Abraham de Moivre was one of the most gifted mathematicians of the 18th century — a close friend of Isaac Newton, a pioneer of probability theory, and the man who first described the normal distribution that underpins modern statistics. He spent his career developing tools to calculate the likelihood of future events. And at the end of his life, he apparently used those tools to calculate his own death — and got it right.
De Moivre spent the last years of his life in London, elderly, increasingly frail, and sleeping more each day than the last. According to the account that has been passed down through mathematical history, he noticed that he was sleeping 15 minutes longer each night — a pattern consistent enough that he treated it as data. He calculated that if this progression continued, he would sleep a full 24 hours on November 27, 1754. He predicted that would be the day he died.
He died on November 27, 1754.
The story has been repeated in mathematical circles for over two centuries, and its accuracy is difficult to fully verify — the primary sources are secondhand accounts written after the fact. But the broad outlines are well-documented enough that historians of mathematics take it seriously, and the date of death is confirmed. Whether de Moivre genuinely calculated it or whether the story accrued its details over time, it has become one of the strangest footnotes in the history of science.
What makes the story resonant beyond its eerie conclusion is what it says about de Moivre's mind. He was a man who had spent his entire career insisting that randomness follows patterns — that probability wasn't chaos but structure waiting to be found. Applying that framework to his own biology, in the final weeks of his life, is entirely consistent with how he thought about everything else.
De Moivre died in poverty, never having received the academic appointment he spent decades seeking. He was French-born but spent most of his life in England after fleeing religious persecution, and despite being one of the most respected mathematicians in Europe, he supported himself by tutoring and never held a university chair. The man who helped invent the mathematics of chance died without the recognition his work deserved — but with, apparently, a very precise sense of when it was coming.
