Ontario Log Rule Board Foot Calculator

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Formula

The formula used to calculate the volume is:

\[ \text{Board Feet} = \frac{(0.55D^2 - 1.2D) \times L}{12} \]

Definition

The Ontario Log Rule is a method used in the forest industry to measure the volume of a log in board feet. It applies to logs with diameters from 4" to 40" (measured small end, inside bark) and lengths of the log from 8' to 18'.

Steps to calculate the volume:

Measure the diameter on the small end of the log in inches.
Enter the length of the log in feet.
The formula calculates the volume in board feet, cubic feet, and cubic meters.

Example Calculation

Let's assume the following values:

Diameter = 20 inches
Length = 16 feet

Using the formula:

\[ \text{Board Feet} = \frac{(0.55 \times 20^2 - 1.2 \times 20) \times 16}{12} = 224 \]

Conversion Chart

Diameter (inches)	Length (feet)	Volume
6	16	16.8
8	16	34.1
10	16	57.3
12	16	86.4
14	16	121.3
16	16	162.1
18	16	208.8
20	16	261.3
22	16	319.7
24	16	384.0
26	16	454.1
28	16	530.1
30	16	612.0
32	16	699.7
34	16	793.3
36	16	892.8