Part of architecture is determining the board feet of lumber. Cabinet grade grade lumber is sold by the board foot and can become quite expensive. Cabinet lumber is sold by 3/4, 4/4, 5/4, 6/4 and so on. A Board foot is 144 cubic inches or 12" x 12" x “1 or any combination of the three. Lengths are usually given in feet and the feet must be turned into inches. For example a piece of wood is 5" wide, 5 inches thick and 13 feet is 13 x 12 or 156. Go 5 x 5 x 156 then divide by 144. The answer is 27.083333 Board ft. or round up to next Board ft. 28. Look up Groff and Groff lumber price list and find the price for the following domestic lumber per Board ft.: 1. Cherry 4/4 Common $2.65 5 Board Ft cost_ 2. Walnut 6/4 FAS $12.75 20 Board Ft. cost_ 3. Red Oak 5/4 FAS $4.55 35 Board Ft. cost Look up prices for exotic lumber per Board ft. 4. Zebra Wood 4/4 $20.00 8 Board ft. cost 5. Ebony Massacar 4/4 $66.00 3 Board ft. cost Framing lumber for buildings is usually listed by the width, thickness, and length of the board. The numbers shown for the problems are nominal sizes for the lumber. Here are the actual sizes for framing lumber: 2 x 4 is 1 1/12 x 3 ½, 2 x 6 is 1 ½ x 5 ½, 2 x 8 is 1 ½ x 7, 2 x 10 is 1 ½ x 9½ and 2 x 12 is 1 ½ by 11 . When determining Board ft., use the nominal sizes. 1. 2 X 2 X 18 2. 4X4 X 12 3. 2 X2 X 16 4. 4 X 8 X 16 5. 7 X 8 X 20 6. 1 X 1 X 20 7. 3 X4 X 16 8. 2 X 10 X 16 9. 2X8X12 10. 4 X 4 X16