Compute volume of logs and lumber (GB 4814).
Key formulas: 0.7854×L×(D+0.45×L+0.2)^2÷10000
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Log volume (general) | V = 0.7854 × L × (D + 0.45L + 0.2)² ÷ 10000; diameters graded in 2 cm steps | GB/T 4814-2013 Log Volume Tables |
| Sawn timber volume | V = L × W × T using net scaled dimensions (sub-increment portions not counted) | GB/T 4822-2015 Sawn Timber Inspection |
| Sawn timber conversion | Log-to-sawn yield: softwood 65%–75%, hardwood 55%–70% (depends on mill practice) | Forestry industry practice |
| Seasoned moisture | Furniture/finishing 8%±2%, structural ≤18% (not above local equilibrium MC) | GB/T 6491-2012 Drying Quality of Sawn Timber |
支持原木与板方材两类材积计算:原木采用 GB 4814 国标公式按小头直径与长度计算,板方材按长×宽×厚直接求积,满足木材采购与工程结算需求。