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Lumber Weight Calculator by Species

By Nick Major · Founder, Calculator Campus Last updated May 3, 2026

This lumber weight calculator turns board dimensions, species, and moisture level into a reliable pound figure. Enter the length, width, and thickness of your stock and choose a species. The tool returns total weight for one piece or a full load. Contractors, framers, and DIYers use it to plan hauls, check floor loads, and price shipping.

Important: Informational only. Double-check any value that affects a real decision before acting on it.
Inputs

Adjust your numbers

Results update as you type.

Use dimensions for identical boards, or board feet when your invoice already lists total BF.
Choose the closest species. Select custom density if you have a supplier or lab density value.
Used only when Custom density is selected. Enter density in pounds per cubic foot.
Actual thickness, not nominal. A nominal 2× board is usually 1.5 inches thick.
Actual milled width. For example, a nominal 2×10 is about 9.25 inches wide.
Length of one piece in feet.
Board-feet mode only. Enter the total board feet for the lot, not per-piece BF.
How many identical pieces are included in the total.
12% is a common dry reference; green lumber can be far higher.
Pressure-treated adds a broad retained-water/chemical allowance; other choices document condition without changing the entered moisture.
Choose pounds or kilograms for weight outputs.
Choose the density display unit.

Assumptions

  • Dimensions are actual milled dimensions, not nominal labels such as 2×4 or 2×10.
  • Species densities are average 12% moisture-content values; individual boards can vary materially.
  • Moisture adjustment follows the Wood Handbook-style relationship below fiber saturation and a free-water estimate above about 30% MC.
  • Pressure-treated mode applies a broad 25% retained-water/chemical allowance; treatment retention varies by product.
  • The calculator treats each piece as a uniform rectangular solid and does not handle engineered wood products or mixed lots in one run.
Results

Live answer

Total weight —
Weight per piece —
Weight per linear foot —
Board feet —
Density used —
How it works

Assumptions and detail

Adds the missing weight layer on top of board-foot math: species density, moisture adjustment, pressure-treated allowance, lb/kg toggles, density visibility, and weight per linear foot for load checks.

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How the math works

The formulas and what each part means

Volume of a single piece

Multiply thickness by width by length, all measured in inches. Divide by 1,728 to convert cubic inches to cubic feet.

Volume = (Thickness × Width × Length) / 1728

Inputs in inches for T and W and inches for L give cubic feet. When length is supplied in feet, multiply T*W (in^2) by L (ft) and divide by 144 instead.

Volume from board feet

Divide board feet by 12. One board foot equals 144 cubic inches, which is one-twelfth of a cubic foot.

Volume = Board Feet / 12

One board foot equals 144 in^3, which is 1/12 of a cubic foot.

Board feet from dimensions

Multiply thickness by width in inches, then multiply by length in feet. Divide by 12 to get board feet.

Board Feet = (Thickness × Width × Length in Feet) / 12

Standard board-foot definition with T and W in inches and length in feet.

Weight of one piece

Multiply species density by volume in cubic feet. The result is the lumber weight in pounds.

Weight = Density × Volume

Density rho is selected from the species table at the chosen moisture content, or supplied directly when the user picks 'Custom density'.

Total weight

Multiply the number of pieces by species density and volume. This scales single-piece weight to the full order.

Total Weight = Piece Count × Density × Volume

Multiplies single-piece weight by the number of identical pieces.

Moisture-adjusted density

Adjust the kiln-dried density for a new moisture content. The numerator scales density up with added water; the denominator corrects for wood swelling using specific gravity.

Density at Moisture = Density at 12% × (1 + (Moisture Content − 12) / 100) / (1 + 0.84 × Specific Gravity × (Moisture Content − 12) / 100)

Approximation derived from USDA Forest Products Laboratory Wood Handbook Chapter 4, valid below the fiber saturation point (~30%). Above ~30%, free water is added linearly: rho_m = rho_30 * (1 + (m - 30) / 100). The calculator switches modes around the 30% threshold.

Weight per linear foot

Divide the cross-section area in square inches by 144 to get square feet. Multiply by density to find weight per linear foot.

Weight per Linear Foot = (Thickness × Width / 144) × Density

Cross-section area (in^2) divided by 144 converts to ft^2; multiplying by density gives weight per foot of length.

Methodology

How the answer is computed

The calculator starts by converting your nominal size to actual dimensions, since milled lumber is always smaller than its label. It then finds the board's volume in cubic feet from the actual length, width, and thickness. Next, it matches your chosen species and moisture level to a density figure. It finishes by combining that density with the board's volume and piece count to produce total pounds.

Worked examples

See the math step by step

Loading 25 Douglas fir 2×10s onto a flatbed truck

Marcus is a framing contractor loading 25 kiln-dried Douglas fir 2×10s onto his flatbed. Each board runs 16 feet with actual dimensions of 1.5 inches thick and 9.25 inches wide. He wants the total load weight before pulling out of the yard.

The volume of one board is 1.5 × 9.25 × 192 ÷ 1,728 = 1.5417 cubic feet. Douglas fir dried to 12 percent moisture has a density of 32 pounds per cubic foot. Each board then weighs 32 × 1.5417 = 49.33 pounds. Multiply that across all 25 boards, and the full load comes to 25 × 49.33 = 1,233 pounds.

Estimating weight of 24 cedar 2×6 boards for workshop shelving

Priya is building a set of open shelves in her home workshop using western red cedar. She picks up 24 boards from the local mill, each 8 feet long. The boards are 2×6 nominal with actual dimensions of 1.5 inches thick and 5.5 inches wide. She wants to know the total weight before loading her SUV.

Each board's volume is 1.5 × 5.5 × 96 ÷ 1,728 = 0.4583 cubic feet. Western red cedar dried to 12 percent moisture weighs 23 pounds per cubic foot. Each board then weighs 23 × 0.4583 = 10.54 pounds. Her full load of 24 boards comes to 24 × 10.5417 = 253 pounds.

When to use this calculator

Knowing the weight of your lumber matters most when a load limit is at stake. A pickup truck rated for 1,500 pounds fills fast with a few 2x6s and some plywood. Floor framers need total weight to confirm joists can carry the dead load of a subfloor. Shipping quotes for large lumber orders depend on gross weight, so getting a number upfront saves time with the carrier.

Why Species Matters

Wood density varies widely from one tree species to the next. A pine rafter and a white oak beam of the same size can differ by hundreds of pounds. The species you choose in the calculator has more effect on the final number than almost any other input.

Moisture Content and Weight

Freshly cut wood holds a large amount of water inside its fibers. That water adds real weight to every board. A green Douglas fir 2x8 can weigh 30 to 40 percent more than the same piece after kiln drying. Setting the correct moisture level in the calculator makes a big difference for loads involving green or recently cut stock.

Nominal vs. Actual Sizes

Lumber is sold by its nominal size, which is the rough measurement before milling and drying. After those steps, every board ends up smaller than its label. Using actual dimensions rather than nominal ones keeps the weight close to the real number on a scale.

Assumptions

What we assume

  • The formula treats each board as a perfect rectangular solid with uniform density throughout.
  • The result assumes straight stock with no warp, bow, or cup along its length.
  • The formula counts the wood fiber alone and does not add hardware, adhesives, or any attached material.
  • The result is based on a single moisture content value applied evenly across the whole board.
  • The formula uses a single density figure for each species and does not split heartwood from sapwood.
Limitations

What this skips

  • Does not account for pressure-treated lumber, which absorbs treatment chemicals that add measurable weight.
  • Excludes rough-sawn lumber, where actual dimensions can run larger than standard surfaced stock.
  • Does not cover species outside the built-in density table, such as tropical hardwoods.
  • Ignores knots, voids, and grain irregularities that lower the actual mass of a given board.
  • Does not apply to engineered wood products like LVL or glulam, which use different density values.
Common mistakes

What people miss

  • You enter the nominal size, like 2×4, instead of the actual size, 1.5 × 3.5 inches. That gap makes the volume too large.
  • Mixing board feet with linear feet gives the wrong volume input and throws off the result.
  • Forgetting to multiply by the number of pieces gives you the weight of a single board only.
  • You pick a dry-wood density when the lumber is still green, so the result comes in too low.
  • Adding the width and depth instead of multiplying them gives a wrong cross-section and a wrong final weight.
References

References

  1. Weight calculator — wooduchoose.com

    wooduchoose.com · accessed 2026-05-03

  2. Lumber weight calculator — timberbuild.com

    timberbuild.com · accessed 2026-05-03

  3. Calculating the weight of lumber — woodweb.com

    woodweb.com · accessed 2026-05-03

  4. Lumber weight calculator — dumpsters.com

    dumpsters.com · accessed 2026-05-03

  5. Calculating the green weight of wood species — extension.psu.edu

    extension.psu.edu · accessed 2026-05-03

  6. Calc — woodweb.com

    woodweb.com · accessed 2026-05-03

  7. Log weight calculator — catalesawmill.com

    catalesawmill.com · accessed 2026-05-03

Frequently asked questions

What is the weight of pressure-treated lumber?
Pressure-treated lumber carries added chemicals and water that make it heavier than untreated dry boards. Expect it to weigh roughly 15 to 25 percent more than the same species at kiln-dried density. Use a pressure-treated density value in your calculation rather than the standard dry figure.
How do I calculate the weight of lumber per board foot?
Multiply the board footage by the density of your wood species in pounds per board foot. Green lumber runs about 3 to 4 pounds per board foot, while kiln-dried stock runs about 2 to 3 pounds. Pick one species density table and use it for every piece to keep your totals consistent.
How do I use board feet to calculate total lumber weight?
Find the weight of one board by multiplying its board footage by the species density in pounds per board foot. Then multiply that single-piece result by the number of pieces to get your total load weight. Compare the total against truck or trailer limits to know when to split a haul.
What is the difference between nominal and actual lumber dimensions for weight calculations?
Nominal sizes are the labels mills use for marketing, not the true measurements of the board. A 2x4, for example, actually measures 1.5 by 3.5 inches after milling and drying. Always enter the actual milled dimensions into a weight calculator, or your volume and weight will come out too high.
How does moisture content affect lumber weight?
Green lumber can weigh 30 to 60 percent more than the same species kiln-dried at low moisture. Always match your density value to the moisture state of the wood you are weighing.

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