Name: Fred
Who is asking: Other
Level of the question: All

Question: how many 16 foot 2 by 4's are there in a 1000 board feet of lumber.What is the formula for calculating this.



I went to and found the following.

Calculating Board Feet

"Board Feet" is a measurement of lumber volume. A board foot is equal to 144 cubic inches of wood. Actually it's easy to calculate using the following formula:

(Thickness x Width x Length) / 144 = Board Feet

Note: Lumber is specified by its rough size. This is why a 1"x 4" board is actually 3/4" thick and a 2"x 4" board is actually 1-1/2" thick.

When you are figuring up board feet, keep in mind a waste factor. If you purchase good clear material add about 15% for waste, if you elect to use lower grade material you will have to allow for defects and more wasted material -add about 30%. Take a few boards and run the measurements and you will see how easy this works.

One 2 by 4, 16 feet long (that is 12 16 = 192 inches long) is

Length Thickness Width = 192 1.5 3.5 = 1008 cubic inches.

Hence one 16 foot 2 by 4 is

1008/144 = 7 board feet.

Thus to have 100 board feet you would need

1000/7 = 143

2 by 4's