Eco Impact Calculator
See exactly how much good your reclaimed lumber choice does for the planet. Enter your project details below and watch the numbers add up.
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Calculate Your Impact
Enter the amount of lumber you plan to recycle or purchase as reclaimed, and see the positive environmental impact in real time.
How it works: Every board foot of reclaimed wood you use instead of new lumber saves trees, reduces carbon emissions, conserves water, diverts waste from landfills, and cuts manufacturing energy.
Your Environmental Impact
Our Methodology
The calculations above are based on industry-accepted averages from the U.S. Forest Service, the Environmental Protection Agency, and lifecycle analysis data from the National Renewable Energy Laboratory. Here is how each metric is derived:
- Trees saved: One average tree yields approximately 200 board feet of lumber. Each board foot of reclaimed wood you use is one less board foot that needs to be harvested.
- CO₂ offset: Manufacturing new lumber produces approximately 1.4 lbs of CO₂ per board foot when accounting for harvesting, transport, and milling. Reclaimed lumber skips most of these steps.
- Water saved: The lumber production process — from tree growth irrigation to sawmill operations — consumes roughly 5.4 gallons of water per board foot.
- Landfill space: Each board foot of lumber occupies about 0.08 cubic feet of landfill space. Diverting wood from landfills also prevents methane emissions from decomposition.
- Energy saved: Producing new lumber from standing timber requires approximately 1.1 kWh per board foot in harvesting, transport, and milling energy.
Hardwood species receive a 25% multiplier because they grow more slowly, meaning each board foot of reclaimed hardwood represents a greater proportional saving of time, resources, and ecological value.
Why It Matters
Climate Action
Construction and demolition waste accounts for over 25% of landfill volume in the U.S. Choosing reclaimed lumber directly reduces greenhouse gas emissions.
Forest Preservation
Every piece of reclaimed wood keeps a living tree standing. Old-growth forests are irreplaceable carbon sinks and biodiversity habitats.
Circular Economy
Reclaimed lumber extends the useful life of wood by decades. Building with salvaged material keeps resources cycling instead of being discarded.
The Science Behind Each Metric
Each number the calculator displays represents a real-world environmental impact backed by published lifecycle assessment data. The sections below explain how each metric is calculated, what assumptions go into the math, and why these particular numbers matter for the planet.
Trees Saved — The Forest Math
A typical mature timber tree (12 to 20 inches in diameter, 60 to 80 feet tall) yields approximately 200 board feet of usable lumber after harvest, transport, and milling. Smaller trees produce less; larger old-growth trees can produce far more. The 200 BF/tree average comes from U.S. Forest Service yield data for second-growth Douglas Fir, the most heavily harvested timber species in the western United States.
When you reuse a board foot of reclaimed lumber, you eliminate the demand that would otherwise drive harvest of approximately 1/200th of a tree. Multiplied across thousands of board feet in a typical building project, this reduction in demand directly translates into trees that remain standing — trees that continue to sequester carbon, stabilize soils, filter water, and provide habitat for wildlife.
CO₂ Offset — The Carbon Math
New lumber production releases carbon dioxide at every stage: harvesting equipment burns diesel, logs are trucked to mills, sawmills consume electricity (often from fossil-fuel generation), kiln drying requires heat (typically natural gas or biomass), and finished lumber is shipped to distribution centers and building sites. The Athena Sustainable Materials Institute estimates the cradle-to-gate carbon footprint of new framing lumber at approximately 1.4 lbs of CO₂ per board foot.
Reclaimed lumber bypasses most of these emissions. The wood already exists, the harvesting already happened decades ago, and the transport distances are typically much shorter (regional rather than transcontinental). The remaining carbon footprint of reclaimed lumber — mostly local transport and any re-milling — is roughly 0.2 lbs CO₂ per board foot. The difference, 1.2 lbs CO₂ per board foot, is the savings shown in the calculator.
Equally important, the carbon stored in the wood itself remains sequestered. Each board foot of lumber contains roughly 2 lbs of carbon (equivalent to about 7 lbs of CO₂) captured by the original tree from the atmosphere. Reclaimed lumber keeps that carbon locked away rather than releasing it through burning or decomposition.
Water Saved — The Hydrology Math
Lumber production consumes water at multiple stages. Tree growth itself does not count toward this figure (rainfall is essentially free), but irrigation of plantation forestry, sawmill operations (cutting fluids, dust suppression, log washing), kiln humidity control, and finishing processes all use significant fresh water. Industry studies put the total at approximately 5.4 gallons per board foot of finished new lumber.
In water-stressed regions like California, the value of water saved by choosing reclaimed lumber is amplified. A medium-sized residential project using 5,000 BF of reclaimed material saves approximately 27,000 gallons of water — enough to supply a typical household for three months. Reclaimed lumber requires negligible water in processing, so essentially the entire 5.4 gal/BF is saved per board foot.
Landfill Space — The Volume Math
Construction and demolition (C&D) waste accounts for approximately 25 to 40 percent of all waste sent to American landfills, with wood comprising the largest single category. Each board foot of lumber occupies roughly 144 cubic inches of solid volume, but loose stacking, breakage, and air space increase the effective landfill volume to about 0.08 cubic feet per board foot.
Diverting wood from landfill matters for two reasons. First, landfill space is finite and expensive — new landfills face significant siting opposition and environmental review. Second, wood that decomposes in the anaerobic conditions of a landfill releases methane, a greenhouse gas 28 times more potent than carbon dioxide on a 100-year timeframe. Recycling wood prevents both the volume occupation and the methane emission.
Energy Saved — The Joule Math
The energy content of new lumber production is dominated by three stages: harvesting (chainsaws, skidders, log loaders), transport (logging trucks, rail, ocean freight), and milling (sawmill electricity, planer motors, kiln heat). Lifecycle inventories for framing lumber put the total embodied energy at approximately 1.1 kWh per board foot, with significant variation depending on transport distance and mill efficiency.
Reclaimed lumber requires only the energy of local pickup, light reprocessing (denailing, light planing), and delivery to the customer. This brings the embodied energy down to roughly 0.1 kWh per board foot. The 1 kWh saved per board foot is equivalent to powering an LED light bulb for about 100 hours, or charging a smartphone 80 times.
Data Sources and Citations
We do not invent numbers. Every coefficient in our calculator comes from published research, government data, or peer-reviewed lifecycle assessments. The references below are the primary sources informing our methodology.
U.S. Forest Service
Harvested wood products data, tree yield estimates, growth and yield models for Western and Eastern forest types. The Forest Inventory and Analysis (FIA) program provides the foundational data on standing timber and harvest volumes.
Environmental Protection Agency
Construction and demolition waste statistics, landfill methane emission factors, and lifecycle assessment guidelines published in the EPA WARM (Waste Reduction Model) and AP-42 emissions documentation.
National Renewable Energy Laboratory
Embodied energy data for building materials, including the U.S. Life Cycle Inventory Database which provides cradle-to-gate energy and emissions factors for softwood and hardwood lumber.
Athena Sustainable Materials Institute
Lifecycle assessments specific to wood products, including the Environmental Impact Estimator for Buildings. Athena data underlies much of the carbon footprint analysis used in green building certifications.
CORRIM (Consortium for Research)
The Consortium for Research on Renewable Industrial Materials publishes detailed lifecycle inventories for North American softwood and hardwood lumber, plywood, OSB, and engineered wood products.
USDA Forest Products Laboratory
The Wood Handbook (FPL-GTR-190) provides authoritative data on wood properties, density, moisture relationships, and processing energy. It is the standard reference for wood science in North America.
What the Numbers Mean in Real-World Terms
Big numbers can feel abstract. Here is what your reclaimed lumber savings look like in terms most people can visualize.
1 Pound of CO₂ Equals...
- Driving an average passenger car about 1 mile
- Charging a smartphone 60 times
- Operating an LED light bulb for 100 hours
- Approximately 8 cubic feet of CO₂ gas at sea level
1 Tree Saved Equals...
- About 50 lbs of CO₂ sequestered per year while growing
- Shade for one parking spot or small patio
- Habitat for dozens of birds, insects, and small mammals
- Approximately 200 board feet of potential lumber
1 Gallon of Water Equals...
- One typical low-flow shower lasting 1 to 2 minutes
- Hand-watering a small garden bed
- Filling a standard pet water bowl 8 times
- About 1/200 of typical household daily use
1 Cubic Foot of Landfill Equals...
- About one full kitchen garbage bag
- One standard concrete block
- The volume of about 7.5 gallons of liquid
- Roughly the space taken by 12 board feet of stacked lumber
Project-scale perspective: A typical 2,000 square foot home contains roughly 12,000 board feet of framing lumber. Building it entirely from reclaimed material saves approximately 60 trees, 14,000 lbs of CO₂, 65,000 gallons of water, 960 cubic feet of landfill space, and 12,000 kWh of energy — equivalent to a year of electricity for an average California home.
Environmental Factors Beyond the Calculator
Our calculator quantifies the most directly measurable environmental impacts, but reclaimed lumber provides additional benefits that are harder to express as single numbers. These "co-benefits" are real, significant, and worth understanding.
Old-Growth Preservation
Less than 5% of original old-growth forest remains in the contiguous United States. Reclaimed lumber from buildings constructed before 1950 frequently contains old-growth wood that cannot be sustainably replaced even by responsible new harvesting. Choosing reclaimed reduces pressure on the few remaining old-growth stands.
Soil and Watershed Protection
Logging operations cause soil compaction, erosion, and sediment loading in nearby streams. Each tree harvest disturbs surrounding vegetation and ground cover. Avoiding even a fraction of new harvest preserves intact forest soils and the watershed services they provide.
Wildlife Habitat
Mature trees support far more biodiversity than young plantations. Specific species — from spotted owls to Pacific salamanders — depend on old-growth characteristics that cannot be replicated by plantation forestry. Reclaiming wood reduces demand for the harvest that destroys this habitat.
Air Quality
Sawmills emit particulate matter, volatile organic compounds, and combustion byproducts from kiln operations. Reduced demand for new lumber means less mill emissions and better air quality in communities near processing facilities.
Cultural and Historical Value
Reclaimed lumber preserves a tangible link to the past. Beams from a 1920s warehouse or boards from a Colonial-era barn carry stories that new material cannot replicate. Cultural value, while hard to quantify, is part of the environmental case for reclaim.
Local Economy Support
Reclaimed lumber operations are local businesses employing local workers in salvage, processing, and resale. Each board foot of reclaimed lumber represents local jobs and reduced transport emissions compared to lumber shipped across continents.
Reclaimed Lumber vs. Other Green Building Strategies
Reclaimed lumber is one of many strategies for reducing the environmental impact of construction. Each strategy has its place; the most effective projects combine multiple approaches. Here is how reclaimed lumber compares to other common green building moves.
| Green Strategy | Carbon Impact | Cost Premium | Notes |
|---|---|---|---|
| Reclaimed lumber framing | High benefit | Moderate | Largest single carbon savings of any wood choice |
| FSC certified new lumber | Modest benefit | Low | Better forest management but still new harvest |
| Cross-Laminated Timber (CLT) | High benefit | High | Replaces concrete and steel; carbon-positive in some uses |
| Insulation upgrades | Very high benefit | Low to moderate | Reduces operating energy over decades |
| Solar PV installation | Very high benefit | High initial | Eliminates ongoing fossil electricity demand |
| Heat pump HVAC | Very high benefit | Moderate | Eliminates natural gas use for heating |
| Recycled steel | Modest benefit | Low | Most U.S. structural steel already contains 70%+ recycled content |
| Low-carbon concrete | Moderate benefit | Low | Replacing portland cement with fly ash or slag |
| Salvaged fixtures & finishes | Modest benefit | Variable | Cabinetry, doors, flooring, hardware from reclaim sources |
The most effective green building projects combine all of these strategies. Reclaimed lumber addresses the “materials” portion of a building's lifecycle footprint, which typically accounts for 10 to 20 percent of total impact. The remaining 80 percent comes from operations — heating, cooling, lighting, and water heating — over the building's 50+ year lifespan.
Frequently Asked Calculator Questions
Are these numbers conservative or optimistic?
We use mid-range coefficients from published research. The actual savings for a specific project could be higher or lower depending on factors like transport distance, species, and the alternative lumber that would have been used.
Why does hardwood get a 25% multiplier?
Hardwoods like oak, walnut, and maple grow significantly slower than softwoods. A 100-year-old oak contains far more embodied carbon and ecological value than a 30-year-old plantation pine. The multiplier accounts for this difference.
Does the calculator account for transport emissions?
Yes, transport emissions for both new and reclaimed lumber are factored into the CO₂ calculation. We assume regional transport for reclaimed material and continental average transport distances for new lumber.
What about kiln drying energy?
Kiln drying is included in the energy and CO₂ calculations for new lumber. Reclaimed lumber typically does not require additional kiln drying because it has long since reached equilibrium moisture content with the environment.
How accurate is the trees-saved figure?
The 200 BF/tree figure is an industry average for second-growth Douglas Fir. Larger trees yield more, smaller trees less. For projects using primarily small dimension lumber, the per-tree yield is closer to 150 BF.
Can I use these numbers for LEED documentation?
Our calculator provides a useful estimate for general project planning and marketing. For LEED, BREEAM, or LCA documentation, you should use a certified lifecycle assessment tool with project-specific inputs and documentation.