The Doyle Scale Calculator is a specialized tool designed to estimate the volume of lumber in logs before they are milled. By inputting specific measurements of a log, users can determine the number of board feet the log contains. A board foot, the standard measure for lumber in the United States, corresponds to a volume of 144 cubic inches, equivalent to a piece of wood one foot long, one foot wide, and one inch thick.
Formula of Doyle Scale Calculator
Board Feet = (Diameter in inches - 4)^2 / 16 x Length in feet
Understanding the Formula Components
- Diameter in inches: Measures the small end of the log, inside the bark, which is crucial for calculating the usable wood volume.
- 4: Deducted to account for the saw kerf and waste, ensuring the estimate reflects the actual usable lumber.
- Squared: The difference (diameter – 4) multiplied by itself, adjusting for the log’s taper and shape.
- 16: A constant that standardizes the calculation to board feet, reflecting the dimensions of a board foot.
- Length in feet: The log’s length, integral to determining the total volume.
Practical Applications and Conversion Table
| Diameter at Small End (inches) | Length (feet) | Estimated Board Feet |
|---|---|---|
| 10 | 8 | 40 |
| 12 | 8 | 60 |
| 14 | 8 | 80 |
| 16 | 8 | 100 |
| 18 | 8 | 130 |
| 20 | 8 | 160 |
| 22 | 8 | 190 |
| 24 | 8 | 230 |
| 26 | 8 | 270 |
| 28 | 8 | 310 |
| 30 | 8 | 360 |
Notes:
- Diameter at Small End: This is measured in inches at the smallest diameter of the log, inside the bark.
- Length: The log length is measured in feet.
- Estimated Board Feet: This column provides an estimation of the lumber volume contained within the log according to the Doyle Scale, facilitating quick assessments without detailed calculations.
Example of Doyle Scale Calculator
Consider a log with a diameter of 14 inches and a length of 10 feet. Using the Doyle Scale formula, the volume of the log in board feet can be easily calculate, providing a straightforward measure of the log’s lumber potential.
Most Common FAQs
The Doyle Scale is widely recognize for its practical accuracy, particularly in estimating the volume of medium to large logs. It is important to note, however, that it may overestimate the volume of small logs.
The Doyle Scale, Scribner Scale, and International 1/4-Inch Scale are the most commonly use log scaling rules. The Doyle Scale is favor for its simplicity and efficiency, although it might yield lower estimates for small logs compared to the Scribner and International rules.
While the Doyle Scale Calculator is versatile, it is best suit for hardwood logs. For softwood or logs intended for specific purposes like veneer or pulp, other scaling methods might be more appropriate.