What was John von Neumann’s IQ?
Pólya called him “the only student I was ever afraid of.” No test exists, and the 300 has no source.
John von Neumann’s IQ was never measured: he died in 1957, and no IQ test result for him has been published as of November 2026. The 300 that circulates online has no named test, examiner or date behind it, and it is not Catharine Cox’s 1926 figure, because her study does not include him. The documented record is a chemical-engineering diploma and a mathematics doctorate, both in 1926, and a place among the first six professors of the Institute for Advanced Study’s School of Mathematics in 1933.
John von Neumann’s estimated IQ
- Early guidance from his teacher László Rátz and the mathematicians Michael Fekete, Lipót Fejér and Gábor Szegő. His first mathematics paper, written with Fekete, was published in 1922, when he was eighteen.
- A chemical-engineering diploma from ETH Zurich and a mathematics doctorate from the University of Budapest, both in 1926, when he was twenty-two.
- One of the original six professors of the School of Mathematics at the Institute for Advanced Study in 1933, alongside Albert Einstein.
- Foundational work in several fields: the minimax theorem of game theory (1928), the mathematical foundations of quantum mechanics (1932), Theory of Games and Economic Behavior with Oskar Morgenstern (1944) and the First Draft of a Report on the EDVAC (1945).
No IQ test result for von Neumann has been published; the range is inferred from an unusually dense record of documented achievement, not from a score. Above about 160, tests cannot separate people reliably, so the top of the range is partly extrapolation.
- Born
- December 28, 1903, Budapest
- Died
- February 8, 1957 (age 53), Washington, D.C.
- Diploma
- Chemical engineering, ETH Zurich, 1926
- Doctorate
- Ph.D. mathematics, University of Budapest, 1926, summa cum laude
- Institute for Advanced Study
- 1933, one of the original six professors of the School of Mathematics
- Field
- Mathematics, physics, computer science, economics
- Best known for
- Game theory, the von Neumann computer architecture, quantum mechanics’ mathematical foundations
What an IQ of 170–190 actually means
Set the claim aside for a moment. If someone genuinely scored in this range, here is what that would represent.
Average is 100 by construction, and about two-thirds of people fall between 85 and 115. Take the test to place your own score on this scale.
| Score range | Classification | Share of people | What it indicates |
|---|---|---|---|
| 85 – 114 | Average | ~68% | The range most people fall into. |
| 115 – 129 | Above average | ~13.6% | Roughly one person in seven. |
| 130 – 144 | Gifted | ~2% | The threshold most high-IQ societies use. |
| Above 144 | Highly gifted | ~0.1% | Figures above this range are extrapolated from the curve rather than measured. |
Percentages are approximate and describe a normal distribution. The same number means different things on tests with different standard deviations.
Thirty questions gives you a measured position on this exact scale — your score, your percentile and the ability breakdown behind it.
Find out in 30 minutes →Who John von Neumann was
How smart was John von Neumann? Colleagues described a mind that was unusually fast and broad. Paul Halmos, who later served as his assistant, wrote that “the speed with which von Neumann could think was awe-inspiring,” and quoted George Pólya, whose lectures at ETH Zurich von Neumann attended: “Johnny was the only student I was ever afraid of.”
Eugene Wigner said his quantum-mechanics work alone “would have secured him a distinguished position in present day theoretical physics.” None of these judgments gives a score; they describe speed, range and output.
Born in Budapest on December 28, 1903, he was the subject of stories from childhood. Halmos wrote that “the legends about him started accumulating in his childhood,” among them that at six he could divide two eight-digit numbers in his head and by eight had mastered calculus. He called many such tales “undocumented and unverifiable.”
MacTutor, quoting William Poundstone’s biography, adds that at six he could exchange jokes with his father in classical Greek and that the family showed off his ability to memorize phone-book columns. The firmly documented part begins with his teacher László Rátz and with Michael Fekete, Lipót Fejér and Gábor Szegő. His first mathematics paper, written with Fekete, was published in 1922.
His father wanted a career in industry, and the compromise, proposed by Theodore von Kármán, was chemistry. Von Neumann studied chemistry at the University of Berlin from 1921, moved to Zurich in 1923 and received his chemical-engineering diploma from ETH Zurich in 1926.
Meanwhile he sat the mathematics examinations of the University of Budapest, where his set-theory dissertation led to a Ph.D. in 1926; Wikipedia says he passed the final examinations summa cum laude. He then studied under David Hilbert at Göttingen in 1926–1927 on a Rockefeller grant.
In 1930 he went to Princeton University as a visiting lecturer and became a professor there in 1931. In 1933 he was one of the original six professors of the School of Mathematics at the new Institute for Advanced Study, alongside Albert Einstein. His book on the mathematical foundations of quantum mechanics appeared in 1932, when he was 28.
IQ Metrics’ study of 663 prize-winning discoveries in physics, chemistry and medicine puts the median age at the work at 39 (see at what age scientists make breakthroughs). But it covers those prize fields, not mathematics, so it is only a yardstick. For living mathematicians, our ranking of the smartest mathematicians alive uses prize records, since no adult IQ score is published for them.
He proved the minimax theorem in 1928 and co-wrote Theory of Games and Economic Behavior with Oskar Morgenstern in 1944. In 1945 he wrote the First Draft of a Report on the EDVAC, distributed on June 30, the source of the name “von Neumann architecture”.
The name is disputed because the report did not credit J. Presper Eckert and John Mauchly. At Los Alamos he worked on the explosive lenses used to compress the plutonium core of the Fat Man bomb. He died on February 8, 1957, in Washington, D.C., aged 53.
By Elora Mercer, Celebrity Research WriterFigures checked by Leon Falkner, Data & Research AnalystReviewed by Aarav Vardhan, Editor-in-Chief · Last reviewed November 2026
John von Neumann: the documented record
The estimate above rests on this record. Every entry here is a matter of public fact, which is more than can be said for the number itself.
- 1922First published mathematics paper, with Michael Fekete, at eighteen.
- 1926Completes a mathematics doctorate (Budapest) and a chemical-engineering diploma (ETH Zurich) simultaneously, at twenty-two.
- 1928Proves the minimax theorem, the cornerstone of game theory.
- 1931Becomes a professor at Princeton University after a term there as visiting lecturer in 1930.
- 1932Mathematische Grundlagen der Quantenmechanik gives quantum mechanics its rigorous mathematical footing.
- 1933Becomes one of the original six professors of the School of Mathematics at the Institute for Advanced Study.
- 1944Theory of Games and Economic Behavior, with Oskar Morgenstern, sets out the theory of games for economics.
- 1945The First Draft of a Report on the EDVAC, distributed June 30: origin of the name “von Neumann architecture.”
- 1956Receives the Atomic Energy Commission’s Enrico Fermi Award.
- 1957Dies in Washington, D.C., at fifty-three.
Where the 300 figure came from
Following a claim back to its first appearance is the part almost nobody does — and it is what most people are actually asking.
Did John von Neumann ever take an IQ test? No result is on record. Paul Halmos’s 1973 memoir “The Legend of John von Neumann,” the MacTutor biography and Wikipedia mention none. He died in 1957, so any John von Neumann IQ figure is either an inference from his record or a rumor. The 170–190 range on this page is an inference of the first kind, built from dated, checkable achievements and labeled as an estimate.
Where does the IQ of 300 for John von Neumann come from? It has no traceable source. A Japanese entertainment blog post of April 25, 2023 says his IQ is said to be around 300 and cites nothing, and an online ranking archive prints 180–190 for him while calling the number meaningless.
In Catharine Cox’s 1926 study, her raters’ highest youth estimate for anyone was 200, for Goethe, and her own “corrected” figure for him reached 210. Von Neumann, born in 1903, is not in her sample of people born 1450–1850; the full table is in the IQs of 301 geniuses.
The record-based method has a short history. In 1917 Lewis Terman judged from Karl Pearson’s biography that Francis Galton had a childhood IQ “not far from 200,” and Cox adopted the approach for 301 people born 1450–1850. Her raters put Johannes Kepler, a scientist inside her sample, at 140 for childhood and 160 for youth. The estimate on this page is the same kind of inference, but it has no raters and no reliability scores behind it, so it carries more uncertainty.
What the record supports is a high estimate without an invented number. On the usual scale, with a mean of 100 and a standard deviation of 15, 170 is about 1 in 650,000 people and 190 about 1 in a billion. A percentile calculator shows any score in between.
Above about 160, tests cannot separate people reliably (see the test ceiling), so the top of the range is partly extrapolation. Gottfried Leibniz, another mathematician and polymath, is estimated at 180–195 here, and Cox’s raters put him among the few people at 180 or more. More scientists are listed under other scientists we have checked.
How we read a number →Halmos’s 1973 memoir, the MacTutor biography and Wikipedia mention no IQ test or score for von Neumann, who died in 1957.
Memoir by his former assistant: education dates, the Princeton and Institute posts, Pólya’s remark, and the warning that many childhood stories are undocumented and unverifiable.
First paper in 1922, Berlin and Zurich studies, the 1926 diploma, the original six Institute professors, the Fermi Award, and Poundstone’s account of his early memory.
Szegő’s tutoring, the summa cum laude doctorate, the explosive lenses, his languages and Bethe’s remark.
Distributed June 30, 1945; the dispute over crediting Eckert and Mauchly.
Sets the historical ceiling: highest youth estimate 200 (Goethe), highest corrected figure 210; Kepler 140 and 160. Von Neumann, born in 1903, is outside her sample.
The full table of Cox’s estimates, including Leibniz and Kepler.
663 prize-winning discoveries in physics, chemistry and medicine; median age 39.
Says his IQ is said to be around 300; cites no test, examiner or date.
Prints an estimate of 180–190 and calls the number meaningless; names no test.
The sources behind our estimate
The figures that circulate for John von Neumann, what we were able to confirm, and where the two diverge.
300 circulates as his IQ in blog posts and online lists, and 180–190 appears in some rankings. Neither figure comes with a named test, examiner or date.
No IQ test of von Neumann is documented. Halmos’s 1973 memoir, written by his former assistant, never mentions one, and neither do the MacTutor biography or Wikipedia. A Japanese blog post of April 25, 2023 says his IQ is said to be around 300 and cites nothing. An online ranking archive gives 180–190 and calls the number meaningless.
A score of 300 would sit 13.3 standard deviations above the mean of 100 (standard deviation 15) and 90 points above the highest corrected figure in Catharine Cox’s 1926 study of 301 historical geniuses, 210. No serious method has produced a number near 300 for anyone.
Want a number that does hold up? Every figure on this page is somebody’s claim. Take the 30-question test and get a percentile you can check rather than a figure you have to trust.
John von Neumann — frequently asked
What was John von Neumann’s IQ?
John von Neumann’s IQ was never measured: no IQ test result for him has been published, and he died in 1957. This site estimates 170–190 from his documented achievements, on a scale with a mean of 100 and a standard deviation of 15. The 300 that circulates has no named test, examiner or date.
Did John von Neumann have an IQ of 300?
No. No test, examiner or date supports an IQ of 300 for John von Neumann. On a scale with a mean of 100 and a standard deviation of 15, 300 is 13.3 standard deviations above average. The highest corrected figure in Catharine Cox’s 1926 study of 301 historical geniuses was 210, and he is not in her sample.
Where does the “IQ 300” claim about von Neumann come from?
It does not come from any test or study. A Japanese blog post of April 25, 2023 says his IQ is said to be around 300 and cites nothing, and an online ranking archive lists 180–190 for him while calling the number meaningless. Neither names a test, an examiner or a date.
What is John von Neumann’s estimated IQ level?
This site estimates John von Neumann’s IQ level at 170–190, inferred from his documented achievements rather than from a score. Tests cannot separate people reliably above about 160, so the top of that range is partly extrapolation. For comparison, this site estimates 180–195 for Gottfried Leibniz and 160–180 for Albert Einstein.
How smart was John von Neumann?
His documented record shows work of unusual range. He proved the minimax theorem of game theory in 1928, published the mathematical foundations of quantum mechanics in 1932, co-wrote Theory of Games and Economic Behavior with Oskar Morgenstern in 1944 and wrote the 1945 First Draft of a Report on the EDVAC. Sources: Paul Halmos (1973), MacTutor and Wikipedia.
Was John von Neumann the smartest person ever?
No test can settle that, but colleagues rated his mind extraordinary. George Pólya called him “the only student I was ever afraid of,” Paul Halmos called the speed of his thinking “awe-inspiring,” and Hans Bethe wondered whether his brain indicated “a species superior to that of man.” None of those statements gives a score.
Could John von Neumann really divide eight-digit numbers in his head at six?
It is a story, not a documented fact. Paul Halmos’s 1973 article lists it among childhood legends, with calculus mastered by eight, and says many such tales are “undocumented and unverifiable.” The documented record starts with his teacher László Rátz and the mathematicians Michael Fekete and Gábor Szegő.
What is John von Neumann best known for?
He is best known for pioneering game theory, giving quantum mechanics a rigorous mathematical framework, and writing the 1945 First Draft of a Report on the EDVAC, which described the stored-program design called the von Neumann architecture. The name is disputed because the report did not credit J. Presper Eckert and John Mauchly, the inventors of the ENIAC.
What was John von Neumann’s education?
He finished the Lutheran Gymnasium in Budapest in 1921, studied chemistry in Berlin from 1921 and at ETH Zurich from 1923, and in 1926 received both a chemical-engineering diploma from ETH Zurich and a mathematics Ph.D. from the University of Budapest. He then studied under David Hilbert at Göttingen in 1926–1927.
How many languages did John von Neumann speak?
According to Wikipedia, he knew four languages fluently, Hungarian, French, German and English, and kept a conversational level of four more: Italian, Yiddish, Latin and Ancient Greek. MacTutor, quoting William Poundstone, says that at six he could exchange jokes with his father in classical Greek.
How does my IQ compare with John von Neumann?
You can find out in about fifteen minutes. The IQ Metrics assessment is 30 questions, scored on the same 100-mean scale used throughout this page, so your result and the estimate above are at least expressed in the same units — one measured, one inferred. Once you have a number, the leaderboard shows where it would sit, and how we score and norm it explains the benchmarking.
Where does this estimate come from?
From the documented record rather than a test — the method is named above and set out in full under how we read a number. Compare it against the other scientists profiles, starting with Albert Einstein.
- Take the 30-question IQ test — get a measured score and percentile of your own
- Average IQ by country — how the scale behaves across populations
- How IQ Metrics scores its assessment — the method behind our own number
- More on how IQ testing works — reliability, error and what a score can and cannot say
- More scientists profiles — same field, same method
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Photograph by Elke Wetzig (University of Cologne, November 2, 2006), CC BY-SA 3.0. Cropped and with background removed for the portrait above. · Portrait by Ferdinand Schmutzer (1921), public domain. Background removed for the portrait above. · Photograph by Napoleon Sarony (c. 1890), public domain. Background removed for the portrait above.
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