The nominal thicknesses of plywood range from 1/8 inch, or 3.2 mm, to 1 1/4 inches, which is equivalent to 31.75 mm. these often aren't the actual thicknesses, however, because sanding during manufacturing removes up to 1/32 inch of material. thus, a plywood sheet with a nominal thickness of 3/8 inch is actually 11/32 inch thick.. Common plywood dimensions. plywood is most often sold in 4? x 8? sheets, but may also be available in 4? x 10?, 4? x 12?, or 2? x 4? sheets. our plywood calculator can estimate the number of 4? x 8? sheets needed for a project. plywood is usually sold by the sheet, but in some cases it may be sold by the board foot.. B. sheet sizes. plywood comes in several different thicknesses, widths, and lengths to meet the needs of your project. a
