How Wide Is a 1×6 Board

1×4 and 1×6 boards lose 1/4 inch in thickness and 1/2 inch in width before leaving the mill. That means a 1 x 4 board is actually 3/4 inches by 3 1/2 inches. The larger 1x boards (1×8, 1×10, etc.) lose 3/4 inch in width.

Is a 2x6 actually 6 inches?

Nominal MeasurementActual (inches)Actual (mm)2 x 61-1/2 x 5-1/238 x 1402 x 81-1/2 x 7-1/438 x 1842 x 101-1/2 x 9-1/438 x 2352 x 121-1/2 x 11-1/438 x 286

Why is dimensional lumber not actual size?

The “nominal” cross-section dimensions of a piece of lumber, such as 2 X 4 or 1 X 6, are always somewhat larger than the actual, or dressed, dimensions. The reason is that dressed lumber has been surfaced or planed smooth on four sides (called S4S). The nominal measurement is made before the lumber is surfaced.