Calculate Board Footage in a Log

How to Calculate Board Footage in a Log

Tools Required for Calculation

To begin calculating board footage in logs, ensure you have a pencil and paper handy. These tools are essential for noting measurements and calculations during the process.

Measuring Log Diameter and Length

Start by measuring the log's diameter at the smaller end inside the bark, noting this measurement in inches. Then, measure the log's total length in feet. These dimensions are critical as they form the basis for using the Doyle Log Scale, a preferred method among log buyers for its conservative estimates.

Using the Doyle Log Scale

With the diameter and length noted, consult the Doyle Log Scale. Find the row matching the log's diameter and move horizontally along that row to align with the column that corresponds to the log's length. The intersection of these measurements indicates the board footage. Board Footage = Diameter(in) x Length(ft)

Adjusting for Defects

After initial calculations, inspect the log for any defects such as rot or curves. Deduct the estimated loss of usable wood due to these defects to arrive at the final board footage estimate.

Checking for Metal Contaminants

To avoid potential damage to cutting equipment, inspect the log for signs of metal by examining for stains and bumps under the bark. Logs found near fence lines might also contain metal, influencing both the handling process and the value of the log.

Accurate board footage calculations help in evaluating the worth and usable material of each log, guiding harvesting and purchasing decisions effectively.

Calculating Board Footage in Logs

Understanding Board Footage

Board footage measures the volume of lumber in a log and is crucial for timber management and sales. Utilize common methods like the Doyle Rule to ensure accuracy and adherence to industry standards.

Using the Doyle Rule

The Doyle Rule is a widely accepted method for estimating board feet, particularly in locales like St. Louis. Although not 100% accurate, its common acceptance makes it a practical choice for many professionals.

Steps to Calculate Board Footage

To accurately determine board footage using the Doyle Rule, follow these essential steps:

1. Measure the average diameter of the log's small end inside the bark, using inches as the unit. This measurement is denoted as D.

2. Measure the length of the log in feet, represented as L.

3. Apply the Doyle formula: Board Footage (Doyle) = (((D - 4) / 4)^2) * L.

4. Consult the Doyle Log Scale chart by locating the row that corresponds to your diameter measurement, then move horizontally to intersect with the log's length, which yields the board footage.

Accounting for Imperfections

Account for any defects in the log, such as rot or unnatural curves, by making necessary deductions from the total calculated board footage. This adjustment ensures you estimate the usable wood more accurately.

Remember, for reliable results, repeat the process for each log and use consistent tools and methods to measure dimensions.

Calculating Board Footage in Logs

Example 1: Cylinder Formula for a Single Log

To calculate the board footage for a standard log, use the cylinder formula. Start by measuring the diameter (D) and the length (L) of the log in inches. Calculate the radius (r = D/2), then use Board Feet = (π * r^2 * L) / 144 where π (pi) appromiates to 3.14159.

Example 2: Using the Doyle Log Scale

The Doyle Log Scale, a conventional method in the timber industry, requires the log’s diameter at the smaller end (D) and the length (L). Use the scale to find the corresponding board footage directly from a table. This method tends to underestimate small logs, but remains popular.

Example 3: The Huber Formula

For logs with uniform diameter ends, apply the Huber Formula by measuring the diameter at both ends, averaging them (d = (D1 + D2) / 2), and then calculating the radius (r = d / 2). Calculate board footage using Board Feet = (π * r^2 * L) / 144.

Example 4: Scribner Decimal C Log Rule

An alternative volumetric estimation, the Scribner Rule, involves measuring the mid-diameter and length of the log. Refer to the Scribner rule charts to translate these measurements directly into board footage, accommodating taper and defect deductions automatically.

Example 5: Direct Volume Calculation for Irregular Logs

In cases where the log is irregular, compute each section’s volume individually using the cylinder formula. Then add these volumes to get total board footage. Use Volume = (π * r^2 * segment_length) / 144 for each segment.

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