Spike's Calculators


Doyle Log Rule Calculator

Spike VM Doyle Log Rule Calculator

Estimate the number of board feet you can recover from a log using the Doyle log rule.

The Doyle rule estimates lumber recovery, the number of board feet, based on log diameter, length, residue, and saw kerf.

It is said that it underestimates the volume for logs with diameters under 28 inches.

Length of Log in Feet ft
DIB Log Small End in Inches inch
Diameter Measured Inside Bark = DIB


Board Feet: bf


  1. enter the length of the log in feet
  2. the diameter of the log measured on the small end inside bark in inches


  1. the amount of board feet
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