Board feet is often abbreviated bd ft. A board foot is a piece of lumber 1 in. thick by 12 in. long and 12 in. wide or 1 in X 12 in. X 1’ – 0” (or other combinations of dimensions that total 144 cubic inches). Lumber thinner than 1 in. is still calculated at the 1-in. thickness, while lumber over 1 in. thick is calculated in multiples of 1/4 in. up to 2 in. thickness. Another common abbreviation used is RW&L or simple RWL meaning “random width and length”, which applies to selection of the pieces in a lumber order. Ordering specific lengths will mean a slight additional charge for selecting the specified lengths, and one always pays for a full foot of length. Calculating a problem in board feet is a rather simple arithmetic process and should not be mysterious with a bit of practice. The basic formula for calculating the number of board feet is:

No. pieces X width (in.) X thickness (in.) X length (ft.) / 12

Example 1:

10 pcs. – 2 X 4 – 10 ft long / 12

Calculation:

10 X 2 X 4 X 10 = 800

800 / 12 = 66 2/3 bd. ft.

Example 2:

Three pieces of oak are ordered 1 X 8 – 12 ft. long

Calculation:

3 – 1 X 8 – 12 / 12 = 24 bd. ft.

(Note: where 12 appears both above and below the formula line, they can be canceled out and the remaining numbers multiplied.)

Practical retail usage rounds off the fractional portion of a board foot to the nearest whole foot using the standard round-off rules: less than half of a foot, drop it; half or over go up to the next foot.

Lumber thicker than 1 in. is designated by adding quarters to the standard 1 in. Thus lumber measuring 1 1/4 in. thick is called five quarter, 1 1/2 in. thick is known as six quarter, 1 3/4 in. is seven quarter and 2 in. is eight quarter. To calculate the cost of lumber measuring five quarter in thickness, simply calculate the number of board feet using the formula for the 1 in. thickness and then add 1/4 , 1/2 , or 3/4 or more. Thus 6 pieces 5/4 X 8 – 12 ft. long is figured

6 pcs. – 1 X 8 – 12 ft. = 48 / 12

48 X 1/4 = 12

48 + 12 + 60 bd. ft.

Or very simple with a small hand electronic calculator, the problem can easily be entered and figured thus:

Enter 6 X 1.25 X 8 X12 / 12 = 60 bd. ft.

In each case of the extra thickness, substitute the decimal equivalent in the formula:

5/4 = 1.25; 6/4 = 1.50; and 7/4 = 1.75. Of course, a 2-in. thickness is entered directly as 2.

Examples What is the price of 6 pieces of oak measuring 6/4 X 10 in. X 10 ft. long if the price per board foot is $1.95? (this is just hypothetical price)

Solution using the calculator:

Enter 6 X 1.5 X 10 X 10 / 12 = 75 bd. ft.

75 bd. ft X $1.95 = $146.25

Using just a pencil, the calculation would be:

6 X 1 X 10 X 10 / 12

600 / 12 = 50

50 X 1/2 = 25

50 + 25 = 75 bd. ft.

mikepattenson

Fri, 04/03/2015 - 03:57

## price of board per foot

price of board per foot indicated above is just an example. Price may vary depending on the type of wood and supplier's price.

johnmiller789

Sat, 03/26/2016 - 04:15

## It is great to know about

It is great to know about Computation of board feet and price . Why the price vary on the type of wood?

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