READ All The US Presidents, Ranked By IQ  

Lauren Slocum
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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. 

1
John Quincy Adams is listed (or ranked) 1 on the list All The US Presidents, Ranked By IQ
John Quincy Adams Died at 81 (1767-1848)

Alleged IQ: 175

John Quincy Adams was an American statesman who served as the sixth President of the United States from 1825 to 1829. He also served as a diplomat, a Senator and member of the House of ...more

2
Thomas Jefferson is listed (or ranked) 2 on the list All The US Presidents, Ranked By IQ
Thomas Jefferson Died at 83 (1743-1826)

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 ...more

3
John F. Kennedy is listed (or ranked) 3 on the list All The US Presidents, Ranked By IQ
John F. Kennedy Died at 46 (1917-1963)

Alleged IQ: 160

John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), also referred to as John F. Kennedy, JFK, John Kennedy or Jack Kennedy, was the 35th President of the United States. He served from ...more

4
Bill Clinton is listed (or ranked) 4 on the list All The US Presidents, Ranked By IQ
Bill Clinton age 72

Alleged IQ: 159

William Jefferson "Bill" Clinton is an American politician who served as the 42nd President of the United States from 1993 to 2001. Previously, he served as Governor of Arkansas from ...more

5
Jimmy Carter is listed (or ranked) 5 on the list All The US Presidents, Ranked By IQ
Jimmy Carter age 94

Alleged IQ: 156.8

James Earl "Jimmy" Carter, Jr. is an American politician, author, and member of the Democratic Party who served as the 39th President of the United States from 1977 to 1981. He was ...more

6
James Madison is listed (or ranked) 6 on the list All The US Presidents, Ranked By IQ
James Madison Died at 85 (1751-1836)

Alleged IQ: 155

James Madison, Jr. was an American statesman, political theorist, and the fourth President of the United States. He is hailed as the "Father of the Constitution" for being instrumental ...more

7
John Adams is listed (or ranked) 7 on the list All The US Presidents, Ranked By IQ
John Adams Died at 91 (1735-1826)

Alleged IQ: 155

John Adams was the second president of the United States, having earlier served as the first vice president of the United States. An American Founding Father, Adams was a statesman, diplomat, ...more

8
Barack Obama is listed (or ranked) 8 on the list All The US Presidents, Ranked By IQ
Barack Obama age 57

Alleged IQ: 155

Barack Hussein Obama II (born August 4, 1961) is an American politician who served as the 44th President of the United States from 2009 to 2017. The first African American to assume the ...more

9
Franklin D. Roosevelt is listed (or ranked) 9 on the list All The US Presidents, Ranked By IQ
Franklin D. Roosevelt Died at 63 (1882-1945)

Alleged IQ: 150

Franklin Delano Roosevelt, commonly known by his initials FDR, was an American statesman and political leader who served as the 32nd President of the United States. A Democrat, he won a record ...more

10
Millard Fillmore is listed (or ranked) 10 on the list All The US Presidents, Ranked By IQ
Millard Fillmore Died at 74 (1800-1874)

Alleged IQ: 149

Millard Fillmore was the 13th President of the United States, the last Whig president, and the last president not to be affiliated with either the Democratic or Republican parties. Fillmore was ...more

11
Franklin Pierce is listed (or ranked) 11 on the list All The US Presidents, Ranked By IQ
Franklin Pierce Died at 65 (1804-1869)

Alleged IQ: 147

Franklin Pierce was the 14th President of the United States. Genial and well-spoken, Pierce was a northern Democrat who saw the abolitionist movement as a fundamental threat to the unity of the ...more

12
Rutherford B. Hayes is listed (or ranked) 12 on the list All The US Presidents, Ranked By IQ
Rutherford B. Hayes Died at 71 (1822-1893)

Alleged IQ: 146

Rutherford Birchard Hayes was the 19th President of the United States. As president, he oversaw the end of Reconstruction, began the efforts that led to civil service reform, and attempted to ...more

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13
Woodrow Wilson is listed (or ranked) 13 on the list All The US Presidents, Ranked By IQ
Woodrow Wilson Died at 68 (1856-1924)

Alleged IQ: 145.1

Thomas Woodrow Wilson was the 28th President of the United States from 1913 to 1921 and leader of the Progressive Movement. A Southerner with a PhD in political science, he served as President ...more

14
Benjamin Harrison is listed (or ranked) 14 on the list All The US Presidents, Ranked By IQ
Benjamin Harrison Died at 68 (1833-1901)

Alleged IQ: 145

Benjamin Harrison was the 23rd President of the United States; he was the grandson of the ninth President, William Henry Harrison. Harrison had become a prominent local attorney, Presbyterian ...more

15
Andrew Jackson is listed (or ranked) 15 on the list All The US Presidents, Ranked By IQ
Andrew Jackson Died at 78 (1767-1845)

Alleged IQ: 145

Andrew Jackson was the seventh President of the United States. He was born near the end of the colonial era, somewhere near the then-unmarked border between North and South Carolina, into a ...more

16
Donald Trump is listed (or ranked) 16 on the list All The US Presidents, Ranked By IQ
Donald Trump

Alleged IQ: 145

Donald John Trump (born June 14, 1946) is the 45th and current President of the United States, in office since January 20, 2017. Before entering politics, he was a businessman and television ...more

17
Grover Cleveland is listed (or ranked) 17 on the list All The US Presidents, Ranked By IQ
Grover Cleveland Died at 71 (1837-1908)

Alleged IQ: 144

Stephen Grover Cleveland was the 22nd and 24th President of the United States. He was the winner of the popular vote for president three times—in 1884, 1888, and 1892—and was one of the two ...more

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18
Theodore Roosevelt is listed (or ranked) 18 on the list All The US Presidents, Ranked By IQ
Theodore Roosevelt Died at 61 (1858-1919)

Alleged IQ: 143

Theodore "T.R." Roosevelt Jr. was an American politician, author, naturalist, soldier, explorer, and historian who served as the 26th President of the United States. He was a leader of ...more

19
George H. W. Bush is listed (or ranked) 19 on the list All The US Presidents, Ranked By IQ
George H.W. Bush age 94

Alleged IQ: 143

George Herbert Walker Bush is a retired American politician who served as the 41st President of the United States from 1989 to 1993. A Republican, he had previously served as the 43rd Vice ...more

20
Chester A. Arthur is listed (or ranked) 20 on the list All The US Presidents, Ranked By IQ
Chester A. Arthur Died at 57 (1829-1886)

Alleged IQ: 142

Chester Alan Arthur was the 21st President of the United States; he succeeded James Garfield upon the latter's assassination. At the outset, Arthur struggled to overcome his reputation, stemming ...more

21
James A. Garfield is listed (or ranked) 21 on the list All The US Presidents, Ranked By IQ
James A. Garfield Died at 50 (1831-1881)

Alleged IQ: 141.5

James Abram Garfield served as the 20th President of the United States, after serving nine terms in the U.S. House of Representatives. Garfield's presidency lasted just 200 days—from March 4, ...more

22
Abraham Lincoln is listed (or ranked) 22 on the list All The US Presidents, Ranked By IQ
Abraham Lincoln Died at 56 (1809-1865)

Alleged IQ: 140

Abraham Lincoln was the 16th President of the United States, serving from March 1861 until his assassination in April 1865. Lincoln led the United States through its Civil War—its bloodiest war ...more

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23
Lyndon B. Johnson is listed (or ranked) 23 on the list All The US Presidents, Ranked By IQ
Lyndon B. Johnson Died at 65 (1908-1973)

Alleged IQ: 140

Lyndon Baines Johnson, often referred to as LBJ, was the 36th President of the United States, a position he assumed after his service as the 37th Vice President. Johnson, a Democrat from Texas, ...more

24
George Washington is listed (or ranked) 24 on the list All The US Presidents, Ranked By IQ
George Washington Died at 67 (1732-1799)

Alleged IQ: 140 

George Washington was the first President of the United States, the Commander-in-Chief of the Continental Army during the American Revolutionary War, and one of the Founding Fathers of the ...more

25
Gerald Ford is listed (or ranked) 25 on the list All The US Presidents, Ranked By IQ
Gerald Ford Died at 93 (1913-2006)

Alleged IQ: 140

Gerald Rudolph "Jerry" Ford Jr. was the 38th President of the United States, serving from 1974 to 1977, and, prior to this, was the 40th Vice President of the United States serving ...more

26
George W. Bush is listed (or ranked) 26 on the list All The US Presidents, Ranked By IQ
George W. Bush age 72

Alleged IQ: 139

George Walker Bush is an American politician and businessman who served as the 43rd President of the United States from 2001 to 2009, and the 46th Governor of Texas from 1995 to 2000. The eldest ...more

27
James Monroe is listed (or ranked) 27 on the list All The US Presidents, Ranked By IQ
James Monroe Died at 73 (1758-1831)

Alleged IQ: 139

James Monroe was the fifth President of the United States. Monroe was the last president who was a Founding Father of the United States and the last president from the Virginia dynasty and the ...more

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28
John Tyler is listed (or ranked) 28 on the list All The US Presidents, Ranked By IQ
John Tyler Died at 72 (1790-1862)

Alleged IQ: 136.2

John Tyler was the tenth President of the United States. He was elected vice president on the 1840 Whig ticket with William Henry Harrison, and became president after his running mate's death in ...more

29
Martin Van Buren is listed (or ranked) 29 on the list All The US Presidents, Ranked By IQ
Martin Van Buren Died at 80 (1782-1862)

Alleged IQ: 133

Martin Van Buren was the eighth President of the United States. A member of the Democratic Party, he served in a number of senior roles, including eighth Vice President and Secretary of State, ...more

30
William Henry Harrison is listed (or ranked) 30 on the list All The US Presidents, Ranked By IQ
William Henry Harrison Died at 68 (1773-1841)

Alleged IQ: 132

William Henry Harrison was the ninth President of the United States, an American military officer and politician, and the last President born as a British subject. He was also the first ...more

31
Dwight D. Eisenhower is listed (or ranked) 31 on the list All The US Presidents, Ranked By IQ
Dwight D. Eisenhower Died at 79 (1890-1969)

Alleged IQ: 132

Dwight David "Ike" Eisenhower was the 34th President of the United States from 1953 until 1961. He was a five-star general in the United States Army during World War II and served as ...more

32
Richard Nixon is listed (or ranked) 32 on the list All The US Presidents, Ranked By IQ
Richard Nixon Died at 81 (1913-1994)

Alleged IQ: 132

Richard Milhous Nixon was the 37th President of the United States, serving from 1969 to 1974. The only U.S. president to resign the office, Nixon had previously served as a U.S. representative ...more

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33
James K. Polk is listed (or ranked) 33 on the list All The US Presidents, Ranked By IQ
James K. Polk Died at 54 (1795-1849)

Alleged IQ: 130.2

James Knox Polk was the 11th President of the United States. Polk was born in Mecklenburg County, North Carolina. He later lived in and represented Tennessee. A Democrat, Polk served as the 17th ...more

34
Herbert Hoover is listed (or ranked) 34 on the list All The US Presidents, Ranked By IQ
Herbert Hoover Died at 90 (1874-1964)

Alleged IQ: 130

Herbert Clark Hoover was the 31st President of the United States. He was a professional mining engineer, and was raised as a Quaker. A Republican, Hoover served as head of the U.S. Food ...more

35
William McKinley is listed (or ranked) 35 on the list All The US Presidents, Ranked By IQ
William McKinley Died at 58 (1843-1901)

Alleged IQ: 130

William McKinley was the 25th President of the United States, serving from March 4, 1897, until his assassination in September 1901, six months into his second term. McKinley led the nation to ...more

36
Ronald Reagan is listed (or ranked) 36 on the list All The US Presidents, Ranked By IQ
Ronald Reagan Died at 93 (1911-2004)

Alleged IQ: 130

Ronald Wilson Reagan was the 40th President of the United States. Before his presidency he served as the 33rd Governor of California and was also an actor from 1937–1964. Born and raised in ...more

37
James Buchanan is listed (or ranked) 37 on the list All The US Presidents, Ranked By IQ
James Buchanan Died at 77 (1791-1868)

Alleged IQ: 129

James Buchanan, Jr. was the 15th President of the United States, serving immediately prior to the American Civil War. He represented Pennsylvania in the United States House of Representatives ...more

38
Zachary Taylor is listed (or ranked) 38 on the list All The US Presidents, Ranked By IQ
Zachary Taylor Died at 66 (1784-1850)

Alleged IQ: 129

Zachary Taylor was the 12th President of the United States, serving from March 1849 until his death in July 1850. Before his presidency, Taylor was a career officer in the United States Army, ...more

39
Harry S. Truman is listed (or ranked) 39 on the list All The US Presidents, Ranked By IQ
Harry S. Truman Died at 88 (1884-1972)

Alleged IQ: 128

Harry S. Truman (May 8, 1884 – December 26, 1972) was an American statesman who served as the 33rd President of the United States (1945–1953), taking the office upon the death of Franklin D. ...more

40
William Howard Taft is listed (or ranked) 40 on the list All The US Presidents, Ranked By IQ
William Howard Taft Died at 73 (1857-1930)

Alleged IQ: 126

William Howard Taft was the 27th President of the United States and later the tenth Chief Justice of the United States. He is the only person to have served in both of these offices. Before ...more

41
Calvin Coolidge is listed (or ranked) 41 on the list All The US Presidents, Ranked By IQ
Calvin Coolidge Died at 61 (1872-1933)

Alleged IQ: 127

John Calvin Coolidge Jr. was the 30th President of the United States. A Republican lawyer from Vermont, Coolidge worked his way up the ladder of Massachusetts state politics, eventually becoming ...more

42
Andrew Johnson is listed (or ranked) 42 on the list All The US Presidents, Ranked By IQ
Andrew Johnson Died at 67 (1808-1875)

Alleged IQ: 125

Andrew Johnson was the 17th President of the United States, serving from 1865 to 1869. Johnson became president as he was vice president at the time of President Abraham Lincoln's assassination. ...more

43
Warren G. Harding is listed (or ranked) 43 on the list All The US Presidents, Ranked By IQ
Warren G. Harding Died at 58 (1865-1923)

Alleged IQ: 124

Warren Gamaliel Harding was the 29th President of the United States, a Republican from Ohio who served in the Ohio Senate and then in the United States Senate, where he played a minor role. With ...more

44
Ulysses S. Grant is listed (or ranked) 44 on the list All The US Presidents, Ranked By IQ
Ulysses S. Grant Died at 63 (1822-1885)

Alleged IQ: 120

Ulysses S. Grant was the 18th President of the United States. As Commanding General, Grant worked closely with President Abraham Lincoln to lead the Union Army to victory over the Confederacy in ...more