Mathematicians With the Highest IQ: What Is Actually Known
You have probably seen the lists: a handful of famous mathematicians, each with a confident three-digit number next to their name. The honest answer to mathematicians with the highest IQ is less tidy. As of 2026, no mathematician has a verified, standardized adult IQ score that puts them at the top of any ranking. The numbers that circulate come from childhood test conversions, biographical guesswork, and repeated rumor.
That does not make the question pointless. Mathematics is a field where unusual reasoning ability shows up early and is easy to see, so it is a natural place to look for very high scores. This page separates the few numbers with a real test behind them from the ones that are folklore, explains why a math prodigy's childhood result cannot be read as a modern IQ, and shows what the evidence says about mathematical talent in general.
Which mathematicians are said to have the highest IQ?
Short answer: three names come up again and again, and only one of them has any test result behind the number at all. Here is the scorecard.
| Mathematician | Commonly cited IQ | Is there a test behind it? | What the number is based on |
|---|---|---|---|
| Terence Tao | 220 to 230 | Partly. A childhood SAT result, not an IQ test | Extrapolation from an SAT math score of 760 at age 8 |
| John von Neumann | About 190 | No test on record | His reputation for speed and memory; the figure has no traceable source |
| Carl Friedrich Gauss | Varies by list, with no agreed figure | No | Estimated backward from his achievements |
Read the third column first. A mathematician can be astonishing and still have no IQ score at all. Gauss lived long before the first intelligence scales existed, so any number attached to him is a back-calculation from his biography. Von Neumann died in 1957, and the figure usually quoted for him is a reputation rather than a result.
Tao is the interesting case. His score is the only one built on something measured, and it is worth a closer look.
Terence Tao: a real test score, a shaky IQ number
Tao scored 760 on the SAT math section at age 8, and he was one of only three children in the history of Johns Hopkins University's Study of Exceptional Talent to score 700 or above on that section before the age of 9 (Wikipedia, Terence Tao). He later won the Fields Medal in 2006 for his contributions to partial differential equations, combinatorics, harmonic analysis and additive number theory.
The 220 to 230 figure is a different matter. According to PsyPost's overview of extreme IQ claims, researchers Julian Stanley and Gross estimated it from that single childhood SAT math score, and Tao himself has called testing at that scale "extremely noisy" and suggested that "greater than 175" is a more realistic figure. In other words, the number on the lists is a statistical guess about how rare a 760 is for an 8-year-old, not the result of a full intelligence test.
John von Neumann: legend without a score
Von Neumann is often described as the smartest mathematician of the twentieth century, and the stories about him are vivid: lightning mental arithmetic, near-perfect recall, fluency across pure mathematics, physics and early computing. But stories are not scores. There is no documented test result for him, and the figure of about 190 has no traceable source. Read it as a way of saying "extraordinary," not as a measurement.
Why a prodigy's childhood number cannot be compared to a modern IQ
A childhood result and a modern adult IQ are built on different math, so they do not line up. Older child tests used a ratio formula: mental age divided by actual age, times 100. A gifted ten-year-old who performs like a typical twenty-two-year-old lands far above 200 on paper. Modern tests use a deviation score, where 100 is the average and about 15 points equals one standard deviation, as David Wechsler introduced in 1939.
On the deviation scale, scores that high stop making sense. As PsyPost reports, a ratio score of 228, the figure famously attributed to Marilyn vos Savant from a test she took at age 10, works out to roughly 8.5 standard deviations above the mean. Her adult result on the Mega Test in the mid-1980s was 186. Guinness dropped its "Highest IQ" category in 1990 because tests at the extreme top end were judged too unreliable to name a single record holder.
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For mathematicians the consequence is simple. Tao's SAT-based estimate and the lists of "200+" geniuses cannot be compared with, say, a score of 145 on a current adult test. They are different kinds of numbers. A practical rule: whenever a ranking mixes childhood extrapolations, back-calculated historical estimates and rumored adult scores in one column, the column is not telling you who is smarter.
How the historical estimates were made
Many of the numbers for long-dead scholars trace back to Catharine Cox's 1926 study of about three hundred eminent people, the second volume of Lewis Terman's Genetic Studies of Genius. Cox could not test anyone, so she used biographical records to estimate what each person had achieved as a child. Such estimates are rough at best, and they depend on how much of a person's early life happened to be documented: someone with well-kept letters and diaries can end up with a different figure than an equally gifted person with no paper trail.
Does a high IQ make a great mathematician?
It helps, but the evidence points to more than one ingredient. Researchers who follow mathematically gifted young people, such as the long-running Study of Mathematically Precocious Youth begun by Julian Stanley at Johns Hopkins in 1971, report that youth whose math ability was notably stronger than their verbal ability often went on to study and work in science and engineering. That is a finding about talent identified by tests like the SAT, not a claim that one IQ number ranks the world's mathematicians.
What the research does not give us is a clean ranking of working mathematicians by IQ. Fields Medal winners are chosen for their results, not their test scores. Long-term persistence, taste in problems, training, and collaboration all matter, and none of them show up in an IQ report. That is why a single number is a poor summary of someone like Tao or Gauss.
What this means if you are curious about your own score
You do not need a famous name to find out where you stand on a modern scale. A standardized test gives you a deviation score you can actually interpret, with a percentile attached. The famous mathematicians above are a reminder that the most impressive achievements rarely come with a score at all. An online test cannot replace a professional assessment by a licensed psychologist, but it can give you a rough, honest reference point.
Frequently asked questions
Q: Which mathematician has the highest IQ?
A: No mathematician has a verified highest IQ. Terence Tao is often given 220 to 230, but that is an extrapolation from a childhood SAT math score, and Tao has suggested "greater than 175" is more realistic. Others, such as von Neumann and Gauss, have no test on record.
Q: Did Terence Tao ever take an IQ test?
A: Not one that produced a published adult IQ score. What is documented is his SAT math score of 760 at age 8. The famous IQ range was calculated from that result, which makes it an estimate rather than a test result.
Q: What was John von Neumann's IQ?
A: There is no recorded score. The figure of about 190 has no traceable source and seems to reflect his reputation for speed and memory. Treat it as shorthand for exceptional ability, not as a measurement.
Q: Why can't childhood IQ scores be compared with adult scores?
A: Because older child tests used a ratio formula and modern tests use a deviation score. Ratio scores inflate results for gifted children, while a deviation IQ compares you to a population with a mean of 100 and a standard deviation of usually 15.
Q: Is there an official ranking of mathematicians by IQ?
A: No. Guinness retired its Highest IQ category in 1990, and no scientific body ranks mathematicians by IQ. Any such list is a popular compilation of estimates and rumors.
References
- Wikipedia contributors. Terence Tao - SAT math score at age 8 and the 2006 Fields Medal.
- Wikipedia contributors. Catharine Cox Miles - the 1926 study of about 300 eminent people, with IQ figures estimated from biographical records.
- PsyPost. What is the highest IQ ever recorded? The truth behind the numbers - ratio versus deviation IQ, Tao's extrapolated estimate, and the retirement of Guinness's category.
Last updated: November 6, 2026
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