Chess Set Station

Chess set size calculator

Match king height to square size, with FIDE and US Chess ranges side by side.

Check your chess set size

Enter the side of one board square. Add your king's height to check that the set fits the board.

Quick answer. For a tournament board with 2.25-inch (57 mm) squares, use a king about 3.75 to 4 inches (95 to 102 mm) tall with a base of 40 to 50% of that height.

Chess set size chart

MeasureFIDEUS Chess
Square side5 to 6 cm (about 2 to 2.4 in)2 to 2.5 in (about 5.1 to 6.4 cm)
King height95 mm, with up to 10% variance (about 8.6 to 10.5 cm)3.375 to 4.5 in (about 8.6 to 11.4 cm)
King base width40 to 50% of the king's height40 to 50% of the king's height; about 78% of the square or less
Typical tournament setKing 95 mm, square 5 to 6 cmKing 3.75 in, square 2.25 in

FIDE's standard says four pawns must fit comfortably on one square. US Chess figures come from a club FAQ and a rulebook quote on the US Chess forum (see sources), so check the current US Chess rulebook before buying for a rated event.

Key takeaway. For a 2.25-inch (57 mm) square, look for a king about 3.75 to 4 inches (95 to 102 mm) tall.

How to measure in 3 steps

  1. Measure one square. Use a ruler across one playing square, edge to edge, not the whole board.
  2. Measure the king. Stand it on a flat surface and measure to the top of the crown. Then measure its base across the widest part.
  3. Compare. Enter the numbers above. The king's base should fill most of a square, but not touch the edges.
Top viewsquare sidebaseking heightbase widthSide view
Measure the square side, the king's height and the width of its base.

Common sizing mistakes

MistakeBetter habit
Measuring the whole boardMeasure one square. A board's outer size includes its border.
Buying by the 'size 4' or 'size 5' labelMakers use different labels. Check the king height in inches or millimetres on the listing.
Choosing a king that is too wideIf the base is close to the square's edges, pieces collide when you move them.

Frequently asked questions

What size squares does a tournament chess board have?
FIDE says 5 to 6 cm per side. US Chess guidance is 2 to 2.5 inches. A common tournament board uses 2.25-inch (57 mm) squares.
How tall should a chess king be?
FIDE lists 95 mm with up to 10% variance. US Chess guidance is 3.375 to 4.5 inches, and about 3.75 to 4 inches is most common.
How wide should the king's base be?
FIDE says a piece's base should be 40 to 50% of its height. The US Chess guidance quoted on its forum is about 78% of the square or less.
What king size fits a 2-inch square?
Using the ratios above, about 3.1 to 3.9 inches (roughly 80 to 99 mm). Use the checker to see the range for your exact board.
Do my pieces fit my board?
Enter the square side and your king's height in the checker. If the base is 78% of the square or less, it fits comfortably.
Does a bigger set play better?
Not by itself. Pieces should be big enough to handle easily but small enough not to crowd the squares. Tournament sizes are a good default.
Are the size numbers official rules?
FIDE and US Chess set equipment standards for their events. For home play they are a useful guide, not a requirement.

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Last checked: . We read these sources when writing this page:

FIDE Article 2 gives the starting position as a diagram; the piece-by-piece placement in words comes from the Wikipedia rules page, which matches the diagram.

US Chess rules and Britannica could not be read (HTTP 403) on the check date, so they are not cited.

Equipment sizes: FIDE figures are read from the FIDE Handbook page. US Chess figures come from a club FAQ and a US Chess forum thread quoting the rulebook, because the rulebook text itself was not readable; check the current US Chess rulebook before buying for a rated event.