1. What is a Log to Board Foot Calculator?

Definition: This calculator estimates the board feet of lumber that can be obtained from a log based on its diameter and length.

Purpose: It helps lumber professionals, woodworkers, and foresters estimate the usable lumber volume from logs.

2. How Does the Calculator Work?

The calculator uses the Doyle Log Rule formula:

Where:

• \( BF \) — Board feet of lumber
• \( D \) — Log diameter (inches) at small end
• \( L \) — Log length (feet)

Explanation: The formula accounts for the loss during milling by subtracting 4 inches from the diameter before calculation.

3. Importance of Board Foot Calculation

Details: Accurate board foot estimation helps in pricing logs, planning lumber production, and managing timber resources efficiently.

4. Using the Calculator

Tips: Measure the log diameter at the small end (in inches) and the log length (in feet). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why subtract 4 inches from the diameter?
A: This accounts for slab loss when squaring the log and kerf loss from the saw blade during milling.

Q2: How accurate is this calculation?
A: The Doyle rule tends to underestimate volume for small logs and overestimate for large logs. It's most accurate for logs 28-38 inches in diameter.

Q3: Are there other log rules?
A: Yes, common alternatives include the Scribner and International 1/4" rules, each with different formulas.

Q4: Does this account for defects?
A: No, the calculation assumes a perfect log. Deductions should be made for rot, knots, or other defects.

Q5: What's considered a board foot?
A: One board foot equals 144 cubic inches of wood (12" × 12" × 1").