How it's calculated
value = (Doyle board feet ÷ 1,000) × price per MBF × grade factor
Doyle board feet per 16-ft log = (d − 4)², d = log small-end diameter (in), summed over the logs; MBF = board feet ÷ 1,000; price per MBF set by species; grade factor 0.3–1.4. Delivered-log value ≈ 2.1 × stumpage.
Common questions
What is the Doyle log rule?
It is a common US formula for estimating board feet in a log from its small-end diameter and length. It tends to underestimate volume on smaller logs.
What is stumpage value?
Stumpage is what a buyer pays for the standing timber before it is cut, which is lower than the delivered value at the mill.