Log Volume Calculator (Huber, Smalian, Newton)
Estimate the cubic volume of a log with Huber, Smalian or Newton — free.
Measure one, two or three diameters plus the length; the calculator returns the log volume in cubic metres and cubic feet for each classical formula so you can compare estimates on the same log.
FAQ
Which method should I use?
Huber needs only the mid-length diameter, so it is the quickest in the field. Smalian needs both end diameters, and Newton needs all three measurements and is the most accurate of the classical formulas.
Why do the three formulas give different volumes?
On a tapering log, squaring the diameters makes the averages differ: Smalian (ends only) returns the highest estimate, Huber (middle only) the lowest, and Newton sits in between — Smalian ≥ Newton ≥ Huber.
Should I measure over or under bark?
Measure the diameter under bark where possible. If you only have the over-bark girth, deduct double the bark thickness (roughly 2–4 cm per diameter) or use a species-specific bark factor.