Home > Chess Boards and Pieces > Conversion information, Inches to MM

Inches to MM conversion table. I like the simple one on the Google page, as shown here.

Here is some quick information with some of my common measurements

3" = 76.2mm
2.5" = 63.5mm

3" boards are designed for 3" chess pieces. The average dimensions for a 3" board is 560mm x 864mm depending on the frame. The average dimensions for a 2.5" board is 508mm x 762 depending on the frame.