The board-foot is a specialized unit of volume for measuring lumber in the United States and Canada. It is the volume of a one foot length of a board one foot wide and one inch thick.

Board-foot is abbreviated FBM (for "foot, board measure"). The unit MFBM represents a thousand board-feet.

In Australia and New Zealand the term super foot or superficial foot was used to mean the same.[1][2][3]

One board-foot equals:

  • 1 ft × 1 ft × 1 in
  • 12 in × 12 in × 1 in
  • 144 in³
  • 1⁄12 ft³
  • 2360 cm³
  • 2.360 liters
  • 0.002360 cubic meters or steres

Board-feet are used for rough lumber (before drying and planing) with no adjustments.

For planed lumber, board-feet 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 ¼ inch for dimensions under 2 inches (51 mm); subtract ½ inch for dimensions under 8 inches (200 mm); and subtract ¾ inch for larger measurements. The system is more complicated for hardwoods.

References

  1. ^ Rowlett, Russ. "How Many? A Dictionary of Units of Measurement". Retrieved on 2007-01-30.
  2. ^ Burger, Les. "Cutting Timber on Springbrook in 1935". Retrieved on 2007-11-06.
  3. ^ Holgate, Alan. "The Bendigo Monier Arch Bridges.". Retrieved on 2007-11-06.

External links

Retrieved from "http://en.wikipedia.org/wiki/Board_foot"


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