# Board Foot Volume of a Tree based on the Scribner Log Rule Approximate the gross board foot volume of a tree using the Scribner Log Rule

The Scribner board foot (fbm) volume is calculated based on the number of 16-foot sawlogs the tree contains in merchantable lumber. The diameter of the tree is measured at breast height (DBH 4½ feet above the ground) The results represent the gross board foot amount as reported in the Scribner Girard form class 78 table.

### How to enter an amount in the "Number of 16 Foot Sawlogs" field of the calculator

The calculation is based on the number of 16-foot sections there are in the tree. The Scribner form class 78 table shows results based on full 16-foot sections and an 8-foot section if needed.
Therefore a 16-foot section is entered as 1
Two 16 foot sections are entered as a 2
The smallest section that can be calculated for is 8 feet, entered as 0.5
a 10-foot tree height is entered as 0.625
a 24-foot tree height is entered as 1.5 (1 for a 16-foot length and 0.5 for the 8-foot length)
a 31-foot tree height is entered as 1.9375 (1 for a 16-foot length and 0.9375 for the 15-foot length)
a 33-foot tree height is entered as 2.0625 (2 for a 32-foot length (2x16') and 0.0625 for the one-foot length)

See table below calculator for decimal values

### Scribner Log Rule

Number of 16 Foot Sawlogs #
Tree Diameter @ Breast Height inch

#### Results:

 Board Foot Volume Scribner bf

#### Calculation

1. the number of 16-foot sawlogs in the tree stem or part thereof (see table)
2. diameter of a tree measured at breast height

#### Result

1. board foot volume of the tree based on the Scribner log scale table for standing tree volumes.
 Tree Height Height in Feet Decimal Value 1' 1/16 of a foot = 0.0625 2' 2/16 of a foot = 0.125 3' 3/16 of a foot = 0.1875 4' 4/16 of a foot = 0.25 5' 5/16 of a foot = 0.3125 6' 6/16 of a foot = 0.375 7' 7/16 of a foot = 0.4375 8' 8/16 of a foot = 0.5 9' 9/16 of a foot = 0.5625 10' 10/16 of a foot = 0.625 11' 11/16 of a foot = 0.6875 12' 12/16 of a foot = 0.75 13' 13/16 of a foot = 0.8125 14' 14/16 of a foot = 0.875 15' 15/16 of a foot = 0.9375 16' 16/16 of a foot = 1 32' 2 48' 3 64' 4 80' 5 96' 6 112' 7 128' 8