Lumber Dimensions (for real!)

There is often a great deal of confusion around this issue. Most people, if you told them to get a 2×4 piece of lumber would assume it measures 2 inches by 4 inches. BUT WAIT! It does not. It measures 1-1/2″ x 3-1/2″. This is VERY important when you are designing your project and dimension the plan.

Below are many of the more common dimensions.

Stated Actual – Standard Actual – Metric
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
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