Do you want to know the size of the tournament chessboard (In other words, the dimensions of a chessboard)?
The Size of the Tournament Chessboard
The size of the tournament chessboard is, square size should be anywhere from 2 inches to 2.5 inches, while the king’s height should be 3.375 inches to 4.5 inches according to The United States Chess Federation (USCF).
According to FIDE, the square size should be anywhere from 1.97 inches (5cm) to 2.36 inches(6cm), while the king’s height should be 3.74 inches(9.75cm).
Chessboard and Piece Guidelines
According to the above, usually square size of a chessboard should be anywhere from 1.9 inches to 2.5 inches. Again this might be different according to country rules. And there should be fit four pawns into one square and it is a great way to test whether t your chessboard has enough space.