The research, published in the Proceedings of the Royal Society A, has said that Egypt's transformation to a pharaoh-ruled state was more rapid than previously thought.
Using radiocarbon dating and computer models, they believe the civilisation's first ruler, King Aha, came to power in about 3100 BC.
"The formation of Egypt was unique in the ancient world. It was a territorial state; a state from which the moment it formed had established borders over a territory in much the same way we think of nations today," Lead researcher Dr Michael Dee was quoted as saying by BBC.
Until now, the chronology of the earliest days of Egypt has been based on rough estimates.
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With no written records from this very early period, a timeline has been based on the evolving styles of ceramics unearthed from human burial sites.
Now though, scientists have used radiocarbon dating of excavated hair, bones and plants, with established archaeological evidence and computer models to pinpoint when the ancient state came into existence.
The Palermo Stone is inscribed with the names of early Egyptian kings
The team found that just a few hundred years later, by about 3100 BC, society had transformed to one ruled by a king.
"The time period is shorter than was previously thought, about 300 or 400 years shorter. Egypt was a state that emerged quickly, over that time one has immense social change," Dee said.
Archaeologists believe Egypt's first king, Aha, came to power after another prominent leader, Narmer, unified the land.