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All The US Presidents, Ranked By IQ

Updated December 13, 2018 244.1k 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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  • 1

    John Quincy Adams

    Dec. at 81 (1767-1848)

    BirthplaceBraintree, Massachusetts, United States of 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, diplomat, lawyer, and diarist who served as the sixth president of the United States from 1825 to 1829. He...  more
  • 2

    Thomas Jefferson

    Dec. at 83 (1743-1826)

    BirthplaceShadwell, Virginia, United States of 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 Independence, and the third President of the United States. He was a spokesman for democracy, and embraced...  more
  • 3

    John F. Kennedy

    Dec. at 46 (1917-1963)

    BirthplaceUSA, Massachussetts, Brookline

    Presidency35

    V.P.Lyndon B. Johnson

    ProfessionPolitician, Military Officer, Author, Writer

    Alleged IQ: 160

    John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by initials JFK and Jack, was an American politician who served as the 35th president of the United States from January...  more
  • 4

    BirthplaceHope, Arkansas, USA

    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 politician who served as the 42nd president of the United States from 1993 to 2001. Prior to the...  more
  • 5

    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 served as the 39th president of the United States from 1977 to 1981. A member of the Democratic Party, he...  more
  • 6

    James Madison

    Dec. at 85 (1751-1836)

    BirthplacePort Conway, Virginia, United States of 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, diplomat, philosopher, and Founding Father who served as the fourth president of the United States from 1809 to...  more
  • 7

    John Adams

    Dec. at 91 (1735-1826)

    BirthplaceBraintree, Massachusetts, United States of 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, diplomat, writer, and Founding Father who served as the second president of the United States from 1797 to 1801....  more
  • 8

    BirthplaceHonolulu, Hawaii, USA

    Presidency44

    V.P.Joe Biden

    ProfessionPolitician, Author, Law professor, Writer, Lawyer

    Alleged IQ: 155

    Barack Hussein Obama born August 4, 1961is an American attorney and politician who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the...  more
  • 9

    Franklin D. Roosevelt

    Dec. at 63 (1882-1945)

    BirthplaceHyde Park, New York, United States of America

    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 initials FDR, was an American statesman and political leader who served as the 32nd president of the United...  more
  • 10

    Millard Fillmore

    Dec. at 74 (1800-1874)

    BirthplaceSummerhill, New York, USA

    Presidency13

    ProfessionPolitician, Lawyer

    Alleged IQ: 149

    Millard Fillmore (January 7, 1800 – March 8, 1874) was the 13th president of the United States (1850–1853), the last to be a member of the Whig Party while in the White House. A former U.S....  more
  • 11

    Franklin Pierce

    Dec. at 65 (1804-1869)

    BirthplaceHillsborough, New Hampshire, USA

    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 States (1853–1857), a northern Democrat who saw the abolitionist movement as a fundamental threat to the...  more
  • 12

    Rutherford B. Hayes

    Dec. at 71 (1822-1893)

    BirthplaceDelaware, Ohio, USA

    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 United States from 1877 to 1881, having served also as an American representative and governor of Ohio....  more
  • 13

    Woodrow Wilson

    Dec. at 68 (1856-1924)

    BirthplaceVirginia, United States of America

    Presidency28

    V.P.Thomas R. Marshall

    ProfessionPolitician, Historian, Professor, Political scientist, Political Science

    Alleged IQ: 145.1

  • 14

    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 served as the 23rd president of the United States from 1889 to 1893. He was a grandson of the ninth...  more
  • 15

    Andrew Jackson

    Dec. at 78 (1767-1845)

    BirthplaceWaxhaws

    Presidency7

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

    ProfessionProsecutor, Judge, Politician, Soldier, Farmer

    Alleged IQ: 145

    Andrew Jackson (March 15, 1767 – June 8, 1845) was an American soldier and statesman who served as the seventh president of the United States from 1829 to 1837. Before being elected to the...  more
  • 16

    Alleged IQ: 145

    Donald John Trump (born June 14, 1946) is an American politician who served as the 45th president of the United States from 2017 to 2021. Before entering politics, he was a businessman and television...  more
  • 17

    Grover Cleveland

    Dec. at 71 (1837-1908)

    BirthplaceCaldwell, New Jersey, United States of America

    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 lawyer who was the 22nd and 24th president of the United States, the only president in American history to...  more
  • 18

    Theodore Roosevelt

    Dec. at 61 (1858-1919)

    BirthplaceManhattan, New York City, New York, USA

    Presidency26

    V.P.Charles W. Fairbanks

    ProfessionStatesman, Politician, Police officer, Historian, Conservationist

    Alleged IQ: 143

  • 19

    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 businessman who served as the 41st president of the United States from 1989 to 1993 and the 43rd vice...  more
  • 20

    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 politician who served as the 21st president of the United States from 1881 to 1885. He previously was the 20th...  more
  • 21

    James A. Garfield

    Dec. at 50 (1831-1881)

    BirthplaceMoreland Hills, Ohio, USA

    Presidency20

    V.P.Chester A. Arthur

    ProfessionLaity, Politician, Lawyer, Teacher

    Alleged IQ: 141.5

  • 22

    Abraham Lincoln

    Dec. at 56 (1809-1865)

    BirthplaceHodgenville, Kentucky, United States of America

    Presidency16

    V.P.Andrew Johnson, Hannibal Hamlin

    ProfessionStatesman, Politician, Lawyer

    Alleged IQ: 140

  • 23

    Lyndon B. Johnson

    Dec. at 65 (1908-1973)

    BirthplaceStonewall, Texas, United States of America

    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 American politician who served as the 36th president of the United States from 1963 to 1969. Formerly...  more
  • 24

    George Washington

    Dec. at 67 (1732-1799)

    BirthplaceVirginia, United States of 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 Continental Army, and one of the Founding Fathers of the United States. He presided over the convention...  more
  • 25

    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 American politician who served as the 38th president of the United States from August 1974 to January...  more