Log Weight Calculator
Get accurate weight estimates for logs based on species, size, and moisture content. Includes Doyle board foot estimation for rough lumber yield.
Diameter at the narrowest end of the log
How is log weight calculated?
Log weight is calculated by multiplying the log volume by the wood density for the specific species at a given moisture level. Volume is estimated from the small-end diameter and length using the cylinder formula (πr²h), which provides a reasonable approximation for logs. The Doyle log rule is also provided for board foot estimation common in the lumber industry.
How does moisture affect log weight?
Green (freshly cut) logs contain significant water weight, often 40-50% of total weight. As wood dries, it loses this water mass. Seasoned wood typically has 20% moisture content and weighs about 22% less than green wood. Kiln dried wood can be 32% lighter than green. The calculator adjusts density based on moisture condition to provide realistic weight estimates.
Why use the small-end diameter rather than the middle?
The small-end diameter gives a conservative volume estimate that accounts for natural log taper. This is the standard practice in the forestry industry for estimating useful lumber volume. Using the mid-point diameter would overestimate since logs taper from base to top. The Doyle scale is one of several log rules (including Scribner and International) used in North America.
How much does a typical log weigh?
A green oak log 12 inches in diameter and 8 feet long weighs approximately 550-600 pounds. A 10-foot maple log of similar diameter weighs about 450 pounds. Pine logs are lighter at roughly 350-400 pounds for the same size. A large 24-inch diameter by 16-foot green oak log can weigh over 3,000 pounds — requiring heavy equipment to move.