Standard Sizes of Yard Lumber

Type of Lumber Nominal size (in inches) Actual size (in inches)
  Thickness Width Thickness Width
Dimension 2 4 1 1/2 3 1/2
  2 6 1 1/2 5 1/2
  2 8 1 1/2 7 1/4
  2 10 1 1/2 9 1/4
  2 12 1 1/2 11 1/4
Timbers 4 6 3 1/2 5 1/2
  4 8 3 1/2 7 1/4
  4 10 3 1/2 9 1/4
  6 6 5 1/2 5 1/2
  6 8 5 1/2 7 1/4
  6 10 5 1/2 9 1/4
  8 8 7 1/4 7 1/4
  8 10 7 1/4 9 1/4
Common boards 1 4 3/4 3 1/2
  1 6 3/4 5 1/2
  1 8 3/4 7 1/4
  1 10 3/4 9 1/4
  1 12 3/4 11 1/4