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The formula used to calculate the volume is:

\[ \text{Board Feet} = \frac{(D - 1)^2 \times L}{20} \]

The Roy Log Rule, with results in board feet, was used by mills in Quebec, Canada. The results from this rule are fairly accurate for 14' and 16' logs but over scales slightly on the high end for smaller sized logs.

Steps to calculate the volume:

- Measure the diameter on the small end of the log in inches.
- Enter the length of the log in feet.
- The formula calculates the volume in board feet, cubic feet, and cubic meters.

Let's assume the following values:

- Diameter = 20 inches
- Length = 16 feet

Using the formula:

\[ \text{Board Feet} = \frac{(20 - 1)^2 \times 16}{20} = 288 \]

Diameter (inches) | Length (feet) | Volume |
---|---|---|

6 | 16 | 20.0 |

8 | 16 | 39.2 |

10 | 16 | 64.8 |

12 | 16 | 96.8 |

14 | 16 | 135.2 |

16 | 16 | 180.0 |

18 | 16 | 231.2 |

20 | 16 | 288.8 |

22 | 16 | 352.8 |

24 | 16 | 423.2 |

26 | 16 | 500.0 |

28 | 16 | 583.2 |

30 | 16 | 672.8 |

32 | 16 | 768.8 |

34 | 16 | 871.2 |

36 | 16 | 980.0 |