What was Muhammad Ali’s IQ?
The rarest thing in this section: a real, documented test result.
Muhammad Ali’s IQ was never measured: what exists is a 1964 Army mental aptitude test on which he scored in the 16th percentile, against a required 30, and the 78 that circulates as his IQ is a conversion of that rank. The Army cut its threshold to the 15th percentile in 1966, and a 16th percentile is about 85 on the usual IQ scale, so this site estimates 80–100.
Muhammad Ali’s estimated IQ
- A pre-induction mental aptitude test on January 24, 1964 that put him in the 16th percentile of test-takers when the military required 30; a retest in mid-March gave the same result (Michael K. Bohn, Tribune News Service, April 30, 2017).
- Reclassification as 1-Y in 1964 and, after the Army lowered its standard to the 15th percentile, back to 1-A on February 17, 1966 (Tribune News Service; Wikipedia).
- Dyslexia, which Wikipedia says made reading and writing difficult and which it gives as the reason his writing and spelling were sub-standard on the test; Sports Illustrated (April 28, 2020) also says he failed in 1964 because of dyslexia.
- Graduation from Central High School in Louisville in 1960, according to the Kentucky Historical Society’s marker.
This is one of the few genuinely documented results in the section, and it should be read for exactly what it was: a written screening test, sat by a man who had boxed since the age of twelve and who is reported to have been dyslexic. A percentile is a rank among test-takers, not an IQ, which is why the band is wide.
- Born
- January 17, 1942, Louisville, Kentucky
- Died
- June 3, 2016, Scottsdale, Arizona
- Field
- Boxing
- Education
- Central High School, Louisville (graduated 1960); reported to be dyslexic
- Documented test result
- Pre-induction mental aptitude test, January 24, 1964 — 16th percentile (30 required)
- Circulating figures
- 78 (press tradition and The Genius Index); 83 (cited from FBI files)
- On record about IQ
- Said he had only ever claimed to be the greatest, not the smartest.
What an IQ of 80–100 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 Muhammad Ali was
Cassius Marcellus Clay Jr. was born in Louisville, Kentucky, on January 17, 1942, and began boxing at twelve. He graduated from Central High School in 1960, won a light-heavyweight gold medal at the 1960 Rome Olympics, and took the world heavyweight title from Sonny Liston in February 1964, at twenty-two.
He announced that he had joined the Nation of Islam and soon took the name Muhammad Ali. In 1967 he refused induction into the US Army on religious grounds, was stripped of his title and convicted of draft evasion; the conviction was overturned unanimously (8–0) by the Supreme Court in 1971. He did not fight for three and a half years at the peak of his career.
He regained the title from George Foreman in Kinshasa in 1974 and again from Leon Spinks in 1978, the first heavyweight to win it three times. He made public his diagnosis of Parkinson’s syndrome in 1984 and died in Arizona in June 2016.
By Elora Mercer, Celebrity Research WriterFigures checked by Leon Falkner, Data & Research AnalystReviewed by Aarav Vardhan, Editor-in-Chief · Last reviewed November 2026
Muhammad Ali: 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.
- 1942Born in Louisville, Kentucky.
- 1954Begins boxing at twelve.
- 1960Graduates from Central High School and wins Olympic light-heavyweight gold in Rome.
- 1964Scores in the 16th percentile on the Army’s mental aptitude test on January 24 and is reclassified 1-Y; beats Sonny Liston for the heavyweight title in February.
- 1966The Army lowers its standard to the 15th percentile; Ali is reclassified 1-A on February 17.
- 1967Refuses induction; is stripped of his title and convicted.
- 1971The Supreme Court overturns the conviction unanimously.
- 1974Regains the title from George Foreman in Kinshasa.
- 1978Wins the heavyweight title for a third time.
- 1984Makes public his diagnosis of Parkinson’s syndrome.
- 2016Dies in Scottsdale, Arizona.
Where the 78 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.
This page is the mirror image of the rest of the section. Everywhere else the problem is a number with no test behind it. Here there is a test, a date and a result — and the number is still badly misused.
Did Muhammad Ali really have an IQ of 78? No test result gives that number. The documented fact is a rank: on January 24, 1964 the draft’s mental aptitude test put him in the 16th percentile, and a mid-March retest gave the same result. On a scale with mean 100 and SD 15 the 16th percentile is about 85; see the IQ bell curve and the percentile calculator. Any Muhammad Ali IQ figure, whether 78 or 83, is a conversion with no published arithmetic.
Ali himself gave the best answer anyone has given on this page. According to Wikipedia he was quoted as saying, “I said I was the greatest, not the smartest!” He did not dispute the score; he disputed its authority.
Then set the score against the record. He improvised rhyming verse in front of hostile press rooms for two decades, had his 1967 draft-evasion conviction overturned unanimously by the Supreme Court in 1971 (the Court ruled on procedure, not on the merits of his claim), and was known for the rope-a-dope technique, leaning on the ropes to absorb punishment until an opponent tired. None of that is measured by a screening test, which is the point of this page.
How does Muhammad Ali’s estimated IQ compare with other athletes’? This site rates him at 80–100, near Mike Tyson (90–109) and well below Michael Jordan (115–135) and Josh Allen (120–135, from a Wonderlic score). Compare Eminem, whose modest circulating figure was reasoned backwards from leaving school and whose verbal ability is by any standard exceptional: the failure mode is the same in both directions. See other athletes we have checked.
How we read a number →The pre-induction exam on January 24, 1964 put him in the 16th percentile; the military required 30; a mid-March retest gave the same result; the threshold was lowered to the 15th percentile and he was reclassified 1-A on February 17, 1966.
Reclassified 1-Y in 1964 after failing the qualifying test over sub-standard writing and spelling attributed to dyslexia; standard lowered to the 15th percentile by early 1966; “I said I was the greatest, not the smartest!”; Clay v. United States decided 8–0 on June 28, 1971 on procedural grounds.
Says he failed his test in 1964 due to dyslexia and that the Army lowered its classification for draftees in 1966.
States that Muhammad Ali, then Cassius Clay, graduated from Central High School in 1960.
Riot IQ quotes historian Anthony O. Edmonds on FBI files recording 83 and describes 78 as the press tradition; The Genius Index lists an “Estimated Cognitive Quotient” of 78. Neither shows how a percentile was converted.
The unanimous Supreme Court decision overturning his conviction, as described by Wikipedia. Cited as record, not as a measure.
Ranges used for comparison: Mike Tyson 90–109, Michael Jordan 115–135, Josh Allen 120–135.
The 1964 test was a military screening instrument, not a clinical IQ test. No Wechsler, Stanford-Binet or comparable result has been published.
The sources behind our estimate
The figures that circulate for Muhammad Ali, what we were able to confirm, and where the two diverge.
That Muhammad Ali had an IQ of 78 — cited constantly, and almost always to make a point about the gap between the score and the man. The Genius Index, an IQ-archive site, lists an “Estimated Cognitive Quotient” of 78; some accounts give 83.
The underlying fact is solid: a pre-induction mental aptitude test on January 24, 1964 put him in the 16th percentile of test-takers, against a military requirement of 30, and a mid-March retest gave the same result (Tribune News Service, 2017). That is a rank, not an IQ: on a scale with mean 100 and SD 15, the 16th percentile corresponds to about 85. The 78 of press tradition and the 83 that historian Anthony O. Edmonds is quoted as finding in FBI files (as cited by Riot IQ) are conversions of that result, and no source shows how either was reached.
For once the spread reflects a genuine dispute about converting a percentile, not competing inventions. That is a much healthier kind of disagreement.
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.
Muhammad Ali — frequently asked
What was Muhammad Ali’s IQ?
Muhammad Ali has no published IQ test result. The documented score is a 16th-percentile rank on a 1964 Army mental aptitude test, about 85 on the usual IQ scale. Press tradition converts it to 78, and some accounts cite 83; this site estimates 80–100.
Did Muhammad Ali really have an IQ of 78?
The result behind that number is real, but it was a rank on a military screening test, not an IQ. On January 24, 1964 he scored in the 16th percentile, and a retest in March gave the same result. The 78 is one of several conversions of that percentile; see where celebrity IQ numbers come from.
Was Muhammad Ali’s IQ between 70 and 95?
No test result gives a range like that. The documented fact is a 16th-percentile score on a 1964 Army aptitude test, about 85 on the usual IQ scale. This site’s estimate is 80–100, a wide band because the test was a screening instrument, not a clinical IQ test.
Why did Muhammad Ali fail the Army test?
Wikipedia says his writing and spelling skills were sub-standard, which it attributes to dyslexia, and Sports Illustrated (April 28, 2020) also says he failed in 1964 because of dyslexia. The Selective Service retested him in mid-March 1964, and he scored the same.
What did Ali say about his test score?
That he had never claimed to be the smartest, only the greatest. Wikipedia quotes him as saying, “I said I was the greatest, not the smartest!” He did not dispute the score so much as its authority.
Does the score mean he was not intelligent?
It means he did poorly on a written screening test. He improvised verse under pressure for two decades, had his conviction overturned unanimously by the Supreme Court in 1971 and was known for the rope-a-dope technique. None of that appears on a screening test.
How does Muhammad Ali’s estimated IQ compare with other athletes’?
This site rates Ali at 80–100, Mike Tyson at 90–109, Michael Jordan at 115–135 and Josh Allen at 120–135. The ranges rest on different evidence, and none is a measured IQ.
How does my IQ compare with Muhammad Ali?
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 athletes profiles, starting with Magnus Carlsen.
- 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 athletes profiles — same field, same method
More athletes
Photograph by Harry Pot for Anefo, Dutch National Archives, via Wikimedia Commons (26 April 1962), CC BY-SA 3.0 NL. Cropped to exclude another member of the delegation visible in the original frame. Background removed for the portrait above. · Photograph by Anand Anil (November 2017), CC BY-SA 4.0. Background removed for the portrait above. · Photograph by All-Pro Reels (Lambeau Field, Green Bay, Wisconsin, October 24, 2021), CC BY-SA 2.0. Background removed for the portrait above.
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