Standard lumber sizes

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1. STANDARD LUMBER SIZES
Board lumber is specified by the
nominal (in name only) size.
Example:
1 x 6 1 x 8 2 x 4 2 x 6 2 x 8
Nomimal sizes are larger than actual
sizes.
Nominal size 2 x 4, actual size, 1 ½ x 3 ½”
**Always layout for the actual dimension of
the lumber!
Standard sizes of lumber are always
shown thickness before width.
Standard Lumber Sizes
Nominal Size Actual Size
1 x 2 ¾” x 1 ½”
1 x 4 ¾” x 3 ½”
1 x 6 ¾” x 5 ½”
1 x 8 ¾” x 7 ¼”
1 x 10 ¾” x 9 ¼”
1 x 12 ¾” x 11 ¼”
2 x 2 1 ½” x 1 ½”
2 x 4 1 ½” x 3 ½”
2 x 6 1 ½” x 5 ½”
2 x 8 1 ½” x 7 ¼”
2 x 10 1 ½” x 9 ¼”
2 x 12 1 ½” x 11 ¼”
4 x 4 3 ½” x 3 ½”
4 x 6 3 ½” x 5 ½”
6 x 6* 5 ½” x 5 ½”
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