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Kaku is one of the most recognisable working physicists alive, mostly from decades of television and radio rather than from a published test score. The record underneath the media career is real; the number attached to it on “smartest people alive” lists is not.
This is an academic and achievement-based estimate, not a test result — Kaku has never published or referenced a personal IQ score. A physics doctorate and a genuinely unusual teenage science project support a high estimate; they do not support the far higher figures that circulate on unsourced “genius” rankings.
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 →Michio Kaku was born in 1947 in San Jose, California, to Japanese-American parents who met at a wartime internment camp. He has described building the betatron accelerator as a teenager in his mother’s garage, a project that drew the attention of physicist Edward Teller, who helped arrange a scholarship to Harvard.
After Harvard and a Berkeley doctorate, Kaku became a professor of theoretical physics at the City College of New York, co-founding string field theory as a formal framework within string theory. Since the 1990s he has become one of the most visible popularisers of physics in English-language media, through books including Hyperspace and Physics of the Future, a long-running radio programme, and frequent television appearances.
By Elora Mercer, Celebrity Research WriterFigures checked by Leon Falkner, Data & Research AnalystThe 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.
Following a claim back to its first appearance is the part almost nobody does — and it is what most people are actually asking.
Kaku’s case is a plainer version of the pattern than most: a real, checkable academic record — Harvard summa cum laude, a Berkeley doctorate, a named theoretical contribution — sits underneath a much larger media profile built on decades of books, radio and television appearances explaining physics to a general audience.
The gap is not that the underlying record is weak, the way it is for several other entries on this site. It is that fame as a science communicator gets read, on listicle sites, as evidence of a specific and much higher number than the credentials alone support. The betatron project is the strongest single piece of evidence here, precisely because it predates any media career by decades.
How we read a number →Institutional academic record.
First-person account of the garage betatron project; widely repeated in profiles but originating with Kaku himself.
No test score for Kaku appears in the available interview or biographical record.
Source URLs and first-appearance date pending audit.
Typical source of the 195 figure; none reviewed cite a test or a methodology.
The figures that circulate for Michio Kaku, what we were able to confirm, and where the two diverge.
Figures around 195 appear on “smartest people in the world” and “highest IQ scientists” listicles that include Kaku primarily because of his media prominence, generally citing no test and no source.
Kaku’s own public appearances discuss his physics work and his science-fiction-adjacent speculation about future technology; in the available interview record he does not cite a personal IQ score. The 195 figure appears to derive from his visibility as a science communicator rather than from anything measured.
The lower two numbers track what his Harvard and Berkeley record can defensibly support. 195 is the number that shows up once “a famous physicist” becomes shorthand for “one of the smartest people alive,” with nothing added in between.
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.
No test result has ever been published. A figure around 195 circulates on “smartest people alive” lists, but the strongest documented evidence — a Harvard physics degree and a Berkeley doctorate — supports a lower, still high, achievement-based estimate.
By his own frequently repeated account, yes — a 2.3-million-electron-volt betatron built in his mother’s garage, which led to his entry in the 1964 Science Talent Search.
Co-developing string field theory, an extension of string theory, alongside a long career as a physics professor at the City College of New York.
There is no record of one in his available interviews or biographies.
His decades of visibility as a science broadcaster appear to function, on listicle sites, as informal evidence of exceptional intelligence, independent of any test score.
His documented academic record — a summa cum laude Harvard degree and a Berkeley PhD — is stronger than several higher-profile figures here, including Nikola Tesla, who has no equivalent institutional record at all.
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.
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.
Portrait © Matthew Yohe, CC BY-SA 3.0. The background-removed portrait above is a derivative work and is likewise offered under the same licence. · Portrait © Debbie Rowe / The Royal Society, CC BY-SA 3.0. The background-removed portrait above is a derivative work and is likewise offered under the same licence. · Portrait by Christopher Smith, U.S. Department of Health and Human Services — a work of the U.S. federal government, public domain. Background removed for the portrait above.
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