Respect the Tree: Where a Log Goes, and What Waste Really Costs
Decades to grow. Minutes to waste.
A sawlog is years of growth. This guide puts numbers on that: how long a log took to grow, how much of it ends up as lumber, and what every board you save keeps standing.
A sawlog is decades of growth. Under 55% of a hardwood log's volume ends up as lumber. Every board you get out of it keeps its carbon stored and means fewer trees cut for the same lumber.
It took decades to grow
| How long | What it takes |
|---|---|
| 22–35 years | to grow a loblolly pine to final harvest in Georgia |
| About 80 years | to grow a red oak to a 16-inch log, at about 0.2 inch of diameter a year |
| 40,000 gallons | of water a large oak moves in a single year |
A sawlog is decades of sunlight, rain and growth. Wasting the log wastes all of that.
What every ounce cost the tree
Take a 16-inch, 8-foot log as a simple cylinder: 11.2 cubic feet. At Wood Handbook weights for dried wood (12% moisture):
| Species | Dry wood in the log | Years to grow | Growth per ounce |
|---|---|---|---|
| Red oak (39 lb/ft³) | About 436 lb (6,970 oz) | 80 | 4.2 days |
| Loblolly pine (32 lb/ft³) | About 357 lb (5,720 oz) | 30 | 1.9 days |
One red oak 1×6×8 board (3/4 × 5-1/2 inches × 8 feet) weighs about 9 lb dry: about 1.6 years of the tree's growth. Every ounce on the slab pile is days of the tree's life.
Lumber is a carbon store
Dry wood is about 50% carbon by weight, and each pound of carbon corresponds to 3.667 lb of CO₂ taken from the air.
- About 800 lb of CO₂ is held in the dry wood of one 16-inch × 8-foot red oak log.
- 16 lb of CO₂ is locked in one oak 1×6×8 board, for as long as the board lasts.
Why it matters at the mill
- Stored, not released. Lumber in a barn, a floor or a table holds its carbon for decades.
- Sawn close to home. A portable mill cuts near where the tree grew.
- Less to burn or rot. Slabs and sawdust give their carbon back far sooner.
- Fewer trees for the same lumber. More boards per log means less cutting.
Where a hardwood log goes
A USDA Forest Service study of hardwood sawlogs found:
| Where it goes | Share of the log's volume |
|---|---|
| Lumber | Under 55% |
| Edgings and trim | 17% |
| Sawdust | 16% |
| Slabs | 12% |
Small logs lose more to slabs.
Thin kerf already helps. A band mill's kerf of about 3/32 inch, against about 1/4 inch for a circle saw, can mean up to 20% more lumber.
LogMaster does the rest. It plans every cut for your mill, for the log in front of you, so more of the tree can land on the lumber pile and less on the slab pile. LogMaster gives estimates; it is not a certified scaling instrument.
Sources
- Loblolly rotations: UGA Warnell School of Forestry, Dickens et al. 2012 (WSFNR-12-FP-8); Clemson Extension.
- Red oak growth: USDA Forest Service, Silvics of North America (northern red oak); Mississippi State Extension P3463 (80-year upland hardwood rotations).
- Water: USGS Water Science School, Evapotranspiration and the Water Cycle.
- Wood weights: USDA Forest Products Laboratory, Wood Handbook, Table 4-3b; Penn State Extension, Calculating the Green Weight of Wood Species.
- Carbon: Penn State Extension, Conversions Commonly Used When Comparing Timber and Carbon Values.
- Log breakdown: USDA Forest Service, Kline et al. 1993 (Treesearch 306).
- Kerf: Alberta Agriculture, portable sawmill guidance.
- Method: per-ounce and carbon figures are averaged estimates for a 16-inch × 8-foot log treated as a cylinder, at 12% moisture.
Where to go next
To see LogMaster's price next to everything else at the mill, read What LogMaster Costs. For the payback math, see Is a Portable Sawmill Worth It?. To find the board feet in a log of your own, use the log scale calculator. Standing at your first log? Start with Your First Log: Deciding What to Cut.