More than two million Raspberry Pi computers have been sold around the world since the low-cost PC was launched in February 2012.
Announcing the milestone, Raspberry Pi Foundation spokeswoman Liz Upton said sales were actually speeding up.
"It took us almost exactly a year to sell the first million Raspberry Pis," she wrote. "Going on that basis, we calculated that we might, if we were lucky, reach the second million around January 2014, or slightly afterwards – we were confident we’d get there by the end of February 2014."
Upton said it was "a bit of a shock" to discover the foundation had hit its target three months ahead of schedule.
"We don’t know who owns it – if you bought one between 24 October and 31 October, it might be yours," she said. "It could even be the one we gave to Prince Andrew when he visited on Halloween."
Good for education
The achievement will highlight Raspberry's Pi's continued popularity, with founder Eben Upton suggesting last month there was a "latent need" for a low-cost educational PC.
Liz Upton also described the Raspberry Pi's early history, when the original 2,000 units were manufactured in China.
"And on getting the news about the two millionth Pi at the end of last week, it struck us that every single Raspberry Pi in that [initial] pallet represents 1,000 of the Raspberry Pis that are spread around the world today," she said.
Production later shifted to the UK, with the millionth computer rolling off production lines last month.
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