1. What is a Log Board Foot Calculator?

Definition: This calculator estimates the volume of lumber in board feet based on log diameter and length.

Purpose: It helps forestry professionals, sawmill operators, and woodworkers determine the usable lumber in a log.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: This formula approximates the Doyle Log Rule, a common method for estimating lumber yield from logs.

3. Importance of Board Foot Calculation

Details: Accurate board foot calculations are essential for timber valuation, lumber pricing, and project planning.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What exactly is a board foot?
A: A board foot is a volume measurement equal to 1 foot long × 1 foot wide × 1 inch thick (144 cubic inches).

Q2: Why divide by 20 in the formula?
A: The divisor 20 accounts for saw kerf (waste from cutting) and other factors in the Doyle Log Rule.

Q3: How accurate is this calculation?
A: It's an approximation - actual yield depends on sawing method, log taper, and defects.

Q4: Should I measure diameter at large or small end?
A: Measure at the small end for most accurate results with this formula.

Q5: Are there other log rules?
A: Yes, the Scribner and International rules are alternatives that may give different results.