A table of values that gives estimated board foot contents for logs of various diameters and lengths. The three log rules most used in the United States are the International 1/4-inch, Scribner, and Doyle. Doyle is the most common log rule in the South and is the legal rule in many southern states.

A table intended to show the amounts of lumber that can be sawed from logs of different sizes under various assumed conditions.

A table showing the estimated or calculated amount of lumber (in board feet) that can be sawn from logs of given length and diameter. 1. Doyle rule. A simple formula used in the eastern and southern U.S. It underestimates the yield from small logs and over estimates with logs over 28 inches in diameter. 2. Doyle-Scribner rule. A combination rule, derived by using Doyle rule values for logs up to 28 inches in diameter and Scribner rule for logs larger than 28 inches. 3. International rule. A formula allowing Y2-inch taper for each 4 feet of length and Vs -inch shrinkage for 1-inch board. In one form, it assumes a V8 -inch kerf; in modified form, it assumes a V4 -inch kerf. 4. Scribner rule. A diagram rule, one of the oldest in existence. It assumes I -inch boards and V4 -inch kerf, makes a liberal allowance for slabs, and disregards taper. Official rule in many parts of the U.S., including the Pacific Northwest. 5. Scribner decimal C rule. The Scribner rule modified by rounding off the last digit to the nearest 10 and dropping the zero'. Zeroes are added to total of volumes. Used in Oregon and Washington.

a method for calculating wood volume in a tree or log by using its diameter and length. The international 1/4-inch rule is the legal rule in Maryland.

a statement, either in the form of a printed table or as marked on a measuring stick, of the estimated board feet of lumber that can be sawed from logs at various lengths and diameters

a table or formula showing estimated volume, in standard units, for various log diameters and lengths

a table showing the estimated net lumber yield in board feet for logs of different diameters and lengths

a tabular system used in determining the net volumetric yield of a log

or LOG SCALE - A timber volume estimation system based on a diagram or mathematical formula used to estimate volume or product yield from logs and trees. Scribner Decimal C is used in California.

A table that expresses log volume based on log diameter and length. The Scribner Decimal C Rule is the legal rule in Idaho.

A measuring formula that gives the relationship between the diameter and length of a log and the board- foot volume of lumber that can be sawn from the log. It is assumed that the entire log is sawn into 1-inch boards. Several rules have been developed, based on varying assumptions about the thickness of the saw and sawing practice used, including Doyle, International Inch, and Scribner Decimal C. Also see “Board foot” and “MBF.

Terms Commonly used in Management Plans] [ Forest Stewardship] A table of the estimated volume or product yield from logs and trees based on a diagram or mathematical formula. Three log rules are commonly used in N.C.; they are the Scribner, Doyle, and International 1/4" rules. Each log rule has specific advantages and limitations. Doyle is the common hardwood log scale. Scribner is the common scale for pine. International best approximates mill output but is used less frequently than the other log scales.