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

== == 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 |}