Few questions spark as much curiosity as “Who is the smartest person in the world?” It’s a title that shifts with new tests, historical re-evaluations, and the occasional viral claim. Right now, the most talked-about name is YoungHoon Kim, but the answer is more complicated than a single number. This article separates verified IQ records from rumor and puts modern contenders alongside history’s brightest minds.

4 related posts

Highest recorded IQ (alive): 276 (YoungHoon Kim) ·
Estimated IQ of Albert Einstein: 160–190 ·
Claimed IQ of William James Sidis: 250–300 ·
Number of people with IQ >200 documented: Fewer than 20 ·
Year of oldest known genius: 1879 (Einstein birth)

Quick snapshot

1Confirmed facts
2What’s unclear
3Timeline signal
  • 1452–1519: Leonardo da Vinci’s life – often listed as historical genius
  • 1879–1955: Albert Einstein – iconic physicist
  • 1898–1944: William James Sidis – child prodigy
  • 1946–present: Marilyn vos Savant – high IQ scores
  • 2024: YoungHoon Kim recorded with 276 IQ
4What’s next
  • IQ tests may continue to evolve with extended norms
  • Debate over “smartest” will likely shift to multi-dimensional intelligence metrics
  • New test-verified records could emerge from high-range societies
Key facts at a glance
Label Value
Highest verified IQ 276 (YoungHoon Kim, 2024)
Highest estimated IQ (historical) 250–300 (William James Sidis)
Most famous genius Albert Einstein
Number of people with IQ >200 Fewer than 20 verified
Year of earliest genius in top lists 1452 (Leonardo da Vinci)

Who is the smartest person in the world now?

Current record holder based on certified IQ tests

According to USI Association (a group that tracks high‑IQ claims), YoungHoon Kim reportedly scored 276 on a standardized test, making him the most frequently cited living person for the top spot. However, the verification chain does not come from a mainstream academic body, and the claim is treated with caution by many experts.

Criteria for being considered the smartest alive

  • A certified score from a recognized IQ test (e.g., Stanford-Binet, Wechsler).
  • Independent verification by a third party (e.g., Mensa, Giga Society).
  • Consistency across multiple test administrations.

Because no single authority governs “highest IQ” rankings, the title remains contested. ScienceABC (a science education site) notes that modern online lists mix verified scores with self-reported or promotional claims.

The catch

The top spot depends on which test and which era you trust. YoungHoon Kim’s 276 is the highest reported, but it’s based on a single source with low academic confidence.

The implication for curious readers: no single database holds a definitive answer, so cross-referencing multiple sources is essential before accepting any claim.

Who has a higher IQ than Einstein?

Historical figures with estimated IQs exceeding Einstein’s

Albert Einstein’s IQ is estimated at 160–190, but he never took an IQ test (ScienceABC (tier‑2)). William James Sidis, a child prodigy born in 1898, is estimated to have had an IQ between 250 and 300 — far above Einstein’s range. Reader’s Digest lists Sidis as one of the highest-IQ individuals ever.

Modern test-takers who surpass Einstein’s estimated score

  • YoungHoon Kim (276) — exceeds Einstein’s estimate
  • Marilyn vos Savant (228) — exceeds Einstein’s estimate
  • Terence Tao (225–230) — exceeds Einstein’s estimate

Science Focus (a popular science magazine) reports that Terence Tao is often cited with an IQ around 225–230, placing him above Einstein’s estimated range.

Why this matters: Einstein’s genius is measured by his contributions, not his test score. For modern comparison, raw IQ numbers alone don’t capture the full picture of intellectual achievement.

Who is the no. 1 IQ person?

Top IQ scores on record

Among verified scores, Marilyn vos Savant’s 228 (Stanford-Binet at age 10) is the most famous published score. CheckIQFree (a trivia site) states that the highest IQ ever recorded is 228, attributed to her. YoungHoon Kim’s 276 is more recent but less widely verified.

Verification and controversy around top scores

  • Guinness stopped certifying “Highest IQ” in 1990 (ScienceABC).
  • Many scores are self-reported or from high-IQ societies that lack external validation.
  • Standardized tests have ceilings; above 160, extended norms are needed.
The upshot

Readers should treat any claim above 200 with skepticism unless backed by a reputable testing organization. The “no. 1” title is more a matter of which source you trust than a universal fact.

Is Einstein the smartest person in the world?

Einstein’s contributions vs. IQ numbers

Einstein’s theories of relativity redefined physics. RBC Trends (a Russian business media outlet) notes that ranked “smartest person” lists often place Einstein alongside Newton and da Vinci, despite the lack of formal IQ test records.

Other historical geniuses: Newton, da Vinci

  • Isaac Newton — estimated IQ 190–200
  • Leonardo da Vinci — estimated IQ 180–220

These figures are based on biographical analysis, not test scores. Science Focus warns that IQ does not measure all forms of intelligence or achievement.

The trade-off: Einstein’s impact on science is unmatched, but his estimated IQ is lower than several modern and historical figures. Being “smartest” depends on whether you value raw cognitive speed or lasting contributions.

Who is the second smartest person in the world?

Runners-up in verified IQ rankings

Kim Ung-Yong, a Korean child prodigy, is reported to have an IQ of 210 (ScienceABC). Christopher Langan, an American horse rancher, claimed an IQ of 195–210. Both are often listed behind YoungHoon Kim in modern roundups.

Role of test type in ranking order

Different tests produce different scores. The Stanford-Binet and Wechsler scales have different ceilings and norms. Reader’s Digest includes Kim Ung-Yong in its list of highest IQs, but notes that exact comparisons are impossible without a universal test.

What this means: The “second smartest” slot changes depending on whether you include historical estimates or restrict to verified living individuals. The ranking is fluid and subjective.

Comparison: Historical vs. Modern Geniuses

The data below shows a stark contrast: the highest IQ numbers come from modern test-takers, while historical figures rely on estimates rather than verified scores.

Name Lifespan Reported IQ Verification
YoungHoon Kim Alive (2024) 276 Low (single source, tier‑3)
Marilyn vos Savant 1946–present 228 Medium (Stanford-Binet, age 10)
William James Sidis 1898–1944 250–300 Estimated (biographical)
Albert Einstein 1879–1955 160–190 Estimated (never tested)
Leonardo da Vinci 1452–1519 180–220 Estimated (historical analysis)

The pattern: Modern living candidates have the highest reported numbers, but the verification is weakest. Historical figures have lower reported numbers but are backed by centuries of documented achievement.

Timeline: Milestones of Genius

  • : Life of Leonardo da Vinci, often listed as historical genius.
  • : Life of Albert Einstein, iconic physicist.
  • : Life of William James Sidis, child prodigy.
  • : Marilyn vos Savant achieves high IQ scores.
  • : YoungHoon Kim recorded with highest verified IQ of 276.

Clarity: What We Know and What We Don’t

Confirmed facts

  • YoungHoon Kim scored 276 on a standardized IQ test (low confidence, tier‑3 source).
  • Einstein never took an IQ test.
  • William James Sidis is estimated to have IQ 250–300.

What’s unclear

  • Exact IQ of historical figures (Einstein, da Vinci).
  • Validity of self-reported IQ scores like Elon Musk’s 155.
  • Whether IQ alone determines “smartest” person.

Expert Perspectives

YoungHoon Kim is repeatedly claimed in 2024-2025 web coverage to have a verified IQ of 276, but the verification chain is not an established mainstream academic standard.

— USI Association (tier‑3 source)

Ranked ‘smartest person’ lists often place historical figures such as Albert Einstein, Stephen Hawking, and Isaac Newton in the discussion despite the lack of comparable formal IQ test records.

— RBC Trends (tier‑2 source)

Some lists state that the highest IQ score ever recorded was 228 and attribute it to Marilyn vos Savant.

— CheckIQFree (tier‑3 source)

Summary

The search for the smartest person in the world reveals a tension between impressive test scores and lasting intellectual impact. For a curious reader trying to decide whose claim to trust, the implication is clear: rely on sources with academic backing, not viral lists, and remember that a number alone never tells the full story of genius.

Additional sources

usiassociation.org, brainmanager.io, timesofindia.indiatimes.com, geniuses.club, legit.ng, lsfellowship.missouri.edu

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Frequently asked questions

What is considered a genius IQ score?

Typically, a score above 140 is considered genius-level. This is two standard deviations above the mean of 100.

How reliable are IQ tests for measuring intelligence?

IQ tests measure specific cognitive abilities but do not capture creativity, emotional intelligence, or practical knowledge. Many experts caution against using them as the sole measure of intelligence (Science Focus).

Can a person have an IQ of 400?

No. The standard deviation of IQ tests is 15, so a score of 400 would be 20 standard deviations above the mean — statistically impossible. Reported scores above 200 are already controversial.

Did Albert Einstein take an IQ test?

No. Einstein never took an IQ test. His estimated IQ of 160–190 is based on biographical analysis, not testing (ScienceABC).

What is the average IQ of a human?

The average IQ score is 100, with a standard deviation of 15. About 68% of people score between 85 and 115.

Are there people with IQ over 300?

No verified IQ test can produce a score above roughly 200 on standard scales. Claims of 300+ are either estimated (historical) or unverified.

Bottom line: The title “smartest person in the world” is not owned by any single individual. YoungHoon Kim has the highest reported score, but verification is weak. Readers seeking a definitive answer must accept that the outcome depends on what you measure and whom you trust.

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