Can U.S. Presidents Be Ranked by IQ?
A published model exists for early presidents, but its numbers are estimates—not test results.
QuestionWhat does the evidence actually support when a chart ranks presidents by IQ?
Read the method before the ranking
The estimates combine sparse retrospective IQ estimates with biographical ratings of intellectual brilliance and openness using missing-value estimation.
There is no single table value
Simonton reports four variants. The atlas preserves their minimum and maximum and explicitly says that span is not a test-score interval.
Do not invent estimates for later presidents
Obama, Trump, and Biden are outside the study. A viral 73 claim about Trump was unsupported, and debunking it does not reveal his actual IQ.
What the evidence supports