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Brereton Log Rule Board Foot Calculator

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Formula

The Brereton Log Rule formula to calculate board feet is:

$\text{BF} = 0.06545 D^2 L$

Definition

The Brereton Log Rule calculates the volume of a log in board feet. It does not take into account any deductions needed for saw kerf, slabs, or edgings. It gives the volume of a log in terms of board feet, calculated at one cubic foot = 12 board feet.

Example Calculation

Let's assume the following values:

Average Diameter = 20 inches
Length = 16 feet

Using the formula:

$\text{BF} = 0.06545 \times 20^2 \times 16 = 418.88 \text{ board feet}$

Conversion Chart

Diameter (inches)	Length (feet)	Board Feet
6	16	37.70
8	16	67.02
10	16	104.72
12	16	150.80
14	16	205.25
16	16	268.08
18	16	339.29
20	16	418.88
22	16	506.84
24	16	603.19
26	16	707.91
28	16	821.00
30	16	942.48
32	16	1,072.33
34	16	1,210.56
36	16	1,357.17