1. What is the Doyle Log Rule?

The Doyle Log Rule is a method for estimating the board foot volume of logs based on diameter and length. It's commonly used in the eastern United States for standing tree volume estimation.

2. How Does the Calculator Work?

The calculator uses the Doyle rule formula:

Where:

• \( D \) — Diameter at breast height (inches)
• \( H \) — Merchantable height (feet)

Explanation: The formula approximates the number of board feet of lumber that can be sawn from a log of given dimensions.

3. Importance of Log Volume Calculation

Details: Accurate volume estimation is crucial for timber valuation, forest management, and logging operations planning.

4. Using the Calculator

Tips: Enter diameter in inches (measured at breast height, 4.5 feet above ground) and height in feet. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the Doyle rule?
A: The Doyle rule tends to underestimate volume for small logs and overestimate for large logs compared to actual mill yields.

Q2: What are other common log rules?
A: Other rules include Scribner, International 1/4", and cubic volume rules. Each has different applications and regional preferences.

Q3: How should diameter be measured?
A: Diameter should be measured at breast height (DBH, 4.5 feet above ground) using a diameter tape or calipers.

Q4: What is merchantable height?
A: Merchantable height is the usable length of the tree trunk, typically from stump height to a minimum top diameter.

Q5: Does this account for taper?
A: The Doyle rule incorporates an average taper assumption. For precise measurements, more complex formulas may be needed.