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The International 1/4" Grosenbaugh Log Rule formula to calculate board feet, as estimated by Grosenbaugh in 1948, is:
\[ \text{BF} = 0.055000LD^2 + 0.006875L^2D - 0.205000LD + 0.00028645833L^3 - 0.201281250L^2 + 0.04666667L \]
The International 1/4" Grosenbaugh 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.
| Diameter (inches) | Length (feet) | Board Feet |
|---|---|---|
| 6 | 16 | 20.00 |
| 8 | 16 | 40.00 |
| 10 | 16 | 65.00 |
| 12 | 16 | 100.00 |
| 14 | 16 | 140.00 |
| 16 | 16 | 185.00 |
| 18 | 16 | 235.00 |
| 20 | 16 | 290.00 |
| 22 | 16 | 355.00 |
| 24 | 16 | 425.00 |
| 26 | 16 | 505.00 |
| 28 | 16 | 585.00 |
| 30 | 16 | 675.00 |
| 32 | 16 | 775.00 |
| 34 | 16 | 875.00 |
| 36 | 16 | 985.00 |
