FBM, Foot Board Measure, Lumber, Board

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FBM

FBM Calculation

1 fbm (foot board measure) is equal to a board 12" wide x 12" long x 1" thick
Fbm is calculated as thickness (inches) x width (inches) x length (feet) / 12
Thickness and width used in the fbm calculation are nominal (2x4, 2x6) although the finished size is 1.500 x 3.500, 1.500 x 5.500, etc.
A 2x4x8' would equal 5.33 fbm