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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.

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
Nominal Size (in x in)	(in x in)	(mm x mm)	Weight (lb/ft) Load Calculator!
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/ft³ (560 kg/m³) 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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Related Topics

Miscellaneous - Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more.

Related Documents

Board Feet Chart and Calculator - Board feet is used as a volume measurement of lumber.
Glue-Laminated Timber - Dimensions - Common sizing of glue-laminated 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
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.

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