Spike's Calculators


International 1/8-inch Kerf Log Rule Calculator

Spike VM

Calculate the amount of board feet in a log using the the International 1/8-inch Log Rule.

The International 1/8-inch Log Rule was developed by Judson F. Clark in 1906 while working for the Province of Ontario.

The first result listed is what the calculator is intended to calculate. Board feet results are rounded to the nearest 5

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


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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