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The International 1/8" Grosenbaugh Log Rule formula to calculate board feet, as estimated by Grosenbaugh in 1948, is:
\[ \text{BF} = 0.04976191LD^2 + 0.006220239L^2D - 0.1854762LD + 0.000259176L^3 - 0.01159226L^2 + 0.04222222L \]
The International 1/8'' 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 | 25.00 |
| 8 | 16 | 45.00 |
| 10 | 16 | 75.00 |
| 12 | 16 | 110.00 |
| 14 | 16 | 150.00 |
| 16 | 16 | 200.00 |
| 18 | 16 | 260.00 |
| 20 | 16 | 325.00 |
| 22 | 16 | 395.00 |
| 24 | 16 | 470.00 |
| 26 | 16 | 555.00 |
| 28 | 16 | 650.00 |
| 30 | 16 | 750.00 |
| 32 | 16 | 855.00 |
| 34 | 16 | 965.00 |
| 36 | 16 | 1,085.00 |
