IQ Score Meaning - What Every IQ Number Actually Means
You just got a number back from a test, and now you are staring at it wondering whether it is good, average, or something to worry about. Here is the short answer before anything else: on the standard scale used by the major tests, the average IQ is 100, and every 15 points above or below that marks one full step away from the middle of the pack. So a score of 115 sits one step above average, 130 sits two steps above, 85 sits one step below, and the vast majority of people land somewhere between 85 and 115.
The IQ score meaning behind any single number comes from three things working together: where it falls on the classification scale, what share of the population scores lower than you (your percentile), and how far it sits from the average of 100. This page is the definitive guide to all three. Below you will find the full IQ scale from below 70 to 145 and up, a plain-language explanation of what each band means, the bell curve math that makes the whole system work, and worked examples using the three scores people ask about most: 115, 120, and 130. As of 2026, the numbers here follow the Wechsler scale (mean 100, standard deviation 15), which is the scoring system behind the most widely used professional intelligence tests.
What is the average IQ, and why is it always 100?
The average IQ is 100 by design, not by accident. IQ tests are not scored like a school exam where you count correct answers. Instead, raw results are mathematically rescaled so that the middle of the population always lands on exactly 100, and the spread of scores always has a standard deviation of 15. Whatever the raw test looks like, the final number tells you how you did relative to other people your age, not how many questions you got right.
That is why 100 is not a passing grade or a target. It is simply the center of the distribution. Half of all people score above 100 and half score below it. A score of 100 means you performed right at the typical level for your age group, which is a genuinely common and unremarkable place to be.
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The full IQ classification scale and chart
Here is the complete IQ scale from the lowest band to the highest, with the classification label, the approximate share of the population in each band, and the rough percentile range. These figures come from the normal distribution with a mean of 100 and a standard deviation of 15, which is how the Wechsler tests are built.
| IQ range | Classification | Approx. % of population | Percentile range |
|---|---|---|---|
| 145 and above | Genius / highly gifted | ~0.1% | 99.9th and up |
| 130-144 | Gifted / very superior | ~2% | 98th-99.9th |
| 120-129 | Superior | ~7% | 91st-97th |
| 110-119 | High average | ~16% | 75th-90th |
| 90-109 | Average | ~50% | 25th-73rd |
| 80-89 | Low average | ~16% | 9th-23rd |
| 70-79 | Borderline | ~7% | 2nd-8th |
| 69 and below | Extremely low | ~2% | Below 2nd |
A few things jump out of this chart. Half the population sits in the single Average band of 90 to 109, which is why most people who take a test land there. The bands are symmetrical around 100, so "Superior" at 120-129 mirrors "Borderline" at 70-79 in terms of how many people fall into each. And the extremes are genuinely rare: only about 1 person in 50 scores 130 or higher, and only about 1 in 1,000 reaches 145.
One note on labels. Modern editions of the professional tests have moved toward gentler, more neutral wording, so you may see "very high" instead of "very superior" or "extremely low" instead of older clinical terms. The score cutoffs stay the same; only the names get updated.
What each band actually means
Conclusion first: the band tells you how common your score is, not what you are capable of achieving. Here is what each range represents in plain terms.
- Genius / highly gifted (145+): Rarer than 1 in 1,000. This is the far right tail of the curve. High-IQ societies like Mensa admit people around the top 2%, so a 145 sits well beyond even that threshold.
- Gifted / very superior (130-144): Roughly the top 2%. This is the common cutoff for "gifted" programs and for Mensa membership (Mensa uses the 98th percentile). About 1 person in 50 reaches this range.
- Superior (120-129): Around the top 9%. Clearly above average, associated with strong performance in demanding academic and professional settings.
- High average (110-119): The band just above the middle. Still very common, covering roughly 16% of people.
- Average (90-109): Where about half of everyone lands. This is the statistical heart of the population and carries no cause for concern in either direction.
- Low average (80-89): The mirror image of high average below the midpoint. Common and within the normal range of variation.
- Borderline (70-79): Below most people but above the clinical threshold. Often flagged for a closer look by a professional if it appears alongside real-world difficulties.
- Extremely low (below 70): Roughly the bottom 2%. A score here, combined with difficulties in everyday functioning, is one of the criteria clinicians consider when assessing intellectual disability. A number alone never makes that determination.
The honest caveat that belongs with every band: a single IQ score is a snapshot of specific reasoning skills on one day. It does not measure creativity, emotional intelligence, work ethic, or character, and it should never be read as a ceiling on what someone can do.
The bell curve and standard deviation, explained simply
Conclusion first: IQ scores are spread out in the shape of a bell, and "15 points" is the ruler used to measure distance from the center. That ruler is called the standard deviation.
Picture a curve that is tall in the middle and tapers off on both sides. Most people cluster near the average of 100, and the further you move toward either extreme, the fewer people there are. This is the normal distribution, or bell curve, and IQ tests are deliberately engineered to produce it.
The standard deviation of 15 is what makes the scale readable. It tells you how far apart scores tend to be. Because of the fixed shape of the bell curve, the percentages that fall within each step from the center are always the same:
| Distance from average | IQ range | Share of population inside this range |
|---|---|---|
| Within 1 step (±15) | 85-115 | About 68% |
| Within 2 steps (±30) | 70-130 | About 95% |
| Within 3 steps (±45) | 55-145 | About 99.7% |
This is the single most useful fact about IQ: roughly two out of three people score between 85 and 115, and about 95 out of 100 score between 70 and 130. Scores outside 55-145 are so rare they account for only about 3 people in 1,000 combined.
One warning about very high and very low numbers. Some tests report scores using a standard deviation of 16 or 24 instead of 15, which inflates the same underlying performance into a bigger-looking number. A "150" on an SD-24 scale is not the same as a 150 on the standard SD-15 scale. Always check which scale a score is on before comparing it to the chart above.
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Percentiles: the clearest way to read your score
Conclusion first: your percentile is the share of people who score at or below you, and it is a far more intuitive way to understand a result than the raw number. An IQ of 100 is the 50th percentile by definition, meaning you scored higher than half of people.
Here are the anchor points worth memorizing:
| IQ score | Percentile | Meaning in plain words |
|---|---|---|
| 85 | 16th | Higher than about 16 in 100 people |
| 100 | 50th | Right in the middle; higher than half |
| 115 | 84th | Higher than about 84 in 100 people |
| 130 | 98th | Higher than about 98 in 100 people |
| 145 | 99.9th | Higher than about 999 in 1,000 people |
Notice something strange and important here. Moving from 100 to 115 jumps you 34 percentile points (50th to 84th). But moving from 115 to 130 jumps you only about 14 points (84th to 98th), even though both gaps are exactly 15 IQ points. That is the bell curve at work: as you climb toward the extremes, each additional point represents a rarer and rarer group of people, so the percentile gains shrink even as the number keeps rising. This is why chasing a few extra points at the top of the scale is far harder than it looks.
How to read a single score: three worked examples
Conclusion first: to interpret any one score, translate it into its band, its percentile, and its distance from 100. Here is how that works for the three numbers people ask about most.
A score of 115. This lands in the High Average band, at roughly the 84th percentile, exactly one standard deviation above the average of 100. In plain terms, you scored higher than about 84 out of 100 people. It is a clearly above-average result and comfortably common. About 16% of people score 115 or above.
A score of 120. This sits in the Superior band, around the 91st percentile, a bit past one standard deviation above average. You outscored roughly 9 in 10 people. It is a strong result associated with the top tenth of the distribution, and it sits just below the gifted threshold.
A score of 130. This reaches the Gifted / very superior band, at about the 98th percentile, two full standard deviations above the average. Only about 1 person in 50 scores this high. It is also the standard cutoff used by gifted programs and by Mensa, which admits people at or above the 98th percentile.
The pattern to take away: read the band for the label, read the percentile to know how you compare to others, and count the steps from 100 to feel how far from typical the score is. All three views describe the same result from different angles.
Every IQ score explained, number by number
Want the detail on one specific score? Each of these breaks down the exact percentile, rarity, and meaning of that number, plus how it compares to its neighbors.
- High average: IQ 113, IQ 114, IQ 115, IQ 116, IQ 118
- Superior: IQ 120, IQ 121, IQ 122, IQ 123, IQ 124, IQ 125, IQ 126, IQ 127, IQ 128, IQ 129
- Gifted: IQ 130, IQ 131, IQ 132, IQ 133, IQ 134, IQ 135, IQ 136, IQ 137, IQ 138
- Highly gifted and beyond: IQ 140, IQ 142, IQ 160, IQ 200
FAQ
Q: What is a good IQ score?
A: Anything from 90 to 109 is squarely average, and 110 or above is above average, but there is no single "good" number. Because half the population scores between 90 and 109, landing there is completely normal. Scores of 120 and up are uncommon and place you in the top 10% or higher, but a score is only one narrow measure of reasoning and does not define your potential.
Q: What percentage of people have an IQ over 130?
A: About 2% of people score 130 or higher. This is roughly the top 1 in 50, and it is the standard cutoff for gifted classification and for Mensa membership, which uses the 98th percentile. Scores of 145 and above are far rarer still, at about 1 in 1,000.
Q: Is 100 the average IQ?
A: Yes, 100 is the average IQ by design on the standard Wechsler scale. Tests are mathematically rescaled so that the middle of the population always lands on exactly 100, with a standard deviation of 15. Half of all people score above 100 and half score below it.
Q: Why do different tests give me different IQ numbers?
A: Different tests use different standard deviations and different question types, so the same ability can produce different-looking scores. The most common professional scale uses a standard deviation of 15, but some tests use 16 or 24, which inflate the number. Always check which scale a score is reported on before comparing it to a classification chart.
Q: Can I trust a free online IQ test result?
A: A quick online test is fine for a ballpark sense of where you sit, but only a supervised professional assessment gives a clinically valid number. Our own test is free to take, with detailed scoring and percentile breakdowns available as a paid result, and it is designed to place you sensibly on the standard 100-mean, 15-SD scale rather than hand out inflated numbers.
References
- American Psychological Association: Intelligence and IQ testing — overview of intelligence measurement and interpretation.
- Wechsler Adult Intelligence Scale (WAIS), Pearson Assessments — the standard adult IQ test and its scoring framework.
- Neisser et al. (1996), "Intelligence: Knowns and Unknowns," American Psychologist — landmark APA task-force report on IQ and its distribution.
Last updated: July 13, 2026
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