Green Log and Limb Weight
Green weight and volume of a log or limb from its butt / top diameter, length.
Example
You enter
- Butt (large end) diameter (in) 16
- Top (small end) diameter (in) 16
- Length (ft) 8
- Species (green density) red_oak
You get
- Piece volume 11.17 ft^3
- Green weight (static load) 715
Details, formula, and sources
Green weight and volume of a log or limb from its butt / top diameter, length, and species green density - the static load every rigging number starts from.
volume = (pi/3) x length x (r1^2 + r1 r2 + r2^2) with r = dia/24 (frustum; cylinder when butt = top); weight = volume x green density.
USDA Forest Products Laboratory Wood Handbook green density by species by name; first-principles frustum volume.
The FPL Wood Handbook is free (US government). The frustum volume is public geometry.
Estimate. AHJ and licensed professional govern.
Field names used by the API: butt_dia_in, top_dia_in, length_ft, species, volume_ft3, weight_lb
- Green density FPL green density by species (red oak 64, white pine 36, generic hardwood 58, etc., lb/ft^3)USDA FPL Wood Handbook