test on a different day could score differently.
Everyday factors can also affect your score:
- Sleep quality — a single bad night can cause a measurable drop
- Anxiety levels
- Familiarity with the test format
- How recently the test norms were gathered
- Motivation and general state of mind on that day
Do online tests accurately reflect this range?
Partially. The vast majority of online tests do not rely on age-specific norm tables like clinical tests do. Most generate scores based on an assumed general distribution.
This does not mean the resulting number is completely meaningless — but it should not be read as an exact figure. We discussed the limits of online tests in detail in this article.
If you want a rough idea of where you stand, you can take our free IQ test and interpret the result using the framework above.
Full list of IQ ranges
Although classifications vary slightly from test to test, here is the commonly used table:
| Range | Classification |
|---|---|
| 130+ | Very superior |
| 120–129 | Superior |
| 110–119 | Above average |
| 90–109 | Average |
| 80–89 | Below average |
| 70–79 | Borderline |
| Below 70 | Very low |
We explored what each range means and its practical implications in our guide on what an IQ score should be.
Frequently asked questions
Is an IQ of 95 low?
No. The 90–109 range is classified as average, and about half of the population falls into this bracket. A score of 95 simply indicates a position just below the exact midpoint.
At what score is IQ considered "high"?
Generally, scores from 120 upward are considered superior, and 130 and above very superior. However, these thresholds are conventional; there is no qualitative difference between 129 and 131.
What does a score below 70 mean?
It is not a diagnosis on its own. Assessing an intellectual disability requires evaluating adaptive behavior alongside IQ scores and must be performed by a specialist. You can check our article on what low IQ means.
Why is my score different on every test?
This is expected. Measurement error, differences between tests, and day-to-day fluctuations combined can cause a shift of several points. We explained how different tests vary in our article on types of IQ tests.