Myths and famous claims
What was Nikola Tesla's IQ?
What is documented
There is no record that Nikola Tesla ever took an IQ test, and no reputable estimate of his IQ exists. He was born in 1856, outside the range of the best-known historical study, so Catharine Cox never estimated him. The numbers online have no test or published method behind them.
Want your own number? The test is 25 visual puzzles, about 12 minutes, no sign-up.
Why there is no number
An honest IQ figure for a historical person can come from only two places: a test the person actually took, or a published estimate with a stated method. Tesla has neither. No record of a test has surfaced, and he falls outside the one major study that estimated IQs from biographies. Nikola Tesla was born in 1856 and died in 1943 (Britannica, Nikola Tesla). Catharine Cox's 1926 study only included people born between 1450 and 1850 (Simonton 2020), and only people who had already died, so Tesla was never in it. We also found no other scholarly estimate for him.
How testing history lines up with his life
The dates explain why a real score would be surprising.
| Year | Event | Tesla's age |
|---|---|---|
| 1905 | Binet and Simon publish the first practical intelligence scale, built for children | 49 |
| 1917 | The Army Alpha, the first successful adult test, appears | 61 |
| 1939 | The Wechsler-Bellevue scale introduces the adult deviation IQ | 83 |
Sources for the dates: Binet and Simon (Britannica, Alfred Binet), the Army Alpha (Warne 2023), Wechsler-Bellevue (Wikipedia: WAIS). Tesla was 49 when the first scale for children appeared and 83 when the adult deviation IQ arrived. Nothing rules out a test, but nothing records one either.
Tesla is not unusual here. Thomas Edison (1847 to 1931) was still alive when Cox published, so he is not in her study (Britannica, Thomas Edison), and Marie Curie (1867 to 1934) was born after Cox's cutoff (NobelPrize.org, Marie Curie).
Try one · Logical Reasoning
Which tile completes the second pair?
Tap the option you think is right, or show the answer.
Show the answer
The missing panel shows a small solid circle, with small solid shapes: a triangle at the bottom-left corner (option 3).
How to solve it
- Compare the first two panels and name exactly what changed.
- The main shape and the small shapes swap forms: the main shape takes the form of the small ones, and the small ones take the form of the main shape.
- Nothing else changes.
- Apply the same change to the third panel: a small solid triangle pointing up, with small solid shapes: a circle at the bottom-left corner.
- So the missing panel shows a small solid circle, with small solid shapes: a triangle at the bottom-left corner.
That was 1 puzzle. The full test has 25.
Why the internet numbers vary
When a number has no source, nothing stops it from changing as it is copied. Einstein is the documented case: psychologist Russell Warne found published claims from 150 to 207, including two different figures printed by LIFE magazine nine years apart, and concluded that none was credible (Warne 2023). Tesla numbers behave the same way. Wide disagreement is a sign that no one is reporting a measurement.
What evidence would be needed
For a Tesla IQ claim to be worth repeating, it would need at least one of these:
- A named test, with the date and his age when he took it, from a primary record such as a letter or archive file.
- The norms used to turn his raw score into an IQ, since scales differ in their standard deviation (Wikipedia: IQ classification).
- Or, for an estimate, a published study that names its raters, its biographical sources and its method, as Cox did.
Even a careful estimate would not be a test score. Dean Keith Simonton points out that historiometric estimates and test scores are different things (Simonton 2020). The page on historical IQ estimates explains why.
How to judge a famous IQ claim
- Is a specific test named? For Tesla, none is.
- Does the timeline make a test plausible at the age claimed?
- Is there a primary source, or only other lists of famous IQs?
- Do independent sources agree?
See how the same checks work for Einstein and for claims of the highest IQ ever recorded. For the history behind the dates, read the history of IQ tests.
Sources
- Encyclopaedia Britannica. Nikola Tesla (read via Wayback Machine, 2024) www.britannica.com/biography/Nikola-Tesla
- Simonton, D. K. (2020). Galton, Terman, Cox: The Distinctive Volume II in Genetic Studies of Genius. Gifted Child Quarterly. doi:10.1177/0016986220921360 doi.org/10.1177/0016986220921360
- Encyclopaedia Britannica. Alfred Binet (read via Wayback Machine, January 2025) www.britannica.com/biography/Alfred-Binet
- Warne, R. T. (2023, September 14). The search for Albert Einstein's IQ. russellwarne.com (blog of a research psychologist) russellwarne.com/2023/09/14/the-search-for-albert-einsteins-iq/
- Wechsler Adult Intelligence Scale. Wikipedia. en.wikipedia.org/wiki/Wechsler_Adult_Intelligence_Scale
- Encyclopaedia Britannica. Thomas Edison (read via Wayback Machine, 2024) www.britannica.com/biography/Thomas-Edison
- Marie Curie, Facts. NobelPrize.org www.nobelprize.org/prizes/physics/1903/marie-curie/facts/
- IQ classification. Wikipedia. en.wikipedia.org/wiki/IQ_classification