America

All The US Presidents, Ranked By IQ  

Lauren Slocum
103.7k views 44 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.

1
John Quincy Adams is listed (or ranked) 1 on the list All The US Presidents, Ranked By IQ
Dec. 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
Dec. 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
Dec. 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
age 73

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
age 95

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
Dec. 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
Dec. 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
age 58

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
Dec. at 63 (1882-1945)

Alleged IQ: 150

Franklin Delano Roosevelt (January 30, 1882 – April 12, 1945), often referred to by his initials FDR, was an American statesman and political leader who served as the 32nd President of the ...more
10
Millard Fillmore is listed (or ranked) 10 on the list All The US Presidents, Ranked By IQ
Dec. 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
Dec. 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
Dec. 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
13
Woodrow Wilson is listed (or ranked) 13 on the list All The US Presidents, Ranked By IQ
Dec. 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
Dec. 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
Dec. 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

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
Dec. 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
18
Theodore Roosevelt is listed (or ranked) 18 on the list All The US Presidents, Ranked By IQ
Dec. 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
age 95

Alleged IQ: 143

George Herbert Walker Bush (June 12, 1924 - November 30, 2018) was an American politician who served as the 41st President of the United States from 1989 to 1993. Prior to assuming the ...more
20
Chester A. Arthur is listed (or ranked) 20 on the list All The US Presidents, Ranked By IQ
Dec. at 57 (1829-1886)

Alleged IQ: 142

Chester Alan Arthur was the 21st President of the United States; he succeeded James Garfield. At the outset, Arthur struggled to overcome his reputation, stemming from his beginnings in politics ...more
21
James A. Garfield is listed (or ranked) 21 on the list All The US Presidents, Ranked By IQ
Dec. 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 was raised in humble circumstances on an Ohio farm ...more
22
Abraham Lincoln is listed (or ranked) 22 on the list All The US Presidents, Ranked By IQ
Abraham Lincoln Dec. at 56 (1809-1865)

Alleged IQ: 140

Abraham Lincoln was the 16th President of the United States, serving from March 1861 until his life was taken in April 1865. Lincoln led the United States and its greatest moral, constitutional ...more
23
Lyndon B. Johnson is listed (or ranked) 23 on the list All The US Presidents, Ranked By IQ
Dec. 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
Dec. 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, and one of the Founding Fathers of the United States. He presided over the ...more
25
Gerald Ford is listed (or ranked) 25 on the list All The US Presidents, Ranked By IQ
Dec. 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