James Madison IQ

James Madison was born in Virginia in 1751 into a planter family that held enslaved people. He completed the course at the College of New Jersey, now Princeton, in about two years and stayed on to study Hebrew and political philosophy. He drafted the Virginia Plan, kept the main record of the 1787 Constitutional Convention, wrote 29 of the Federalist Papers and drafted the Bill of Rights. He served as Secretary of State and as the fourth president, from 1809 to 1817. He died in 1836.

He was never tested. Psychologist Dean Keith Simonton estimated every president's IQ in 2006; Madison's II-C figure is 160, tied with Jefferson behind only John Quincy Adams. The average of Simonton's four versions is about 141, so LifeScore shows a range of 140 to 160.

He arrived at the 1787 Convention with a detailed plan, the Virginia Plan, that set the agenda; he took the fullest notes of the debates; and he explained and defended the result in the Federalist Papers. He later drafted the amendments that became the Bill of Rights.

Historians rate his presidency below his constitutional work. The War of 1812 went badly at first, and British troops burned Washington in 1814. The war ended in a draw and a burst of national confidence, and he left office popular.

Madison reasoned from evidence. Before designing a government he studied why past republics failed, then built in checks so that "ambition must be made to counteract ambition". That is systems design: predict how parts will behave and arrange them so the whole stays stable.

What supports it

• Simonton (2006) gives Madison 160 in version II-C.
• His notes are the main record of the Constitutional Convention.
• His Federalist essays are still cited by the US Supreme Court.

What it cannot prove

• Simonton built most presidential figures statistically from expert ratings, so neighbouring presidents cannot really be told apart.
• The four Simonton versions for Madison spread widely, so the range is broad.
• He enslaved people throughout his life, a fact separate from any estimate of ability.

James Madison's IQ is represented here by a retrospective estimate of 160, not a verified test result. James Madison is best known for exceptional political theory. The useful question is what the surviving evidence shows, not whether a precise modern score can be recovered.

Small, quiet and formidably prepared. The best-read man at the Constitutional Convention.

The dominant archetype here is The Architect. This archetype shapes decision patterns: what feels natural, what creates friction, and what blind spots tend to emerge.

Estimated IQ is 160. This is a rough estimate based on documented accomplishments and contemporary accounts, not a literal measurement.

He and Thomas Jefferson once took a "botanising" tour of New York and New England that was partly political recruiting.

James Madison's estimate of 160 falls in the profoundly gifted IQ range. Want your own number rather than James's? Take the free IQ test or the quick IQ test. See what an IQ of 160 means, place it on the IQ chart or check how rare it is with the IQ rarity calculator.