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All The US Presidents, Ranked By IQ

Updated December 13, 2018 233.2k views44 items

An intelligence quotient test (IQ test) is a series of standardized tests used to gauge and assess a person's intelligence. While most people will never take a formal IQ test, high IQs have nevertheless always been a topic of public interest.

In recent history, US president IQs have been the subject of debate and discussion. This is in part due to Donald Trump's perpetual tweeting about his high IQ during the controversial election cycle of 2016. This led people to wonder who the smartest and dumbest presidents were throughout history. 

A president's IQ is rarely made public, and many United States presidents were born before the modern IQ test was invented. Nevertheless, many psychological studies have provided educated guesses of presidential IQ based on a variety of factors. When it comes to IQ scores, a score over 140 is considered genius level.

Research indicates most presidents fall somewhere around 130, but that doesn't mean America has never had a genius in the Oval Office. There are outliers on either side, with many presidents' IQs being higher or lower than average. If you're curious to learn where our presidents rank in terms of intellectual prowess, browse the list below.

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  • John Quincy Adams1

    John Quincy Adams

    Dec. at 81 (1767-1848)

    BirthplaceBraintree, Massachusetts Bay, British America

    Presidency6

    V.P.John C. Calhoun

    ProfessionPolitician, Diplomat, Attorney at law, Lawyer

    Alleged IQ: 175

    John Quincy Adams ( (listen); July 11, 1767 – February 23, 1848) was an American statesman,...  more
  • Thomas Jefferson2

    Thomas Jefferson

    Dec. at 83 (1743-1826)

    BirthplaceShadwell, Colony of Virginia, British America

    Presidency3

    V.P.Aaron Burr, George Clinton

    ProfessionStatesman, Inventor, Author, Farmer, Architect

    Alleged IQ: 160

    Thomas Jefferson was an American Founding Father, the principal author of the Declaration of...  more
  • John F. Kennedy3

    John F. Kennedy

    Dec. at 46 (1917-1963)

    BirthplaceBrookline, Massachusetts, USA

    Presidency35

    V.P.Lyndon B. Johnson

    ProfessionPolitician, Soldier, Screenwriter, Military Officer, Author

    Alleged IQ: 160

    John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by initials JFK...  more
  • Bill Clinton4

    BirthplaceHope, Arkansas, United States of America

    Presidency42

    V.P.Al Gore

    ProfessionStatesman, Politician, Author, Lawyer, Teacher

    Alleged IQ: 159

    William Jefferson Clinton (born William Jefferson Blythe III; August 19, 1946) is an American...  more
  • Jimmy Carter5

    BirthplacePlains, Georgia, United States of America

    Presidency39

    V.P.Walter Mondale

    ProfessionStatesman, Politician, Novelist, Military Officer, Author

    Alleged IQ: 156.8

    James Earl Carter Jr. (born October 1, 1924) is an American politician and philanthropist who...  more
  • James Madison6

    James Madison

    Dec. at 85 (1751-1836)

    BirthplacePort Conway, Colony of Virginia, British America

    Presidency4

    V.P.Elbridge Gerry, George Clinton

    ProfessionPolitician, Author, Lawyer

    Alleged IQ: 155

    James Madison Jr. (March 16, 1751 – June 28, 1836) was an American statesman, lawyer,...  more
  • John Adams7

    John Adams

    Dec. at 91 (1735-1826)

    BirthplaceBraintree, Massachusetts Bay, British America

    Presidency2

    V.P.Thomas Jefferson

    ProfessionPolitician, Lawyer

    Alleged IQ: 155

    John Adams Jr. (October 30, 1735 – July 4, 1826) was an American statesman, attorney,...  more
  • Barack Obama8

    BirthplaceArea code 808, Honolulu County, Hawaiian Islands, United States of America, United States

    Presidency44

    V.P.Joe Biden

    ProfessionPolitician, Author, Writer, Lawyer

    Alleged IQ: 155

    Barack Hussein Obama born August 4, 1961is an American attorney and politician who served as...  more
  • Franklin D. Roosevelt9

    Franklin D. Roosevelt

    Dec. at 63 (1882-1945)

    BirthplaceNew York City, Hyde Park, New York, USA

    Presidency32

    V.P.John Nance Garner, Henry A. Wallace, Harry S. Truman

    ProfessionPolitician, Soldier, Corporate lawyer, Writer, Lawyer

    Alleged IQ: 150

    Franklin Delano Roosevelt (, ; January 30, 1882 – April 12, 1945), often referred to by...  more
  • Millard Fillmore10

    Millard Fillmore

    Dec. at 74 (1800-1874)

    BirthplaceMoravia, New York, United States of America

    Presidency13

    ProfessionPolitician, Lawyer

    Alleged IQ: 149

    Millard Fillmore (January 7, 1800 – March 8, 1874) was the 13th president of the United States...  more
  • Franklin Pierce11

    Franklin Pierce

    Dec. at 65 (1804-1869)

    BirthplaceHillsborough, New Hampshire, United States of America

    Presidency14

    V.P.William R. King

    ProfessionPolitician, Lawyer

    Alleged IQ: 147

    Franklin Pierce (November 23, 1804 – October 8, 1869) was the 14th president of the United...  more
  • Rutherford B. Hayes12

    Rutherford B. Hayes

    Dec. at 71 (1822-1893)

    BirthplaceDelaware, Ohio, United States of America

    Presidency19

    V.P.William A. Wheeler

    ProfessionPolitician, Lawyer

    Alleged IQ: 146

    Rutherford Birchard Hayes (October 4, 1822 – January 17, 1893) was the 19th president of the...  more
  • Woodrow Wilson13

    Woodrow Wilson

    Dec. at 68 (1856-1924)

    BirthplaceStaunton, Virginia, United States of America

    Presidency28

    V.P.Thomas R. Marshall

    ProfessionPolitician, Professor, Historian, Political scientist, Political Science

    Alleged IQ: 145.1

  • Benjamin Harrison14

    Benjamin Harrison

    Dec. at 68 (1833-1901)

    BirthplaceNorth Bend, Ohio, United States of America

    Presidency23

    V.P.Levi P. Morton

    ProfessionPolitician, Lawyer

    Alleged IQ: 145

    Benjamin Harrison (August 20, 1833 – March 13, 1901) was an American politician and lawyer who...  more
  • Andrew Jackson15

    Andrew Jackson

    Dec. at 78 (1767-1845)

    BirthplaceWaxhaw Settlement between North Carolina and South Carolina, British America

    Presidency7

    V.P.Martin Van Buren, John C. Calhoun

    ProfessionProsecutor, Politician, Judge, Soldier, Farmer

    Alleged IQ: 145

    Andrew Jackson (March 15, 1767 – June 8, 1845) was an American soldier and statesman who...  more
  • Donald Trump16

    Alleged IQ: 145

    Donald John Trump (born June 14, 1946) is an American politician who served as the 45th...  more
  • Grover Cleveland17

    Grover Cleveland

    Dec. at 71 (1837-1908)

    BirthplaceEssex County, Contiguous United States, United States of America, United States, with Territories

    Presidency22, 24

    V.P.Adlai Stevenson I, Thomas A. Hendricks

    ProfessionPolitician, Lawyer

    Alleged IQ: 144

    Stephen Grover Cleveland (March 18, 1837 – June 24, 1908) was an American politician and...  more
  • Theodore Roosevelt18

    Theodore Roosevelt

    Dec. at 61 (1858-1919)

    BirthplaceNew York City, Manhattan, Area code 917, Contiguous United States, New York

    Presidency26

    V.P.Charles W. Fairbanks

    ProfessionStatesman, Politician, Police officer, Historian, Polymath

    Alleged IQ: 143

  • George H.W. Bush19

    BirthplaceMilton, Massachusetts, United States of America

    Presidency41

    V.P.Dan Quayle

    ProfessionBusinessperson, Politician, Entrepreneur, Military aviator

    Alleged IQ: 143

    George Herbert Walker Bush (June 12, 1924 – November 30, 2018) was an American politician and...  more
  • Chester A. Arthur20

    Chester A. Arthur

    Dec. at 57 (1829-1886)

    BirthplaceFairfield, Vermont, United States of America

    Presidency21

    ProfessionPolitician, Lawyer, Teacher

    Alleged IQ: 142

    Chester Alan Arthur (October 5, 1829 – November 18, 1886) was an American attorney and...  more
  • James A. Garfield21

    James A. Garfield

    Dec. at 50 (1831-1881)

    BirthplaceMoreland Hills, Ohio, United States of America

    Presidency20

    V.P.Chester A. Arthur

    ProfessionPolitician, Lawyer, Teacher

    Alleged IQ: 141.5

  • Abraham Lincoln22

    Abraham Lincoln

    Dec. at 56 (1809-1865)

    BirthplaceKentucky, Hodgenville, United States of America, United States, with Territories

    Presidency16

    V.P.Andrew Johnson, Hannibal Hamlin

    ProfessionStatesman, Politician, Lawyer

    Alleged IQ: 140

  • Lyndon B. Johnson23

    Lyndon B. Johnson

    Dec. at 65 (1908-1973)

    BirthplaceTexas, Contiguous United States, Edwards Plateau, United States of America, United States

    Presidency36

    V.P.Hubert Humphrey

    ProfessionPolitician, Teacher

    Alleged IQ: 140

    Lyndon Baines Johnson (; August 27, 1908 – January 22, 1973), often referred to as LBJ, was an...  more
  • George Washington24

    George Washington

    Dec. at 67 (1732-1799)

    BirthplacePopes Creek, Colony of Virginia, British America

    Presidency1

    V.P.John Adams

    ProfessionSurveyor, Politician, Soldier, Military Officer, Farmer

    Alleged IQ: 140 

    George Washington was the first President of the United States, the Commander-in-Chief of the...  more
  • Gerald Ford25

    Gerald Ford

    Dec. at 93 (1913-2006)

    BirthplaceOmaha, Nebraska, United States of America

    Presidency38

    V.P.Nelson Rockefeller

    ProfessionPolitician, American football player, Lawyer

    Alleged IQ: 140

    Gerald Rudolph Ford Jr. (born Leslie Lynch King Jr.; July 14, 1913 – December 26, 2006) was an...  more