| Rank | Name | IQ | Born | Known For |
|---|---|---|---|---|
| 1 1st | Hermann von Helmholtz 🇩🇪 | 195 | 1821 | His mathematics of the eye, theories of vision, ideas on the visual perception of space, color visio… |
| 2 2nd | William Thomson, 1st Baron Kelvin 🇬🇧 | 185 | 1824 | Joule–Thomson effect Thomson effect (thermoelectric) Mirror galvanometer Siphon recorder Kelvin mat… |
| 3 3rd | Gerald Massey 🇬🇧 | 185 | 1828 | The Ballad of Babe Christabel (1854), War Waits (1855), Havelock's March (1860), and A Tale of Etern… |
| 4 | Macquorn Rankine 🇬🇧 | 180 | 1820 | Rankine scale Laws of thermodynamics Rankine–Hugoniot relation |
| 5 | Fyodor Dostoevsky 🇷🇺 | 180 | 1821 | Notes from Underground <br> Crime and Punishment <br> The Idiot <br> Demons <br> The Brothers Karama… |
| 6 | Ludwig Büchner 🇩🇪 | 180 | 1824 | Kraft und Stoff |
| 7 | Bernhard Riemann 🇩🇪 | 180 | 1826 | Riemann–von Mangoldt formula, Riemann bilinear relations, Cauchy–Riemann equations, Free Riemann gas… |
| 8 | Leo Tolstoy 🇷🇺 | 180 | 1828 | War and Peace, Anna Karenina, The Death of Ivan Ilyich, The Kingdom of God Is Within You, Resurrecti… |
| 9 | Henry Thomas Buckle 🇬🇧 | 175 | 1821 | History of Civilisation in England |
| 10 | Louis Pasteur 🇫🇷 | 175 | 1822 | Created the first vaccines for rabies <br> Cholera vaccine <br> Anthrax vaccines <br> Pasteurization |
| 11 | Rudolf Clausius 🇩🇪 | 175 | 1822 | Second law of thermodynamics <br> Originator of the concept of entropy <br> Clausius-Mossotti relati… |
| 12 | Alfred Russel Wallace 🇬🇧 | 175 | 1823 | Co-discovery of natural selection, Pioneering work on biogeography, Wallace Line Wallace effect |
| 13 | Gustav Kirchhoff 🇩🇪 | 175 | 1824 | Kirchhoff's circuit laws Kirchhoff's law of thermal radiation Kirchhoff's laws of spectroscopy Ki… |
| 14 | George Gore (electrochemist) | 175 | 1826 | His research with phosphorus |
| 15 | John Tyndall 🇮🇪 | 170 | 1820 | Atmosphere, physics education, Tyndall effect, diamagnetism, infrared radiation, Tyndallization |
The post-Napoleonic reconstruction era saw Europe settling into new political arrangements while science expanded rapidly in every direction. Colonial empires were at their peak, and explorers and naturalists were cataloguing the world's biodiversity. The seeds of Darwin's theory, Faraday's discoveries, and Babbage's computing engine were all being planted in these decades.
Hermann von Helmholtz is ranked #1 among geniuses born in the 1820s with an estimated IQ of 195, known for His mathematics of the eye, theories of vision, ideas on the visual perception of space, color vision research, and on t….
Our database includes 30 notable geniuses born between 1820–1829, spanning fields from science and mathematics to philosophy, literature, and the arts.
The average estimated IQ of documented geniuses born in the 1820s is 171, with the highest recorded being 195.
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