'Board Foot' is equal to 1 inch Thick x 12 inches Wide x 12 inches Long.
The shorthand for board feet is BdFt

Here is the formula to figure out board feet:
Thickness x Width x Length ÷ 144 = ? board feet
or
T x W x L ÷144 = ? board feet

Example:
1" Thick x 12" Wide x 12”Long ÷144 = 1 board foot
or
1 x 12 x 12 ÷ 144 = 1 board foot

Example:
1 x 12 x 96 ÷ 144 = 8 board feet

Example:
2 x 12 x 96 ÷ 144 = 16 board feet

MOST BOARDS DO NOT COME 12 INCHES WIDE BUT THE CALCULATION IS THE SAME:

Example:
1 x 8 x 120" ÷ 144 = 6.67 Board Feet