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Below are the commonly accepted lumber dimensions (Nominal vs Actual Dimensions of Lumber)


S4S Hardwood or Softwood Lumber

Nominal Actual
1″ x 2″ 3/4″ x 1-1/2″ 19 x 38 mm
1″ x 3″ 3/4″ x 2-1/2″ 19 x 64 mm
1″ x 4″ 3/4″ x 3-1/2″ 19 x 89 mm
1″ x 5″ 3/4″ x 4-1/2″ 19 x 114 mm
1″ x 6″ 3/4″ x 5-1/2″ 19 x 140 mm
1″ x 7″ 3/4″ x 6-1/4″ 19 x 159 mm
1″ x 8″ 3/4″ x 7-1/4″ 19 x 184 mm
1″ x 10″ 3/4″ x 9-1/4″ 19 x 235 mm
1″ x 12″ 3/4″ x 11-1/4″ 19 x 286 mm
1-1/4″ x 4″ 1″ x 3-1/2″ 25 x 89 mm
1-1/4″ x 6″ 1″ x 5-1/2″ 25 x 140 mm
1-1/4″ x 8″ 1″ x 7-1/4″ 25 x 184 mm
1-1/4″ x 10″ 1″ x 9-1/4″ 25 x 235 mm
1-1/4″ x 12″ 1″ x 11-1/4″ 25 x 286 mm
1-1/2″ x 4″ 1-1/4″ x 3-1/2″ 32 x 89 mm
1-1/2″ x 6″ 1-1/4″ x 5-1/2″ 32 x 140 mm
1-1/2″ x 8″ 1-1/4″ x 7-1/4″ 32 x 184 mm
1-1/2″ x 10″ 1-1/4″ x 9-1/4″ 32 x 235 mm
1-1/2″ x 12″ 1-1/4″ x 11-1/4″ 32 x 286 mm
2″ x 4″ 1-1/2″ x 3-1/2″ 38 x 89 mm
2″ x 6″ 1-1/2″ x 5-1/2″ 38 x 140 mm
2″ x 8″ 1-1/2″ x 7-1/4″ 38 x 184 mm
2″ x 10″ 1-1/2″ x 9-1/4″ 38 x 235 mm
2″ x 12″ 1-1/2″ x 11-1/4″ 38 x 286 mm
3″ x 6″ 2-1/2″ x 5-1/2″ 64 x 140 mm
4″ x 4″ 3-1/2″ x 3-1/2″ 89 x 89 mm
4″ x 6″ 3-1/2″ x 5-1/2″ 89 x 140 mm
 

Plywood

Hardwood veneer plywood is often sized at “full” thickness. ie: 3/4″ = 3/4″
Nominal Actual
1/4″ 15/64″
3/8″ 11/32″
1/2″ 31/64″
5/8″ 19/32″
3/4″ 23/32″

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