Softwood Lumber  Dimensions
Commercial softwood lumber dimension chart  nominal and actual sizes.
Dimensional lumber is a term used for lumber that is finished  planed and cut  to a standardized width and depth specified in inches.
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 vs mass  the difference
Weight is based on dry wood with 35 lb/ft^{3} (560 kg/m^{3}) 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.
Related Topics

Miscellaneous
Engineering related topics like Beaufort Wind Scale, CEmarking, drawing standards and more.
Related Documents

Angle Calculator  Carpenter's Square
Calculate angles with a straight board across carpenter's square. 
Board Feet Chart and Calculator
Board feet is used as a volume measurement of lumber. 
GlueLaminated Timber  Dimensions
Common sizing of gluelaminated timber. 
Hardwood and Softwood Species
Species of hardwood vs. softwood. 
Hardwood Lumber  Dimensions
Sizing of hardwood lumber. 
Lumber  Surface Finishing
Lumber and surface finishing abbreviations. 
Lumber  Weights
Weights of green, kiln dried and pressure treated lumber boards. 
Machine Stress Rated (MSR) and Machine Evaluated (MEL) Lumber
Grading of lumber in North America 
Miter Saw  Calculate Sawing Angle
Calculate miter saw protractor angles for skirting and decorative mouldings work. 
Softwood Lumber  Grading
Rough lumber, surfaced lumber (dressed), worked lumber, shop and factory lumber and yard lumber. 
Structural Lumber  Section Sizes
Basic size, area, moments of inertia and section modulus for timber  metric units. 
Structural Lumber  Properties
Properties of structural lumber. 
Wood Headers  Max. Supported Weight
Weight supported by a double or triple wood headers.