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To estimate tree volume in board feet, determine the tree diameter at 4 1/2 feet above ground (referred to as Diameter at Breast Height or DBH) and the usable length of the first log (the distance between the stump and the first large branches).

To measure the diameter, either use a tree scale stick (instructions for use are here) or a diameter tape measure which can be found in some hardware stores.

( NOTE: In Illinois, the State Administrative Code Section 1585 specifies that the Doyle Log Rule will apply, as opposed to the International or Scribner Log Rules that are used in some other states.)


The table below shows the size of the first log in board feet, 1 board foot =  12” x 12” x 1”.

 



12


14


16


18


20


22


24


26


28


30


32


34


36


38


40


42

8’


20


30


40


60


80


100


130


160


190


230


270


300


350


390


430


470

16’


30


50


70


100


130


170


220


260


320


380


440


510


580


660


740


830

24’


40


70


100


130


180


230


290


360


430


510


590


680


780


880


990


1100

32’


50


80


120


160


220


280


360


440


520


630


730


850


970


1100


1230


1370

40’


60


90


140


200


260


340


430


520


620


740


860


1000


1140


1290


1450


1620

48’


-


100


160


220


300


380


490


590


710


840


990


1140


1310


1480


1660


1860

56’


-


-


180


240


320


420


540


660


800


940


1120


1300


1480


1680


1880


2100

64’


-


-


190


260


360


460


600


740


880


1040


1220


1440


1640


1860


2080


2320

--------- Usable Length of First Log ----------

Doyle Log Rule Tree Scale