What Is Adragon De Mello's IQ? The 400 Prodigy Claim

Where the number 400 actually comes from

The 400 figure was produced at home, not in a clinic. According to widely reported accounts, Adragon's father, Agustin Eastwood De Mello, gave his five-year-old son a test designed for twenty-year-olds and then applied the old ratio formula for IQ.

That formula is the heart of the problem. Early 20th-century IQ scoring worked like this:

1. Estimate a child's "mental age" from test performance.
2. Divide mental age by the child's actual (chronological) age.
3. Multiply by 100.

If a five-year-old appears to perform at the level of a twenty-year-old, the math gives 20 ÷ 5 × 100 = 400. The number is real arithmetic, but it is not a measure of standing against other people. It just says a young child answered items above their age band, and for very young children the ratio explodes because the denominator is tiny. This is exactly why the field abandoned ratio IQ.

Why modern IQ scales make 400 impossible

Today's tests use deviation IQ. Instead of dividing ages, they compare your score to a large sample of same-age peers, setting the average at 100 and one standard deviation at 15 points. On that scale:

• About 68% of people fall between 85 and 115.
• An IQ of 145 is already roughly 1 in 1,000.
• The Wechsler and Stanford-Binet tests effectively ceiling out around 160, because there simply are not enough people to calibrate scores beyond that.

A score of 400 would sit dozens of standard deviations above the mean, describing a person rarer than the number of humans who have ever lived. In other words, 400 is not "extremely smart, hard to verify." It is a category error. To understand these bands properly, it helps to see how the highest IQ scores ever recorded are actually estimated and why the truly reliable ones stay far below three digits.

Related

The Highest IQ Ever Recorded: Who Holds It, and Why It's Disputed

The highest IQ ever recorded is usually credited to names like Marilyn vos Savant or William Sidis, but the numbers (up to 300) are disputed and mostly unmeasurable.

There is also a grounding data point that rarely gets quoted. When Adragon was given standardized tests at a school for gifted children, he reportedly landed around the 85th percentile for his age, below the 95th percentile that was typical for students enrolled there. That is bright, but it is a long way from any four-figure headline.

The record that was real: youngest US college graduate

Strip away the 400 and there is still a remarkable fact. In June 1988, Adragon De Mello graduated from the University of California, Santa Cruz with a degree in computational mathematics at age 11, making him the youngest college graduate in US history at the time. That record stood until 1994, when Michael Kearney graduated at age 10.

This is the part of the story that deserves the attention, and it does not need inflation. Graduating from a university math program before turning twelve is extraordinary by any honest measure, whether it came from raw ability, relentless coaching, or both.

The honest, human side of the story

Adragon's own later reflection is the most important source here. In a 2000 interview with journalist Morley Safer, he suggested his early achievements "may have been more due to endless hard work than to inherent intellectual capabilities." Coming from the person at the center of it, that line reframes the whole legend: the college degree may say more about years of intense effort than about a number.

His childhood was shaped by heavy expectations. His father had set out goals such as a physics PhD by 12 and a Nobel Prize by 16, and reports describe an intense home environment. Adragon's parents separated in July 1988, shortly after the graduation, and he was placed in the custody of his mother, Cathy Gunn, who alleged that the pressure on their son had been excessive. These are the widely reported public facts, and the kind thing to note is simply that a childhood built around a target is a hard place to grow up.

What happened next is quietly telling. Adragon stepped away from the spotlight, took his mother's surname, and re-enrolled in ordinary school under a new name rather than chasing prodigy fame. In adulthood he reportedly trained as an estimator for a commercial painting company, an ordinary working life by choice. A person is not a leaderboard entry, and his path is a healthy reminder of that.

The takeaway for anyone comparing themselves to a "400 IQ genius": you are measuring yourself against a number that was never real. A verified score from a properly normed test tells you far more than any viral figure. If you want an honest snapshot of where you stand on the standard 100-average scale, our test is free to take and shows your result after a one-time payment, with no subscription and no auto-renewal.

Related

Famous People's IQ - And the Highest IQ Ever Recorded

Einstein's 160, Newton's 190, the mythical 228 - almost every famous IQ is an estimate, not a measured score. Here is what was really tested and what was guessed.

FAQ

Q: Did Adragon De Mello really have an IQ of 400?

A: No verified 400 exists. The figure came from his father applying an old ratio-IQ formula to a five-year-old who was given a test built for twenty-year-olds. On modern deviation scales, which cap near 160, a score of 400 is not possible.

Q: How old was Adragon De Mello when he graduated college?

A: He was 11. He earned a degree in computational mathematics from UC Santa Cruz in 1988, becoming the youngest college graduate in US history at the time. Michael Kearney broke that record in 1994.

Q: Why is a childhood ratio IQ misleading?

A: It inflates for young children. Ratio IQ divides mental age by actual age and multiplies by 100, so a very young child who tests above their age band produces a huge number that does not reflect standing against peers. Deviation IQ fixed this by comparing you to same-age people.

Q: What is Adragon De Mello doing now?

A: He chose a private, ordinary life. He took his mother's surname to avoid recognition, returned to regular schooling, and later reportedly worked as an estimator for a commercial painting company. He has largely stayed out of public view.

References

• Adragon De Mello — Wikipedia
• Stanford-Binet Intelligence Scales — overview of ratio vs. deviation IQ
• Intelligence quotient (IQ scale and scoring) — Encyclopaedia Britannica

Last updated: July 13, 2026