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This is a Quantitative Study study.

September 20, 2025

A Defense of the Doyle Log Rule in New Jersey

Key Points

The Doyle rule, when applied correctly, yields satisfactory results for scaling hardwood logs in New Jersey.
An analysis of 154 logs indicates that the Doyle method often provides slightly higher board-foot estimates than the International ¼-inch rule.
Technical guidance from the state forester is crucial for accurate stumpage sales under the Doyle rule.
Scaling hardwood logs with an average diameter of 17.4 inches demonstrates the applicability of the Doyle method.

Abstract

Abstract In New Jersey the Doyle rule is applied by taking the diameter at the middle of the log inside bark and rounding off fractions of an inch to the nearest inch. With 154 hardwood logs averaging 17.4 inches in middle diameter and 30 feet in length, this method of scaling, which is the one prescribed in Scribner's Lumber and Log Book, gave board-foot contents slightly in excess of those given by the International ¼-inch rule. The author believes that the Doyle rule gives satisfactory results when properly applied under the conditions which prevail in New Jersey and where sellers of stumpage have access to technical guidance from the state forester.

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