1. What is the Scribner Scale?

The Scribner Scale is a logarithmic formula used to estimate the volume of lumber in board feet from log measurements. It's one of the most commonly used methods in the forestry industry for log scaling.

2. How Does the Calculator Work?

The calculator uses the Scribner Scale formula:

Where:

• \( BF \) — Board feet
• \( D \) — Diameter of log in inches (inside bark at small end)
• \( L \) — Length of log in feet

Explanation: The formula accounts for the taper of logs and waste in lumber production, providing a practical estimate of usable lumber.

3. Importance of Board Feet Calculation

Details: Accurate board feet calculation is crucial for timber valuation, forest management, and fair transactions between loggers and mills.

4. Using the Calculator

Tips: Enter diameter in inches (measured at small end inside bark) and length in feet. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How does Scribner compare to other log rules?
A: Scribner tends to underestimate volume compared to Doyle but is more accurate than Doyle for larger logs. It's less precise than International 1/4" rule.

Q2: What are typical board feet values?
A: A 10-inch diameter, 16-foot log yields about 50-60 board feet. Values increase exponentially with diameter.

Q3: When is Scribner scale most appropriate?
A: Best for softwoods in western US, especially when logs will be processed at sawmills using Scribner scaling.

Q4: What are limitations of this formula?
A: Doesn't account for log quality, species differences, or taper variation. Less accurate for very small or very large logs.

Q5: How is diameter measured?
A: Diameter should be measured inside bark at the small end of the log, rounded to nearest inch.