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Conversion Aids

 
All of our rough lumber is sold by the board foot.  

A board foot is a VOLUME measure which contains 144 cubic inches.  1”thick x 12”(1’)wide x 12”(1’)long.

Most project cutting lists or bill of materials are based on SURFACE MEASURE (width x length for a given surfaced thickness).

The following chart is provided as an aid to convert the surface measure to board feet
Conversion from square feet (SF) or square inches (SI) to board feet.
Divide surface measure (SF or SI) by the conversion factor
Example
For 3/4 lumber 10SF divided by 1.33 = 7.5BF
For 3/4 lumber 700SI divided by 192 = 3.6BF

Conversion to Board (BF) Foot from Square foot (SF) or Square inches (SI)
Thickness     BF     CONVERSION FACTOR
Quarter Inch Qty        SF               SI
3/4       0.75  1        1.33           192.00
4/4       1.00  1        1.00           144.00
5/4       1.25  1        0.80           115.20
6/4       1.50  1        0.67             96.00
8/4       2.00  1        0.50             72.00
10/4      2.50  1        0.40             57.60
12/4      3.00  1        0.33             48.00
16/4      4.00  1        0.25             36.00
Additionally, rough lumber thickness is stated in quarters.  A chart is provided below to assist in relating quarter thickness to surfaced (planed) thickness to finished (finish sanded) thickness
Quarter Thickness Inch thickness Surface Plane to: Finished Sanded to:
3/4   3/4    9/16 1/2
4/4     1 13/16  3/4
5/4 scant  1-1/8  15/16 7/8
5/4 1-1/4 1-1/16   
6/4 1-1/2 1-5/16 1-1/4
8/4 2       1-3/4 1-3/4
 
 
 
 
 
 

 

 
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