Early Life and Arrival in America
Thomas Fuller was born around 1710 somewhere in West Africa, in the region stretching between present-day Liberia and Benin. Around 1724, at roughly fourteen years old, he was captured, enslaved, and transported to Virginia, where he would live out his life on a plantation near Alexandria. He never learned to read or write a single word. Yet he became one of the most remarkable mental calculators of his century.
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Observers who tested him recorded almost unbelievable performances. Asked how many seconds a man had lived who was seventy years, seventeen days, and twelve hours old, Fuller paused, worked silently, and returned the figure 2,210,500,800 — having accounted, on his own, for the leap years across that span. When one of his questioners, computing the sum on paper, told him the answer seemed too large, Fuller calmly pointed out that the questioner had forgotten the leap years. He was right.
Abolitionist Recognition
His abilities drew the attention of figures in the early American antislavery movement. The Philadelphia physician and abolitionist Benjamin Rush wrote an account of Fuller, presenting his genius as plain evidence against the racist claim that Africans were intellectually inferior — an argument used to indict the institution that had enslaved him.
Death and Legacy
Fuller died in 1790, around the age of eighty. He left no writings, because he could compose none; his entire body of work existed only in the moments he spoke his answers aloud. He is remembered today as "the Virginia Calculator," a mind whose brilliance survived a life designed to erase it.
Achievements
- Performed complex multi-digit multiplications and time conversions entirely in his head
- Correctly computed the number of seconds in a person's lifetime of 70 years, 17 days, 12 hours — answering faster than it could be worked on paper
- Cited by abolitionists, including physician Benjamin Rush, as evidence of the intellectual capacity of Africans
