Woodworking calculator
Wood Weight Calculator
Knowing how much a board or finished piece weighs helps you plan shipping, size joinery and hardware, and check whether a wall or hanging shelf can carry the load. This calculator turns the dimensions you enter into a volume, multiplies by the specific gravity of your chosen species, and reports the weight in pounds. Pick a wood, set the length, width, and thickness, and read the estimated weight for one board or the whole stack.
How it works
Weight comes straight from volume and density. The tool finds the volume of your board in cubic feet, then multiplies by the wood density. Density is given here through specific gravity, the ratio of the wood density to the density of water, so multiplying specific gravity by 62.4 pounds per cubic foot gives the wood density directly. A red oak board at a specific gravity near 0.63 works out to roughly 39 pounds per cubic foot.
The published specific gravity values are referenced at about 12 percent moisture content, the typical air-dried condition for indoor lumber. Green or freshly sawn wood holds far more water and can weigh fifty percent more or more than the dry figure, so a stack of wet lumber is much heavier than the same boards after drying. Use the heavier green number when you are moving freshly cut stock and the dry number for finished furniture.
Accurate weight matters in several jobs. Shippers price by weight, so a good estimate keeps freight costs honest. Joinery and fasteners must carry the dead load of the parts they hold, and a wall shelf or floating shelf has to transfer both its own weight and the books or gear on it into the studs behind it.
Worked example
A Red Oak board 1 in x 6 in x 8 ft (0.333 ft³) at specific gravity 0.70: 0.333 x 0.70 x 62.4 = 14.6 lb.
Frequently asked questions
What is specific gravity and how does it give weight?
Specific gravity is the density of the wood divided by the density of water. Multiply it by 62.4 pounds per cubic foot, the weight of water, to get the wood density, then multiply by volume.
Does moisture content change the weight?
Yes, quite a lot. The listed values assume about 12 percent moisture content for air-dried lumber. Green or wet wood carries much more water and can weigh fifty percent more than the same board when dry.
Why is one species so much heavier than another?
Different woods have very different cell densities. Dense hardwoods like hickory and hard maple have a high specific gravity, while softwoods like pine and cedar are far lighter for the same size of board.
Can I use this to size a wall shelf or hardware?
Yes. Estimate the weight of the shelf itself, then add the load it carries, and make sure the brackets, fasteners, and wall studs can support that combined figure with a comfortable safety margin.
How accurate is the estimate?
It is a solid average using published species density values. Individual boards vary with grain, growth rate, and moisture, so treat the result as a close estimate rather than a certified scale weight.
Related calculators
Sources
These calculators are for planning and estimation. Engineering results (shelf sag, wood movement) use published average material properties; real boards vary by grade, grain, moisture and defects. Verify load-bearing designs with a professional.