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All The US Presidents, Ranked By IQ

Updated December 13, 2018 241.0k 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)

    Alleged IQ: 175

    John Quincy Adams ( (listen); July 11, 1767 – February 23, 1848) was an American statesman,...  more
  • 2

    Thomas Jefferson

    Dec. at 83 (1743-1826)

    Alleged IQ: 160

    Thomas Jefferson was an American Founding Father, the principal author of the Declaration of...  more
  • 3

    John F. Kennedy

    Dec. at 46 (1917-1963)

    Alleged IQ: 160

    John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by initials JFK...  more
  • 4

    Alleged IQ: 159

    William Jefferson Clinton (born William Jefferson Blythe III; August 19, 1946) is an American...  more
  • 5

    Alleged IQ: 156.8

    James Earl Carter Jr. (born October 1, 1924) is an American politician and philanthropist who...  more
  • 6

    James Madison

    Dec. at 85 (1751-1836)

    Alleged IQ: 155

    James Madison Jr. (March 16, 1751 – June 28, 1836) was an American statesman, lawyer,...  more
  • 7

    John Adams

    Dec. at 91 (1735-1826)

    Alleged IQ: 155

    John Adams Jr. (October 30, 1735 – July 4, 1826) was an American statesman, attorney,...  more
  • 8

    Alleged IQ: 155

    Barack Hussein Obama born August 4, 1961is an American attorney and politician who served as...  more
  • 9

    Franklin D. Roosevelt

    Dec. at 63 (1882-1945)

    Alleged IQ: 150

    Franklin Delano Roosevelt (, ; January 30, 1882 – April 12, 1945), often referred to by...  more
  • 10

    Millard Fillmore

    Dec. at 74 (1800-1874)

    Alleged IQ: 149

    Millard Fillmore (January 7, 1800 – March 8, 1874) was the 13th president of the United States...  more
  • 11

    Franklin Pierce

    Dec. at 65 (1804-1869)

    Alleged IQ: 147

    Franklin Pierce (November 23, 1804 – October 8, 1869) was the 14th president of the United...  more
  • 12

    Rutherford B. Hayes

    Dec. at 71 (1822-1893)

    Alleged IQ: 146

    Rutherford Birchard Hayes (October 4, 1822 – January 17, 1893) was the 19th president of the...  more
  • 13

    Woodrow Wilson

    Dec. at 68 (1856-1924)

    Alleged IQ: 145.1

  • 14

    Benjamin Harrison

    Dec. at 68 (1833-1901)

    Alleged IQ: 145

    Benjamin Harrison (August 20, 1833 – March 13, 1901) was an American politician and lawyer who...  more
  • 15

    Andrew Jackson

    Dec. at 78 (1767-1845)

    Alleged IQ: 145

    Andrew Jackson (March 15, 1767 – June 8, 1845) was an American soldier and statesman who...  more
  • 16

    Alleged IQ: 145

    Donald John Trump (born June 14, 1946) is an American politician who served as the 45th...  more
  • 17

    Grover Cleveland

    Dec. at 71 (1837-1908)

    Alleged IQ: 144

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

    Theodore Roosevelt

    Dec. at 61 (1858-1919)

    Alleged IQ: 143

  • 19

    Alleged IQ: 143

    George Herbert Walker Bush (June 12, 1924 – November 30, 2018) was an American politician and...  more
  • 20

    Chester A. Arthur

    Dec. at 57 (1829-1886)

    Alleged IQ: 142

    Chester Alan Arthur (October 5, 1829 – November 18, 1886) was an American attorney and...  more
  • 21

    James A. Garfield

    Dec. at 50 (1831-1881)

    Alleged IQ: 141.5

  • 22

    Abraham Lincoln

    Dec. at 56 (1809-1865)

    Alleged IQ: 140

  • 23

    Lyndon B. Johnson

    Dec. at 65 (1908-1973)

    Alleged IQ: 140

    Lyndon Baines Johnson (; August 27, 1908 – January 22, 1973), often referred to as LBJ, was an...  more
  • 24

    George Washington

    Dec. at 67 (1732-1799)

    Alleged IQ: 140 

    George Washington was the first President of the United States, the Commander-in-Chief of the...  more
  • 25

    Gerald Ford

    Dec. at 93 (1913-2006)

    Alleged IQ: 140

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