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Ontario Log Rule

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The Ontario Log Rule is a method used in the forest industry to measure the volume of a log in board feet. It applies to logs with diameters from 4" to 40" (measured small end, inside bark) and lengths of the log from 8' to 18'.

Board feet = (0.55D² - 1.2D) * L ÷ 12
D = diameter small end inside bark in inches
L = length of log measured in feet

Log lengths are measured in full feet.
Small end diameters of the log are measured inside the bark and recorded in one-inch diameter classes and rounded off to the nearest inch

Ontario Log Rule

Length of Log in Feet ft
DIB of Log Small End in Inches in

Results:

Board Foot fbm

Calculation

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

Result

  1. board foot of the log (fbm)


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