Scientists With the Highest IQ: The Estimated Rankings
You have seen the leaderboard: Isaac Newton at 190, Albert Einstein at 160, John von Neumann somewhere north of both, with Stephen Hawking and Terence Tao rounding out the modern era. It reads like an official ranking of the greatest minds in science. Here is the honest headline up front: the scientists usually named as having the scientists with the highest IQ are almost all estimates — either historiometric guesses from Catharine Cox's 1926 study or numbers invented by journalists and quiz sites — not measured test scores. As of 2026, that has not changed.
The irony is sharp. The one famous physicist who did have a documented childhood IQ, Richard Feynman, scored around 125 — high but, in his biographer's words, "merely respectable." Stephen Hawking, asked point-blank for his number, refused to give one. So the men and women at the top of these rankings mostly never sat a test, and the one who did lands below the cutoff for many high-IQ societies. Below is where each number actually comes from, so you can read the list for what it is: a fascinating model, not a scoreboard.
The ranked list: estimated vs. measured
Here is the roster you will find on nearly every "smartest scientists" list, with the column those lists usually skip — whether the number was measured or reverse-engineered, and from what.
| Rank | Scientist | Commonly cited IQ | Basis / source | Measured or estimated? |
|---|---|---|---|---|
| 1 | Isaac Newton | ~190 | Cox 1926 historiometric estimate from biographies | Estimated |
| 2 | James Clerk Maxwell | ~190 (often quoted) | Popular listicle figure; extrapolated from precocity | Estimated |
| 3 | Galileo Galilei | ~185 | Cox 1926 estimate from early academic records | Estimated |
| 4 | John von Neumann | ~190 (frequently cited) | Anecdotal genius reputation; no test on record | Estimated |
| 5 | Terence Tao | ~220–230 (media) | Extrapolated from childhood SAT/test scores | Estimated |
| 6 | Blaise Pascal | ~195 | Cox 1926 estimate from documented early mathematics | Estimated |
| 7 | Charles Darwin | ~165 | Cox 1926 estimate; rated an ordinary schoolboy | Estimated |
| 8 | Albert Einstein | ~160 | Media/popular figure; never took a test | Estimated |
| 9 | Stephen Hawking | (refused to state) | Declined to give a number | Neither |
| 10 | Richard Feynman | ~125 | High-school IQ test (per biographer James Gleick) | Measured |
Two patterns jump out. First, the highest numbers belong to people born before the IQ test existed, because those figures come from Cox's biography-scoring method, which tends to produce very large values. Second, the only entry with a real, documented score — Feynman — sits at the bottom of the list, well beneath the estimates for men whose actual work was arguably no more revolutionary than his.
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Where each number really comes from
The Cox 1926 estimates (Newton, Galileo, Pascal, Darwin)
Most of the historical figures trace to one source: Catharine Cox's 1926 dissertation The Early Mental Traits of Three Hundred Geniuses, the second volume in Lewis Terman's Genetic Studies of Genius series. Cox's team read roughly 1,500 biographies of 301 eminent people born between 1450 and 1850 and estimated childhood IQs from how precocious each subject appeared — the age they learned to read, wrote their first work, or outpaced classmates. This is historiometry: applying quantitative scores to historical records, not to people. No one born in 1642 ever sat a test; Cox measured the impressiveness of surviving anecdotes. In a later replication of her data, mean estimated IQs by field came out around 164 for scientists and 173 for philosophers, per Simonton's analyses.
The media guesses (Einstein, von Neumann, Maxwell)
Einstein's "160" appears on quiz sites and captions everywhere, but there is no record he ever took an IQ test — he was already an adult by the time the first practical test (Binet's, for French children) appeared in 1905, per Britannica and other sources. Von Neumann's oft-quoted "190" rests on colleagues' awestruck anecdotes rather than any assessment. Maxwell's number is a listicle extrapolation. These are educated admiration, not data.
The extrapolated prodigy (Terence Tao)
Tao is routinely called "the smartest person alive" with an IQ of 220 or 230, but there is no official record of that score. Per Wikipedia and biographical accounts, what is documented is his childhood testing: at age eight he scored 760 out of 800 on the SAT mathematics section, and he earned his PhD from Princeton at 21. The 230 figure is a back-calculation from those feats, not a reported test result.
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The one measured score (Feynman)
Richard Feynman — Nobel laureate, architect of quantum electrodynamics — had his IQ assessed in high school at around 125, described by biographer James Gleick as high but "merely respectable." Feynman reportedly declined an invitation to Mensa on the grounds that his IQ was too low, and his sister Joan, who scored a point higher, liked to tease that she was the smarter sibling. The lesson is not that Feynman was ordinary; it is that a single school-administered test, with its ceiling effects and narrow format, captures very little of what made him extraordinary.
The honest takeaway
Put the list next to its sources and the ranking dissolves into three different things wearing one costume: Cox's biography scores, journalists' guesses, and one real childhood test. They are not comparable to each other, let alone to a score you would get today. Old childhood IQ used a "ratio" formula that inflates precocious young children's numbers, later scholars who re-corrected Cox's data pulled the top scores down sharply, and the measurement scale itself drifted across the 20th century (the Flynn effect). So when a page tells you Newton "had" a 190, read it the way you read a film's inflation-adjusted box office: a reasonable model built long after the fact, not a fact carved in stone.
What the estimates do capture is real and worth knowing — extraordinary early ability, documented across centuries of biography. They just cannot be lined up like race times. If you want a number that actually describes you, the only way to get one is to take a properly normed test yourself.
FAQ
Q: Which scientist has the highest IQ?
A: No one can say for certain, because almost none were tested. The scientist most often placed at the top is Isaac Newton at around 190, but that figure is an estimate from Catharine Cox's 1926 historiometric study, produced by scoring biographies, not by any test Newton took.
Q: What was Albert Einstein's IQ?
A: Around 160 by popular reckoning, but he never took an IQ test. Einstein was already an adult when the first practical intelligence test appeared in 1905, so the 160 is a media estimate attached to him long after the fact, not a measured score.
Q: Was any famous scientist's IQ actually measured?
A: Yes — Richard Feynman's, at roughly 125. According to biographer James Gleick, the Nobel-winning physicist was assessed in high school at about 125, "merely respectable," and reportedly declined to join Mensa. It is the rare documented case, and it sits below the estimates given to less-tested peers.
Q: Is Terence Tao's IQ really 230?
A: There is no official record of that number. The 230 figure is extrapolated from Tao's childhood achievements — including a 760 on the SAT math section at age eight — rather than from any reported IQ test result.
Q: Why did Stephen Hawking refuse to give his IQ?
A: He thought the question missed the point. Asked in a 2004 interview, Hawking replied, "I have no idea. People who boast about their IQ are losers," adding that ability runs on a continuous range with no clear dividing line.
References
- Cox, C. M. (1926). The Early Mental Traits of Three Hundred Geniuses. Stanford University Press. Summary via Wikipedia: Catharine Cox Miles
- Wikipedia: Terence Tao — documented childhood test scores and academic timeline
- Wikipedia: Richard Feynman — high-school IQ (~125) per James Gleick, Genius
- Newsweek: Stephen Hawking on IQ — the 2004 "losers" quote in context
Last updated: July 13, 2026
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