IQ Scores of US Presidents: Who Was the Smartest?
Important note: Presidential IQ scores are estimates — not verified test results. No sitting or former US president has publicly released a certified IQ score. These estimates come from political scientists, historians, and psychologists who analyze presidents' writing, academic records, decision-making patterns, and cognitive achievements to infer approximate IQ ranges. The most rigorous academic work in this area was conducted by psychologist Dean Keith Simonton of UC Davis, whose research on presidential intelligence and leadership has been published in peer-reviewed journals. Other estimates come from historians and political scientists applying their own analytical frameworks.
All estimates below carry meaningful uncertainty — they should be read as informed scholarly guesses, not measurements. To learn more about what IQ actually measures, see our IQ explained guide.
Estimated IQ of US Presidents
| President | Term(s) | Estimated IQ | Notes |
|---|---|---|---|
| John Adams | 1797–1801 | ~173 | Harvard graduate, prolific writer, legal scholar |
| Thomas Jefferson | 1801–1809 | ~160 | Polymath, architect, author of Declaration of Independence |
| Woodrow Wilson | 1913–1921 | ~155 | PhD, Princeton president, 14 Points architect |
| Jimmy Carter | 1977–1981 | ~156 | Naval nuclear engineer, widely considered among the most intelligent presidents |
| John F. Kennedy | 1961–1963 | ~159 | Harvard graduate, Pulitzer Prize-winning author |
| Bill Clinton | 1993–2001 | ~159 | Rhodes Scholar, Yale Law, Oxford University |
| Theodore Roosevelt | 1901–1909 | ~149 | Harvard graduate, prolific author of 35+ books, Nobel Peace Prize |
| Barack Obama | 2009–2017 | ~145 | Harvard Law magna cum laude, Harvard Law Review president |
| Abraham Lincoln | 1861–1865 | ~128 | Self-educated lawyer, exceptional rhetorical ability |
| Franklin D. Roosevelt | 1933–1945 | ~139 | Harvard, Columbia Law, managed WWII and Great Depression |
| Richard Nixon | 1969–1974 | ~143 | Duke Law School, exceptional memory, strategic mind |
| Donald Trump | 2017–2021, 2025– | ~120–156 | Wharton (UPenn) undergraduate economics; estimates vary widely |
| George W. Bush | 2001–2009 | ~125 | Yale BA, Harvard MBA; higher than most expect |
| Joe Biden | 2021–2025 | ~133 | University of Delaware, Syracuse Law; later cognitive concerns noted |
| George Washington | 1789–1797 | ~132 | Self-educated, exceptional strategic and leadership ability |
The Most Surprising Estimates
George W. Bush (~125): Bush is often assumed to have been below average intellectually, partly due to gaffes and a folksy communication style. But he earned a bachelor's degree from Yale and an MBA from Harvard Business School — both highly selective programs. Psychologist Dean Simonton's research estimates his IQ at approximately 125, placing him in the superior range. His presidency's outcomes are a separate question from his cognitive ability.
Abraham Lincoln (~128): Lincoln had almost no formal education — less than a year total — yet taught himself law, read voraciously, and produced some of the most eloquent presidential prose in American history (the Gettysburg Address, Second Inaugural). His estimated IQ is relatively modest for this list, but his achievement given his circumstances may represent the most impressive cognitive story of any president.
Jimmy Carter (~156): Carter graduated from the US Naval Academy and was selected for the Navy's nuclear submarine program under Admiral Hyman Rickover — one of the most cognitively demanding selection processes in the US military. He is widely estimated as one of the most intellectually capable presidents. His political difficulties in office illustrate that high IQ doesn't guarantee effective leadership.
What Makes a President Smart?
Presidential effectiveness depends on multiple types of intelligence that IQ tests only partially capture:
- Political intelligence: Understanding power dynamics, coalition-building, and the art of what's achievable. FDR was a master; Carter, despite higher estimated IQ, struggled here.
- Communication intelligence: The ability to distill complex ideas into persuasive public language. Lincoln, Obama, and Reagan excelled at this regardless of IQ differences.
- Crisis intelligence: Remaining analytical under extreme pressure with incomplete information. Kennedy's handling of the Cuban Missile Crisis is the canonical example.
- Strategic intelligence: Long-term planning and anticipating consequences. Nixon's China opening required cognitive flexibility that purely high-IQ analytical thinking might not have produced.
The IQ-Success Paradox in the White House
Perhaps the most instructive finding from presidential IQ research is the weak relationship between estimated IQ and historical presidential ranking. Warren Harding — often rated the worst president in American history — has been estimated at IQ 140+. Jimmy Carter, estimated at 156, is consistently ranked in the middle tier despite his exceptional intellect. Some of the most consequential presidents (Lincoln, Washington, Truman) had more modest estimated IQs compared to their peers.
This pattern mirrors research on CEOs and leaders more broadly: above a threshold of roughly 120, incremental IQ gains matter far less than judgment, emotional intelligence, communication skill, and the ability to build trust. The presidency rewards a particular combination of cognitive, social, and emotional abilities that no single test captures.
For more on this theme, see our guide on what genius IQ really means and explore individual famous person pages for Donald Trump's IQ and Barack Obama's IQ.
Frequently Asked Questions
Which US president had the highest IQ?
John Adams is most frequently estimated as the highest at approximately 173. Thomas Jefferson (~160) and Woodrow Wilson (~155) are commonly ranked close behind. These are scholarly estimates, not verified scores.
What is Donald Trump's IQ?
Estimates range from approximately 120 to 156 depending on the analyst. His Wharton School degree and business achievements suggest above-average intelligence, while academic researcher Dean Simonton's model placed him around 156. The wide range reflects genuine analytical disagreement. See our full analysis on the Donald Trump IQ page.
What is Barack Obama's IQ?
Obama's IQ is estimated at 130–145 based on his Harvard Law magna cum laude degree and Harvard Law Review presidency. See our Barack Obama IQ page for full analysis.
Does a high IQ make a president successful?
Not reliably. The historical record shows weak correlation between presidential IQ estimates and historical effectiveness rankings. Political intelligence, communication ability, and emotional judgment appear equally or more important than raw cognitive ability.
Curious about your own score? Take our free IQ test, or explore the famous people IQ hub for scores across hundreds of public figures.
MyIQScores Editorial Team
Researchers in cognitive psychology, psychometrics & educational science
Last updated
May 10, 2026
All content on MyIQScores is reviewed for scientific accuracy against peer-reviewed research in cognitive psychology and psychometrics. Our editorial team cross-references each article with published literature before publication and updates pages whenever new research warrants a revision.