Convert common nominal lumber sizes to actual dimensions, compare inches and metric sizes, and estimate board feet from board length and quantity.
2 × 4 actual size:
1.5 in × 3.5 in
2 × 6 actual size:
1.5 in × 5.5 in
2 × 8 actual size:
1.5 in × 7.25 in
4 × 4 actual size:
3.5 in × 3.5 in
Lumber size conversions are useful for framing, decks, sheds, posts, blocking, trim work, woodworking, rough material planning, and construction estimates.
Use this converter when comparing nominal board names, actual board dimensions, metric measurements, and board foot estimates.
Your result shows the actual lumber thickness and width for the selected nominal size. It also shows the board length, quantity, estimated board feet, and metric dimensions.
For material estimating, remember that actual lumber dimensions can vary slightly by product, manufacturer, moisture content, and surfaced or rough-sawn condition.
A 2 × 4 is a nominal size. After drying and surfacing, the finished board is usually about 1.5 inches by 3.5 inches.
A standard 2 × 6 is usually 1.5 inches thick by 5.5 inches wide.
A standard 4 × 4 is usually 3.5 inches by 3.5 inches.
Board feet are calculated as thickness in inches multiplied by width in inches multiplied by length in feet, divided by 12.
No. This converter focuses on nominal and actual lumber size. A board feet converter focuses mainly on lumber volume unit conversions.