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Softwood Lumber - Dimensions

Commercial softwood lumber dimension chart - nominal and actual sizes

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Dimensional lumber is a term used for lumber that is finished - planed and cut - to a standardized width and depth specified in inches.

Structural lumber - dimensions

Commercial lumber dimensions - American Softwood Lumber Standards - nominal and actual sizes are indicated in the table below.

General rule converting nominal to actual softwood dimensions

  • subtract 1/4 inch for dimensions under 2 inches (51 mm)
  • subtract 1/2 inch for dimensions under 8 inches (200 mm)
  • subtract 3/4 inch for larger dimensions
Nominal Size
(in x in)
Actual Size 
(in x in)(mm x mm)Weight
(lb/ft)
1 x 1 3/4 x 3/4 19 x 19 0.14
1 x 2 3/4 x 1 1/2 19 x 38 0.27
1 x 3 3/4 x  2 1/2 19 x 64 0.47
1 x 4 3/4 x 3 1/2 19 x 89 0.64
1 x 6 3/4 x 5 1/2 19 x 140 1.00
1 x 8 3/4 x 7 1/4 19 x 184 1.32
1 x 10 3/4 x 9 1/4 19 x 235 1.69
1 x 12 3/4 x 11 1/4 19 x 286 2.05
2 x 2 1 1/2 x 1 1/2 38 x 38 0.55
2 x 3 1 1/2 x 2 1/2 38 x 64 0.94
2 x 4 1 1/2 x 3 1/2 38 x 89 1.28
2 x 6 1 1/2 x 5 1/2 38 x 140 2.00
2 x 8 1 1/2 x 7 1/4 38 x 184 2.64
2 x 10 1 1/2 x 9 1/4 38 x 235 3.37
2 x 12 1 1/2 x 11 1/4 38 x 286 4.10
2 x 14 1 1/2 x 13 1/4 38 x 337 4.83
3 x 3 2 1/2 x 2 1/2 64 x 64 1.52
3 x 4 2 1/2 x 3 1/2 64 x 89 2.13
3 x 6 2 1/2 x 5 1/2 64 x 140 3.34
3 x 8 2 1/2 x 7 1/4 64 x 184 4.41
3 x 10 2 1/2 x 9 1/4 64 x 235 5.62
3 x 12 2 1/2 x 11 1/4 64 x 286 6.84
3 x 14 2 1/2 x 13 1/4 64 x 337 8.05
3 x 16 2 1/2 x 15 1/4 64 x 387 9.27
4 x 4 3 1/2 x 3 1/2 89 x 89 2.98
4 x 6 3 1/2 x 5 1/2 89 x 140 4.68
4 x 8 3 1/2 x 7 1/4 89 x 184 6.17
4 x 10 3 1/2 x 9 1/4 89 x 235 7.78
4 x 12 3 1/2 x 11 1/4 89 x 286 9.57
4 x 14 3 1/2 x 13 1/4 89 x 337 11.28
4 x 16 3 1/2 x 15 1/4 89 x 387 12.98
  • 1 lb/ft = 1.48 kg/m
  • 1 in (inch) = 25.4 mm

Weight is based on 35 lb/ft3 actual volume.

  • Rough Lumber - sawn, trimmed and edged - faces are rough with saw marks
  • Surfaced Lumber (dressed) - Rough lumber that has been smoothed on one or more sides and edges by a surfacing machine. 
  • Worked Lumber - Surfaced lumber that has been matched and  patterned

Dry lumber is defined as lumber with less than 19% moisture. Unseasoned or green lumber is lumber with more than 19% moisture.

 

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