Spike's Calculators


Brereton Log Rule Calculator

Spike VM

Estimate the board foot volume of a log using the Brereton Log Rule.

The Brereton log rule does not take into account any deductions needed for saw kerf, slabs, or edgings and it gives the volume of a log in terms of board feet calculated at one cubic foot = 12 board feet.

Formula used:

BF = 0.06545 * D² * L
D = the average diameter taken from both ends in inches
L = the length of the log in feet

  • Two diameter measurements shall be taken under bark at each log end perpendicular to each other (at both ends) and the final recorded diameter shall be the average of the two measurements.
  • Lengths shall be measured-along a straight line parallel to the central axis of the log and shall be recorded to the nearest lower full odd or even inch.
Diameter Measured Inside Bark = DIB
Average = Small End plus Large End Divided by Two
Length of Log in Feet ft
DIB Average inch


Board Feet: bf
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