Units of Measure

# What is the difference between the Doyle scale and the International scale of measuring logs for lumber?

###### Wiki User

== == Since each of the log rules was developed using different methods with different assumptions, it is logical that they will not always result in the same volumes for given size logs. Table 1 shows a comparison of the three log rules for 16-foot logs ranging in diameter from 6 to 40 inches. Compared to the International Rule, both the Scribner and Doyle Rules underscale logs of smaller diameters. For example, a 12-inch-diameter log contains 95 board feet on the International scale, 80 board feet on the Scribner scale, and 64 board feet on the Doyle scale. Overall, the Doyle Rule will result in lower log volumes than the International Rule, up to a log diameter of 30 inches. Since nearly all logs in Virginia are below 30 inches in diameter, for all practical purposes the Doyle Rule will underestimate the actual board footage. If you are selling stumpage or logs, it is important to recognize the differences in volume associated with the different log rules. Since stumpage or log prices are based on the timber or log volume, you will receive substantially more income with the rules that scale your sizes higher. For example, take a log of 16 inches diameter x 16 feet in length and a value of \$100 per thousand board feet. This log would have the following volumes and values based upon the different log rules: {| ! Log

Diameter

(in.) ! Log Rule ! Volume

(board feet) ! Value (\$) | 16 International 180 18.00 16 Scribner Decimal C 160 16.00 16 Doyle 144 14.40 |}

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