The Booker Prize shortlist normally contains six books.
Judges begin with the eligible submissions and reduce them to a longlist of 12 or 13 titles, commonly called the Booker Dozen. They then select six finalists for the shortlist. From those six, the judging panel chooses the single winner, announced at the prize ceremony.
The six-book format gives the shortlist a clear role: it identifies the year’s final group of contenders while still offering readers enough variety in style, subject and background. Shortlisted authors also receive recognition and a financial award, while the winner receives the main prize and a substantial boost in readership.
The number is a normal rule, not an absolute guarantee that every historical edition has looked identical. Changes to prize administration or exceptional circumstances can affect formats, but six is the canonical answer for a standard Booker Prize question. The longlist’s larger number is the usual source of confusion.