Calculator · Lumber & cost
Wood Weight Calculator
Estimate wood weight from species density, dimensions, moisture assumptions, and quantity.
Wood weight calculator
Preset densities are representative reference values for estimation, not exact values for every board. Real density varies by exact species, moisture content, growth conditions, and individual board.
Result
Enter dimensions and density, then calculate estimated wood weight.
How much does a 2x4x8 weigh?
A 2x4x8 weighs about 4.4 kg (9.8 lb) in coast Douglas-fir at 12% moisture content. That is for one dry board at the PS 20 dressed size of 1-1/2 × 3-1/2 in and exactly 8 ft long, a volume of 0.0083 m³. Other species:
| Species | kg | lb |
|---|---|---|
| Coast Douglas-fir | 4.44 | 9.79 |
| Loblolly pine | 4.72 | 10.4 |
| Ponderosa pine | 3.7 | 8.16 |
- Density at 12% moisture content from Wood Handbook Table 5-3a, the same presets the calculator uses.
- PS 20 lets dry lumber be dressed at up to 19% moisture, and wetter wood is heavier, so a fresh board can weigh more than this. Weigh one board, or enter a measured density, when it matters.
- Multiply by the number of boards for a bundle, or enter the size and quantity in the calculator above.
How much does a 1x6x16 weigh?
A 1x6x16 weighs about 5.8 kg (12.8 lb) in ponderosa pine at 12% moisture content. That is for one dry board at the PS 20 dressed size of 3/4 × 5-1/2 in and exactly 16 ft long, a volume of 0.013 m³. Other species:
| Species | kg | lb |
|---|---|---|
| Ponderosa pine | 5.81 | 12.82 |
| Eastern white pine | 5.09 | 11.22 |
| Coast Douglas-fir | 6.98 | 15.38 |
| Northern red oak | 9.16 | 20.19 |
- Density at 12% moisture content from Wood Handbook Table 5-3a, the same presets the calculator uses.
- PS 20 lets dry lumber be dressed at up to 19% moisture, and wetter wood is heavier, so a fresh board can weigh more than this. Weigh one board, or enter a measured density, when it matters.
- Multiply by the number of boards for a bundle, or enter the size and quantity in the calculator above.
Wood and panel density table
Solid wood densities are at 12% moisture content. Panel products are shown as ranges because the source gives a range of specific gravity for each product type, and real panels vary by maker and grade. For a specific sheet, use the density or sheet weight the manufacturer publishes.
| Material | Group | Specific gravity | kg/m³ | lb/ft³ | Source |
|---|---|---|---|---|---|
| Eastern white pine | Pine | 0.35 | 392 | 24.5 | Table 5-3a |
| Western white pine | Pine | 0.35 | 392 | 24.5 | Table 5-3a |
| Sugar pine | Pine | 0.36 | 403 | 25.2 | Table 5-3a |
| Ponderosa pine | Pine | 0.40 | 448 | 28 | Table 5-3a |
| Lodgepole pine | Pine | 0.41 | 459 | 28.7 | Table 5-3a |
| Red pine | Pine | 0.46 | 515 | 32.2 | Table 5-3a |
| Loblolly pine | Pine | 0.51 | 571 | 35.7 | Table 5-3a |
| Shortleaf pine | Pine | 0.51 | 571 | 35.7 | Table 5-3a |
| Longleaf pine | Pine | 0.59 | 661 | 41.3 | Table 5-3a |
| Slash pine | Pine | 0.59 | 661 | 41.3 | Table 5-3a |
| Western redcedar | Other softwood | 0.32 | 358 | 22.4 | Table 5-3a |
| Coast Douglas-fir | Other softwood | 0.48 | 538 | 33.6 | Table 5-3a |
| Northern red oak | Hardwood | 0.63 | 706 | 44 | Table 5-3a |
| White oak | Hardwood | 0.68 | 762 | 47.5 | Table 5-3a |
| Medium-density fiberboard (MDF) | Panel | 0.7–0.9 | 700–900 | 44–56 | Table 12-1 |
| Plywood | Panel | 0.4–0.6 | 400–600 | 25–37 | Table 12-1 |
| Particleboard | Panel | 0.6–0.8 | 600–800 | 37–50 | Table 12-1 |
| Oriented strandboard (OSB) | Panel | 0.5–0.8 | 500–800 | 31–50 | Table 12-1 |
Solid wood: mean specific gravity at 12% moisture content from Wood Handbook Chapter 5, Table 5-3a (based on oven-dry weight and volume at 12%), converted with Chapter 4, Equation 4-14: density = G × 1,000 × 1.12 kg/m³.
Panels: specific gravity ranges from Wood Handbook Chapter 12, Table 12-1 (FPL-GTR-190, 2010), multiplied by 1,000 kg/m³. The table states no moisture basis, so treat these as a rough range. Pine rows and panel ranges verified . Pound values use 16.0185 kg/m³ per lb/ft³.
Lumber sizes for the answers above come from the lumber sizes in mm chart.
How it works
This calculator estimates wood weight from dimensions, quantity, and density. Its species-specific presets are representative reference values at 12% moisture content, derived from USDA Forest Products Laboratory Wood Handbook data. You can instead enter a custom density in kg/m3 or lb/ft3.
Real density varies by exact species, moisture content, growth conditions, and individual board. Use a measured or supplier/manufacturer density when accuracy matters. This is a weight estimator, not a structural, lifting-plan, transport-certification, or engineering tool.
- Volume in cubic metres = length_m x width_m x thickness_m x quantity.
- Weight in kg = volume_m3 x density_kg_per_m3.
- Weight in lb = weight_kg x 2.20462.
- If using lb/ft3 density: density_kg_per_m3 = density_lb_per_ft3 x 16.0185.
- Volume in cubic feet = volume_m3 x 35.3147.
Worked example
Four Ponderosa pine boards at 2400 mm x 140 mm x 38 mm have a total volume of about 0.0511 cubic metres.
Using the sourced Ponderosa pine reference density of 448 kg/m3 at 12% moisture content, the displayed estimated weight is 22.88 kg, or 50.44 lb.
Common mistakes
- Treating approximate species density as exact.
- Ignoring moisture content, which can change weight substantially.
- Using nominal lumber/timber dimensions instead of actual dimensions.
- Forgetting quantity when estimating lifting, transport, shelving, or hardware loads.
Common questions
Are the species densities exact?
No. They are representative estimates at 12% moisture content. Density varies by exact species, moisture content, growth conditions, and individual board.
Can I enter custom density?
Yes. A custom density in kg/m3 or lb/ft3 overrides the preset and is preferred when you have a measured or supplier/manufacturer value.
Does moisture content affect wood weight?
Yes. Wet or green wood can weigh much more than dry wood, so verify material condition when weight matters.
How much does a 2x4x8 weigh?
A 2x4x8 weighs about 4.4 kg (9.8 lb) in coast Douglas-fir at 12% moisture content, using the dry dressed size 1.5 × 3.5 in and a length of 8 ft. Loblolly pine: 4.7 kg (10.4 lb); Ponderosa pine: 3.7 kg (8.2 lb).
How much does a 1x6x16 weigh?
A 1x6x16 weighs about 5.8 kg (12.8 lb) in ponderosa pine at 12% moisture content, using the dry dressed size 0.75 × 5.5 in and a length of 16 ft. Eastern white pine: 5.1 kg (11.2 lb); Coast Douglas-fir: 7 kg (15.4 lb); Northern red oak: 9.2 kg (20.2 lb).
Can I use this for lumber and timber?
Yes. Enter actual dimensions and quantity for the boards, posts, beams, panels, or timber pieces you are estimating.
Sources
- Wood Handbook—Wood as an Engineering Material, Chapter 5: Mechanical Properties of WoodUSDA Forest Service, Forest Products LaboratoryTable 5-3a mean specific gravity at 12% moisture content for the species presets and the pine rows in the density table.
- Wood Handbook—Wood as an Engineering Material, Chapter 4: Moisture Relations and Physical Properties of WoodUSDA Forest Service, Forest Products LaboratoryEquation 4-14, used to turn specific gravity at 12% into density at 12% moisture content.
- Wood Handbook—Wood as an Engineering Material, Chapter 12: Mechanical Properties of Wood-Based Composite MaterialsUSDA Forest Service, Forest Products LaboratoryTable 12-1 specific gravity ranges for MDF, plywood, particleboard and OSB (FPL-GTR-190, 2010).
- Voluntary Product Standard PS 20-20: American Softwood Lumber StandardU.S. Department of Commerce, National Institute of Standards and TechnologyTable 3 dry dressed sizes used for the 2x4x8 and 1x6x16 answers.