Board foot

A thousand board feet can be abbreviated as MFBM, MBFT, or MBF.

Similarly, a million board feet can be abbreviated as MMFBM, MMBFT, or MMBF.

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.

For planed lumber, board feet refer to the nominal thickness and width of lumber, calculated in principle on its size before drying and planing.

Note: see dimensional lumber for a full discussion of the relationship of actual and nominal dimensions.