Quick answer
Tournament chess boards generally use squares of roughly 2 to 2.5 inches (about 5 to 6 cm). A square of about 2.25 inches (57 mm) is a very common choice. That usually means an overall board of around 20 inches across for a roll-up or vinyl board, and a little more for a wooden board with a frame. Rules vary by event and federation, so check the organizer’s requirements.
Square size versus overall board size
Boards are advertised by overall width, but what matters for play is the size of each square. An 8 by 8 board with 2.25 inch squares has a playing area of 18 inches. Borders, frames or printed coordinates add to this, which is why “20 inch” and “21 inch” boards often have similar square sizes. When comparing boards, look for the square measurement, not just the outside dimension.
What federations recommend
- FIDE guidance, as commonly cited, is for squares between about 5 and 6 cm (roughly 2 to 2.4 inches), with a king around 9.5 cm tall.
- US Chess guidance, as commonly cited, allows squares from about 2 to 2.5 inches, with a king of roughly 3.375 to 4.5 inches. A 2.25 inch square with a king around 3.75 inches is a widely used pairing.
These figures are summaries. If you are entering a rated event, read the current equipment rules from the federation or ask the tournament director. Many tournaments also supply equipment, so you may not need your own.
The pieces have to fit the squares
Board and pieces should be bought as a pair. As a rule of thumb, a piece base should sit comfortably inside a square, roughly three-quarters of its width, so pieces do not crowd each other or tip onto neighboring squares. Oversized pieces on small squares make play awkward, and tiny pieces on large squares are harder to see. If you are setting up before a game, see proper chess board setup for where each piece goes.
Is a 21 inch board too big, or a 12 inch board too small?
A 21 inch board with a frame often has squares close to 2.25 inches, which is within the typical tournament range, so it is not too big for tournament play, although it takes more table space. A 12 inch board has squares of about 1.5 inches. That is fine for travel, study or casual games but is smaller than the usual tournament range.
Is a chess board 8x8 or 10x10?
Standard chess is played on an 8 by 8 board with 64 squares. Larger boards, such as 10 by 8 or 10 by 10, belong to chess variants and are not used in normal tournament chess.
Board materials
Roll-up vinyl boards are popular at events because they are light, inexpensive and flat. Wooden and plastic boards are also common. Whichever you choose, the squares should have a clear contrast between light and dark, and the board should be oriented correctly; see which way the chess board goes.
FAQ
What chess board is used in tournaments?
Often a roll-up vinyl or similar board with squares of about 2.25 inches, paired with weighted pieces with a king around 3.75 inches.
Is a 21 inch chess board too big?
For most tables, no. It depends on the table size and the squares it has.
Is a 12 inch chess board too small?
For tournaments, usually yes. It suits casual and travel play.