Timber Measurement & Forestry
Log rules and volume for traders, importers and foresters. Doyle, Scribner and International 1/4-inch are implemented from the published rules — not from a lookup table someone typed out once.
Doyle Log Rule
Scribner Log Rule
International Log Rule
Hoppus Calculator
Smalian Formula
Huber Formula
Log Taper Calculator
Bark Deduction Tool
Sawdust Waste Estimator
Standing Tree Volume
Choosing a log rule
Log rules are not interchangeable, and the differences are large enough to matter commercially. Doyle, Scribner and the International rule were each written to estimate the sawn yield of a log under different assumptions about kerf and taper — and they disagree most on small-diameter logs, where Doyle under-reports substantially.
For trade in India and most of Asia and Europe, Hoppus measure is the relevant one: it measures round volume, deliberately deducting roughly 21% to approximate the squared timber recoverable from a round log. If you are buying on Hoppus and costing on true cubic metres, that gap is your margin.
Smalian and Huber are true geometric volume formulas, not yield rules — use them when you want actual solid content, not an estimate of what a mill will get out. Huber is the more accurate of the two on a taper; Smalian is easier because it only needs the two end diameters.
Bark deduction and taper are the corrections that decide whether any of the above is honest.