All The US Presidents, Ranked By IQ

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.

Photo:
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Alleged IQ: 145.1

  • 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
  • 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
  • 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
  • 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
  • Alleged IQ: 143

  • 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
  • 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
  • Alleged IQ: 141.5

  • Alleged IQ: 140

  • 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
  • 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
  • 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