A method of estimating the amount of lumber that can be cut from a saw-log. Also called the Doyle’s, Connecticut River, Scribner’s or Connecticut rule.

Let D be the diameter in inches of the small end of the log, inside the bark, and L the length of the log in feet. Then,

Measure the diameter of the small end of the log, inside the bark, in inches. Subtract 4. Divide by 4. Square the result. Multiply by the length in feet. The result, in board feet, is an estimate of the amount of lumber that can be cut from the log.

To use the calculator below, enter a diameter and length and click anywhere outside the boxes.

Arkansas | “the Doyle stick or standard”, compulsory | Sec. 10481 (1901); Digest of the
Statutes, Crawford & Moses, 1921, ch 113, sec.
6994. |

Florida | “Doyle’s rule and log book”, compulsory | General Statutes, 1920, Div.
1, Title 11, ch. 39. Sec 2384 (1889). |

Louisiana | “'Scribner-Doyle' rule”, compulsory | Statutes, 1920. vol. 3, page
2210. |

Mississippi | “the table known as 'Scribner’s lumber and log book by Doyle's rule'”, compulsory | Hemingway's Ann. Code, 1917,
ch 72, sec. 3355. |

West Virginia | "Doyle and Scribner’s combined rules", optional | Acts, 1919, ch. 53. |

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Last revised: 17 July 2002.