b. Arithmetic Method. To determine the number of BF in one or
more pieces of lumber use the following formula:
NOTE: If the unit of measure for length is in inches, divide by 144
instead of 12.
SAMPLE PROBLEM 1: Find the number of BF in a piece of lumber 2 inches
thick, 10 inches wide, and 6 feet long (Figure 121).
SAMPLE PROBLEM 2: Find the number of BF in 10 pieces of lumber 2
inches thick, 10 inches wide, and 6 feet long.
SAMPLE PROBLEM 3: Find the number of BF in a piece of lumber 2 inches
thick, 10 inches wide, and 18 inches long.
EN5155
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