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BoardFoot Measure  

Unit of  Volume 
Symbol  FBM 
Unit conversions  
1 FBM in ...  ... is equal to ... 
SI base units  ≈0.002359737 m^{3} 
US Customary  ^{1}⁄_{12} ft^{3} 
BoardFoot Measure  

Unit of  Volume 
Symbol  FBM 
Unit conversions  
1 FBM in ...  ... is equal to ... 
SI base units  ≈0.002359737 m^{3} 
US Customary  ^{1}⁄_{12} ft^{3} 
The boardfoot is a specialized unit of measure for the volume of lumber in the United States and Canada. It is the volume of a onefoot length of a board one foot wide and one inch thick.
Boardfoot can be abbreviated FBM (for "foot, board measure"), BDFT, or BF. Thousand boardfeet can be abbreviated as MFBM, MBFT, or MBF. Similarly, million boardfeet can be abbreviated as MMFBM, MMBFT, or MMBF.
FBM multiples 

fbm= boardfoot 
mfbm=thousand boardfeet 
mmfbm=million boardfeet 
In Australia and New Zealand the term super foot or superficial foot was used to mean the same.^{[1]}^{[2]}^{[3]}
One boardfoot equals:
Board foot is the unit of measure for rough lumber (before drying and planing with no adjustments) or planed/surfaced lumber. An example of planed lumber is softwood 2 × 4 lumber one would buy at a large lumber retailer. The 2 × 4 is actually only 1 ^{1}⁄_{2} in × 3 ^{1}⁄_{2} in (38 mm × 89 mm) but the dimensions for the lumber when purchased wholesale could still be represented as full 2 × 4 lumber, although the "standard" can vary between vendors. This means that nominal lumber includes air space around the physical board when calculating board feet in some situations, while the true measurement of "board feet" should be limited to the actual dimensions of the board.
For planed lumber, boardfeet refer to the nominal thickness and width of lumber, calculated in principle on its size before drying and planing. Actual length is used.
See dimensional lumber for a full discussion of the relationship of actual and nominal dimensions. Briefly, for softwoods, to convert nominal to actual, subtract ^{1}⁄_{4} inch for dimensions under 2 inches (51 mm); subtract ^{1}⁄_{2} inch for dimensions under 8 inches (203 mm); and subtract ^{3}⁄_{4} inch for larger measurements. The system is more complicated for hardwoods.
An Essex table is a tabulation of the number of board feet in lumber of varying dimensions.^{[4]}
