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Softwood Lumber - Standard Sizes

Nominal and minimum-dressed lumber sizes

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Softwood lumber standard sizes applied to boards, dimensional lumber and timber:

ItemThicknessFace Widths
NominalMinimum DressedNominalMinimum Dressed
Dry
(max 19% moisture content)
(inches)
Green
(inches)
Dry
(max 19% moisture content)
(inches)
Green
(inches)
Boards       2 1 1/2 1 9/16
      3 2 1/2 2 9/16
      4 3 1/2 3 9/16
3/8 5/16 11/32 5 4 1/2 4 5/8
1/2 7/16 15/32 6 5 1/2 5 5/8
5/8 9/16 19/32 7 6 1/2 6 5/8
3/4 5/8 11/16 8 7 1/4 7 1/2
1 3/4 25/32 9 8 1/4 8 1/2
1 1/4 1 1 1/32 10 9 1/4 9 1/2
1 1/2 1 1/4 1 9/32 11 10 1/4 10 1/2
      12 11 1/4 11 1/2
      14 13 1/4 13 1/2
      16 15 1/4 15 1/2
Dimension       2 1 1/2 1 9/16
      2 1/2 2 2 1/16
      3 2 1/2 2 9/16
2 1 1/2 1 9/16 3 1/2 3 3 1/16
2 1/2 2 2 1/16 4 3 1/2 3 9/16
3 2 1/2 2 9/16 4 1/2 4 4 1/16
3 1/2 3 3 1/16 5 4 1/2 4 5/8
4 3 1/2 3 9/16 6 5 1/2 5 5/8
4 1/2 4 4 1/16 8 7 1/4 7 1/2
      10 9 1/4 9 1/2
      12 11 1/4 11 1/2
      14 13 1/4 13 1/2
      16 15 1/4 15 1/2
Timbers 5 & 6 thick 1/2 off 1/2 off 5 & 6 wide 1/2 off 1/2 off
7 - 15 thick 3/4 off 1/2 off 7 - 15 wide 3/4 off 1/2 off
>= 16 thick 1 off 1/2 off >= 16 wide 1 off 1/2 off
  • 1 in (inch) = 25.4 mm
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  • en: american softwood lumber sizes standard
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