Spike's Calculators


International 1/8-inch and 1/4-inch Log Rules Calculators

Spike VM

Grosenbaugh's adaption of Clark's International 1/8-inch and 1/4-inch Log Rules.

Calculate the amount of board feet in a log using the International Log Rule with results for 1/8-inch Kerf and 1/4-inch Kerf.

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 ft
DIB of Log Small End in Inches in


Board Foot International 1/8 Kerf: bf
Board Foot International 1/4 Kerf: bf

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