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Industry Information Nominal and Actual Lumber Dimensions Table Tue Jul 21 1998 Check this table for actual lumber dimensions. Nominal Size Actual Size Nominal Size Actual Size 1 x 2 ¾ x 1½ 4 x 2 3½ x 3½ 1 x 4 ¾ x 3½ 4 x 6 3½ x 5½ 1 x 6 ¾ x 5½ 4 x 8 3½ x 7¼ 1 x 8 ¾ x 7¼ 4 x 10 3½ x 9¼ 1 x 10 ¾ x 9¼ 4 x 12 3½ x 11¼ 1 x 2 ¾ x 11¼ 6 x 6 5½ x 5½ 2 x 2 1½ x ½ 6 x 8 5½ x 7¼ 2 x 4 1½ x ½ 6 x 10 5½ x 9¼ 2 x 6 1½ x 5½ 6 x 12 5½ x 11¼ 2 x 8 1½ x 7¼   2 x 10 1½ x 9¼ 2 x 12 1½ x 11¼