Spike's Calculators


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

Spike VM

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


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 ft
DIB of Log Small End in Inches in


Board Feet: bf
Cubic Feet: ft³
Cubic Meters:

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