Softwood Lumber - Standard Sizes

Nominal and minimum-dressed lumber sizes for boards, dimensional lumber and timber. Provides standard softwood lumber dimensions in both dry and green conditions.

Item Thickness (Nominal)	Dry - Minimum Dressed (in)	Dry - Dressed (in)	Green - Minimum Dressed (in)	Green - Dressed (in)
3/8	5/16	11/32	5/16	11/32
1/2	7/16	15/32	7/16	15/32
5/8	9/16	19/32	9/16	19/32
3/4	5/8	11/16	5/8	11/16
1	3/4	25/32	3/4	25/32
1 1/4	1	1 1/32	1	1 1/32
1 1/2	1 1/4	1 9/32	1 1/4	1 9/32

Nominal Width (in)	Dry - Minimum Dressed (in)	Dry - Dressed (in)	Green - Minimum Dressed (in)	Green - Dressed (in)
2	1 1/2	1 9/16	1 1/2	1 9/16
3	2 1/2	2 9/16	2 1/2	2 9/16
4	3 1/2	3 9/16	3 1/2	3 9/16
5	4 1/2	4 5/8	4 1/2	4 5/8
6	5 1/2	5 5/8	5 1/2	5 5/8
7	6 1/2	6 5/8	6 1/2	6 5/8
8	7 1/4	7 1/2	7 1/4	7 1/2
9	8 1/4	8 1/2	8 1/4	8 1/2
10	9 1/4	9 1/2	9 1/4	9 1/2
11	10 1/4	10 1/2	10 1/4	10 1/2
12	11 1/4	11 1/2	11 1/4	11 1/2
14	13 1/4	13 1/2	13 1/4	13 1/2
16	15 1/4	15 1/2	15 1/4	15 1/2

Item Thickness (Nominal)	Dry - Minimum Dressed (in)	Dry - Dressed (in)	Green - Minimum Dressed (in)	Green - Dressed (in)
2	1 1/2	1 9/16	1 1/2	1 9/16
2 1/2	2	2 1/16	2	2 1/16
3	2 1/2	2 9/16	2 1/2	2 9/16
3 1/2	3	3 1/16	3	3 1/16
4	3 1/2	3 9/16	3 1/2	3 9/16
4 1/2	4	4 1/16	4	4 1/16

Nominal Width (in)	Dry - Minimum Dressed (in)	Dry - Dressed (in)	Green - Minimum Dressed (in)	Green - Dressed (in)
2	1 1/2	1 9/16	1 1/2	1 9/16
3	2 1/2	2 9/16	2 1/2	2 9/16
4	3 1/2	3 9/16	3 1/2	3 9/16
6	5 1/2	5 5/8	5 1/2	5 5/8
8	7 1/4	7 1/2	7 1/4	7 1/2
10	9 1/4	9 1/2	9 1/4	9 1/2
12	11 1/4	11 1/2	11 1/4	11 1/2
14	13 1/4	13 1/2	13 1/4	13 1/2
16	15 1/4	15 1/2	15 1/4	15 1/2

Thickness Category (Nominal)	Thickness Allowance (in)	Width Category (Nominal)	Width Allowance (in)
5 & 6 thick	1/2 off	5 & 6 wide	1/2 off
7 - 15 thick	3/4 off	7 - 15 wide	3/4 off
>= 16 thick	1 off	>= 16 wide	1 off

Unit Conversion: 1 inch (in) = 25.4 mm