Average IQ by Education Level (Degree and Major): What the Data Really Shows
People often search for the average IQ by education level to compare a high-school diploma, a bachelor's degree, a master's degree, or a doctorate. Others want to know whether one college major has a higher average than another. The broad pattern is real: people who stay in education longer tend to score higher on cognitive tests. The mistake is treating a credential as if it were an IQ score printed on a diploma.
The most useful answer is therefore a careful one. Education level is associated with higher measured intelligence for two overlapping reasons: students with stronger prior preparation are more likely to continue, and schooling itself can improve some reasoning skills. Major-level comparisons add another layer of selection because different programs attract people with different interests, preparation, and admissions-test profiles. The numbers below are group estimates, not a prediction about any individual.
What does average IQ by education level actually mean?
It means that a study found different mean scores among groups defined by their highest completed education. It does not mean that every person with a degree has the same ability, or that completing a degree automatically raises a person's IQ by a fixed amount.
IQ tests are normed so that the general reference population has a mean of 100 and a standard deviation of 15. A group mean around 115 is therefore about one standard deviation above that reference mean, but the group still contains people across a wide range. Education categories also change by country, cohort, access to school, and the test used, so a figure from one sample should not be presented as a worldwide constant.
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How do the education-level estimates compare?
The table is a practical summary of ranges reported in adult test-standardization and educational-attainment analyses. It is intentionally presented as a band: the underlying samples are not a census of every graduate, and the doctorate category is especially heterogeneous.
| Highest completed education | Cautious estimate seen in research summaries | What the estimate captures |
|---|---|---|
| High school or equivalent | about 100–105 | A broad reference group with large variation in preparation |
| Associate or short-cycle degree | about 105–112 | Postsecondary study, often with mixed admission routes |
| Bachelor's degree | about 110–115 | More years of formal study and substantial selection into college |
| Master's degree | about 113–118 | Further selection plus advanced, specialized coursework |
| Doctorate | about 116–125 | A very selective and field-diverse group; estimates vary most |
These are not official IQ cutoffs. They are a way to understand the direction and approximate size of a group difference. A bachelor's graduate can score below the high-school row, and a person who never attends college can score well above the doctorate mean. The distributions overlap far more than an online ranking usually suggests.
Why does the mean rise as people earn more degrees?
There are two explanations, and both matter.
Selection comes first. Reading skill, prior achievement, family resources, health, and comfort with abstract schoolwork all affect who enrolls and who completes. A demanding program filters its applicant pool before the first class begins. The higher mean therefore partly reveals pre-existing differences in preparation and cognitive skills.
Education can also have a causal effect. A large meta-analysis by Stuart Ritchie and Elliot Tucker-Drob combined 142 effect sizes from 42 datasets and more than 600,000 participants. Across quasi-experimental designs, an additional year of education was associated with roughly 1–5 points on an IQ-type scale. That is an average estimate, not a promise: the effect differs by age, setting, and the cognitive test used, and it does not imply that four years of college guarantees a 20-point increase.
The safest interpretation is that schooling and ability reinforce one another. People with more opportunity and preparation are more likely to stay in school; sustained learning can then strengthen the kinds of reasoning that tests measure.
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Does a college major have an average IQ too?
Not directly. Universities do not routinely administer a full clinical IQ test to every student in every major. Most published “IQ by major” charts convert admissions-test data into an IQ-like estimate. ETS, for example, publishes GRE Verbal, Quantitative, and Analytical Writing means for broad intended-major groups. Its current interpretive tables use testing data from July 2021 through June 2024 and group hundreds of detailed fields into broad categories.
That source can show which applicant pools tend to have higher verbal or quantitative scores. It cannot prove that studying physics causes a higher IQ, nor can it describe every undergraduate in that field. The GRE is an admissions test with its own preparation effects, content emphasis, and ceiling; it is not a substitute for an individually administered intelligence assessment.
| What is being compared | What the data can support | What it cannot support |
|---|---|---|
| Graduate applicants by intended field | Differences in average GRE section scores | A precise IQ for every major |
| Students who complete a degree | Association between attainment and test performance | A guarantee that the degree caused the entire difference |
| A single person's major | A clue about the skills their program rewards | A diagnosis of that person's intelligence |
In broad GRE summaries, quantitative-heavy fields such as mathematics, physics, engineering, and computer science often sit near the top of the quantitative distribution. Philosophy and several other humanities fields can perform strongly on verbal and analytical measures. Large majors such as business and education contain a much wider mixture of preparation. Those patterns describe applicant pools, not a hierarchy of human worth.
Why can two studies report different numbers?
Several design choices move the mean without anyone making a mistake.
- Different tests: WAIS, school achievement tests, GRE, and SAT overlap in what they measure but are not interchangeable.
- Different cohorts: Older norming samples and newer student cohorts grew up with different schooling, technology, and access.
- Different definitions: “College educated” might mean some college, a completed bachelor's degree, or a selective graduate program.
- Different fields: A doctorate in theoretical physics and a doctorate in education are both doctorates but draw from different applicant pools.
- Different countries: Admission systems, inequality, language, and the meaning of a degree vary internationally.
For that reason, a responsible article reports the sample and uncertainty instead of declaring one universal “degree IQ.” If a chart gives a single decimal with no test, year, sample, or conversion method, treat it as entertainment rather than evidence.
Does earning a degree make someone smarter?
It can improve measured performance, but the answer is not all-or-nothing. Education supplies practice with reading, quantitative reasoning, planning, and unfamiliar problems—the same kinds of tasks that appear in many cognitive tests. At the same time, students who are healthier, better prepared, or more motivated are more likely to complete the next credential. Observed differences therefore combine learning, selection, and life circumstances.
The effect is also domain-specific. A literature course may strengthen vocabulary and argumentation; an engineering course may provide intensive quantitative practice. Neither course turns a transcript into a complete map of memory, processing speed, creativity, practical judgment, or social intelligence. A standardized IQ score is one measurement taken under one set of conditions, not a final evaluation of a person's potential.
How should you use these numbers for yourself?
Use education statistics to understand populations, not to label yourself or other people. If you are choosing a major, consider interest, support, cost, career fit, and the kind of work you want to practice. If you want to know your own cognitive profile, take a properly designed, age-appropriate assessment and interpret it with a qualified professional when a high-stakes decision is involved.
Q: What degree has the highest average IQ?
A: There is no definitive degree ranking from real IQ tests. Quantitative-heavy graduate fields often have higher average GRE Quantitative scores, while some humanities fields are strong on verbal and analytical sections. Those are applicant-pool patterns, not precise IQ means.
Q: Is the average IQ of a bachelor's degree holder about 115?
A: Around 110–115 is a cautious estimate in several summaries, not a cutoff. Samples, countries, tests, and definitions of “bachelor's degree” differ. Individuals with the same credential span a broad range of scores.
Q: Does a PhD prove someone has a high IQ?
A: No. Doctoral completion reflects ability alongside persistence, research training, mentorship, funding, health, and opportunity. Doctorate-level group means are estimates and vary substantially by field.
Q: Can more education raise IQ?
A: Research suggests that additional schooling can raise measured cognitive scores on average. A meta-analysis of more than 600,000 participants estimated roughly 1–5 IQ points per additional year in its designs, but the effect is not guaranteed for every person and should not be used as a promise of a specific score.
Q: Should I choose a major because its average IQ looks high?
A: No. Major-level averages mostly reflect selection and the skills an admissions test rewards. Interest, preparation, wellbeing, and sustained effort are better guides to finding a field in which you can do excellent work.
References
- Ritchie, S. J., & Tucker-Drob, E. M. (2018). How Much Does Education Improve Intelligence? A Meta-Analysis. Psychological Science, 29(8).
- Educational Testing Service. GRE score interpretation and data by graduate major field.
- Educational Testing Service. GRE General Test Interpretive Data by Graduate Major Field, 2021–2024.
- American Psychological Association. Intelligence.
Last updated: July 19, 2026
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