IQ of 138: What Does a Score of 138 Mean?

Is an IQ of 138 gifted?

Yes. 138 is solidly inside the gifted range, which conventionally begins at 130. Across most educational and clinical systems, "gifted" starts two standard deviations above the mean — that is 130 on the Wechsler and Stanford-Binet scales. A 138 clears that line by eight points, putting you not at the doorway of the gifted band but well inside it.

On the WAIS-IV, scores of 130 and above were classified as "very superior." Newer editions have shifted toward more neutral wording such as "extremely high," but the boundary itself has not moved: 138 falls in that top category on every current Wechsler edition. Some gifted-education programs draw a further internal line around 130–144 for "moderately gifted" versus higher bands, and 138 sits in the upper part of that moderately-to-highly gifted zone.

One thing worth being clear about: "gifted" is a statistical label about where your score falls, not a verdict on your worth, your work ethic, or how your life will turn out. It tells you that your measured reasoning ability is rare. It does not tell you what you will do with it.

Does an IQ of 138 qualify for Mensa?

Yes, easily. Mensa admits the top 2% of the population, and 138 is well past that line. Mensa's requirement is a score at or above the 98th percentile on an approved intelligence test. On the Wechsler scale that percentile corresponds to 130, and on the Stanford-Binet it is 132. A 138 sits at roughly the 99.4th percentile — comfortably above either threshold — so it clears Mensa's bar with room to spare.

A common point of confusion is that different tests use different-looking numbers for the same cutoff. The reason is the standard deviation each test is built on:

All three of those numbers mark the same 98th percentile — they are just different rulers measuring the same height. So whether your 138 came from a Wechsler-scaled test or another SD-15 instrument, the practical takeaway is the same: it is above the Mensa line. The catch is that Mensa only accepts scores from tests it has approved and that were properly administered and supervised. A high score from a quick online quiz, including our own free test, is a strong signal but is not accepted by Mensa as proof of eligibility — for that you need to sit one of their approved supervised tests.

What does an IQ of 138 mean in practice?

In practical terms, a 138 means your capacity for abstract reasoning, pattern recognition, and learning new material quickly is rare. On average, people at this level tend to pick up complex ideas faster, hold more moving parts in working memory, and see structure in problems that others find opaque. In large studies, higher IQ correlates with outcomes like academic achievement, job performance in cognitively demanding roles, and years of education completed.

But "correlates with" is doing a lot of work in that sentence, and this is where honesty matters. IQ is one of the better single predictors psychologists have, yet it still explains only a fraction of the variation in real-world success. Plenty of people with a 138 lead perfectly ordinary careers, and plenty of people with average scores build extraordinary ones. Traits that a number cannot capture — persistence, conscientiousness, social skill, luck, timing, and simple opportunity — often matter as much or more once you are past a basic threshold. A 138 opens doors of ability; it does not walk through them for you.

There is also a real emotional side to a score like this. Some people who land in the gifted range describe feeling out of step with peers, or a pressure to "live up to" a number. If that resonates, it is worth remembering that the score is a snapshot of one kind of reasoning on one day, not an identity to carry.

How accurate is a single IQ of 138?

Here is the caveat almost no score report spells out: your true ability is best read as a range, not a single point. Every IQ test carries measurement error. High-quality tests like the WAIS-IV are very reliable — internal-consistency reliability around .98 — but even they have a standard error of measurement of roughly 2 to 3 points, and the 95% confidence interval around a single observed score is about ±5 points.

In practice, that means a measured 138 is best understood as "true score most likely somewhere in the low 130s to low 140s." Retake the test a few weeks later and a 135 or a 141 would be completely consistent with the same underlying ability — nothing changed about you, that is just the normal wobble of measurement. This is exactly why chasing the gap between a 138 and a 140 is not worth your energy: the difference is smaller than the error bar on either number. It is also why any single online result, ours included, should be read as an estimate that points to a range rather than a verdict carved in stone.

Frequently asked questions

Q: Is an IQ of 138 good?

A: Yes, it is a high score — around the 99th percentile. It means you scored higher than roughly 99 out of every 100 people, placing you well inside the gifted range and clear of the Mensa cutoff. In everyday terms it signals rare reasoning ability, though it does not by itself determine any life outcome.

Q: How rare is an IQ of 138?

A: About 1 in 175 people. A 138 sits at roughly the 99.4th percentile, meaning only about 0.6% of the population scores that high or higher on a standard SD-15 test.

Q: Is 138 IQ genius level?

A: It is at the edge of what people used to call "genius," but not by the old definition. The historical "genius" label was pinned to 140 and above, so a 138 sits just below it. Modern psychologists rarely use the word "genius" at all, since it has no fixed cutoff; 138 is best described as "gifted" or "very superior."

Q: What is the difference between an IQ of 138 and 140?

A: Almost nothing meaningful. Two points at this level is smaller than the typical measurement error of a single test, so a 138 and a 140 point to essentially the same underlying ability. The 140 gets more attention only because it is a round number tied to the old "genius" label.

References

• IQ classification — Wikipedia
• Mensa International — Wikipedia
• Whitaker, S. — Error in the estimation of intellectual ability (University of Huddersfield Repository)

Last updated: July 13, 2026