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The Doyle Log Rule formula to calculate board feet is:
\[ \text{BF} = (d - 4)^2 \left(\frac{L}{16}\right) \]
The Doyle Log Rule is a log scaling method used to estimate the volume of lumber in a log. It is based on the diameter of the log (inside bark) at the small end and the length of the log.
Let's assume the following values:
Using the formula:
\[ \text{BF} = (12 - 4)^2 \left(\frac{16}{16}\right) = 64 \text{ board feet} \]
| Diameter (inches) | Length (feet) | Board Feet |
|---|---|---|
| 6 | 16 | 4.00 |
| 8 | 16 | 16.00 |
| 10 | 16 | 36.00 |
| 12 | 16 | 64.00 |
| 14 | 16 | 100.00 |
| 16 | 16 | 144.00 |
| 18 | 16 | 196.00 |
| 20 | 16 | 256.00 |
| 22 | 16 | 324.00 |
| 24 | 16 | 400.00 |
| 26 | 16 | 484.00 |
| 28 | 16 | 576.00 |
| 30 | 16 | 676.00 |
| Diameter (inches) | Length (feet) | Board Feet |
|---|---|---|
| 20 | 6 | 96.00 |
| 20 | 8 | 128.00 |
| 20 | 10 | 160.00 |
| 20 | 12 | 192.00 |
| 20 | 14 | 224.00 |
| 20 | 16 | 256.00 |
| 20 | 18 | 288.00 |
| 20 | 20 | 320.00 |
| 20 | 22 | 352.00 |
| 20 | 24 | 384.00 |
| 20 | 26 | 416.00 |
| 20 | 28 | 448.00 |
| 20 | 30 | 480.00 |
| 20 | 32 | 512.00 |
| 20 | 34 | 544.00 |
| 20 | 36 | 576.00 |
| 20 | 38 | 608.00 |
| 20 | 40 | 640.00 |
| 20 | 42 | 672.00 |
| 20 | 44 | 704.00 |
| 20 | 46 | 736.00 |
| 20 | 48 | 768.00 |
| 20 | 50 | 800.00 |
| 20 | 52 | 832.00 |
| 20 | 54 | 864.00 |
| 20 | 56 | 896.00 |
| 20 | 58 | 928.00 |
| 20 | 60 | 960.00 |
| 20 | 62 | 992.00 |
| 20 | 64 | 1,024.00 |
