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Common Lumber Dimensions

Nominal vs. Actual Lumber Dimensions

Lumber sizes are usually given in "nominal" measurements. The nominal measurements are a board's size before it has been planed smooth (surfaced) on all 4 sides. The actual measurements are the final size. Actual sizes may vary slightly due to the moisture content.

Nominal Size Actual Size Nominal Size Actual Size Nominal Size Actual Size
1x2 3/4" x 1-1/2" 2x2 1-1/2" x 1-1/2" 4x4 3-1/2" x 3-1/2"
1x3 3/4" x 2-1/2" 2x3 1-1/2" x 2-1/2" 4x6 3-1/2" x 5-1/2"
1x4 3/4" x 3-1/2" 2x4 1-1/2" x 3-1/2" 6x6 5-1/2" x 5-1/2"
1x5 3/4" x 4-1/2" 2x6 1-1/2" x 5-1/2" 5/4x6 1" x 5-1/2"
1x6 3/4" x 5-1/2" 2x8 1-1/2" x 7-1/4" 8x8 7-1/4" x 7-1/4"
1x8 3/4" x 7-1/4" 2x10 1-1/2" x 9-1/4"
1x10 3/4" x 9-1/4" 2x12 1-1/2" x 11-1/4"
1x12 3/4" x 11-1/4"