International 1/4-inch Log Rule (Clark) Calculator

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Calculate the amount of board feet in a log using the International 1/4-inch Log Rule online.

The International 1/8-inch Log Rule was developed by Judson F. Clark in 1906 while working for the Province of Ontario. In 1917 it was modified to allow for a 1/4-inch kerf. The International 1/4-inch Log Rule is considered to be the most accurate mathematical log rule for board feet calculation.


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The first result listed is what the calculator is intended to calculate.

The conversions for the other volume measurements are derived from the first one.

Board Foot * 0.0833333 = Cubic Foot
Board Foot * 0.00235974 = Cubic Meter


Diameter Measured Inside Bark = DIB
Length of Log in Feet 4' Log 8' Log
12' Log
16' Log 20' Log
DIB of Log Small End in Inches in

Results:

All values are rounded to the nearest multiple of 5 board feet and lengths over 20 feet are to be scaled as two or more logs.
Board Feet: bf
Cubic Feet: ft³
Cubic Meter:

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