Device size
The chessboard is a square whose side equals the device's shortest side.
Calibrate real-world size
Match the blue rectangle to a credit card (85.60×53.98 mm) so sizes are true to life.
Piece diameters (mm)
king: 16.946 · queen: 16.946 · rook: 16.946 · bishop: 15.118 · knight: 15.118 · pawn: 12.279