Spike's Calculators


Volume of Standing Trees Using the Doyle Log Scale

Spike VM

Approximate the board foot volume of a tree using the Doyle log scale.
Board foot value results are for Girard form class 78, the most commonly used class.

Instead of using "merchantable height" in 16-foot logs this calculator uses the merchantable height of the tree from a one-foot stump height to where main stem diameter equals a specified limit. The diameter measured @ breast height (4.5 feet) in inches.

Doyle Log Rule for Standing Tree

Merchantable Tree Height ft
Tree Diameter @ Breast Height inch


Board Foot Volume Doyle bf


  1. enter the merchantable height of a tree in feet
  2. tree diameter measured at breast height in inches


  1. board foot volume of the tree as reported in Girard form class 78
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