Wood Weight Calculator
Estimate the weight of lumber by species and board footage.
Total weight
How lumber weight is estimated
Wood weight depends on both its volume and its density, which varies significantly by species and moisture content. This calculator first finds the volume of your lumber in board feet using the standard formula (Thickness × Width × Length) ÷ 12, then converts board feet to cubic feet by dividing by 12 (since one board foot equals 1/12 of a cubic foot).
That cubic-foot volume is multiplied by an approximate density figure for the species selected, given in pounds per cubic foot at a typical air-dried or kiln-dried moisture content. Softwoods like spruce-pine-fir and cedar are noticeably lighter than dense hardwoods like oak and maple, which is why species selection changes the result significantly even for identical dimensions.
The per-piece weight is then multiplied by quantity to give a total weight, useful for estimating shipping costs, checking a vehicle or trailer's load capacity, or planning how a delivery will be palletized and handled on site.
Where these numbers come from
The formula and default values in this calculator are based on:
- Density figures are approximate average dry weights by species group, consistent with typical values published in wood technology references such as the USDA Forest Products Laboratory Wood Handbook; actual weight varies with moisture content and individual board density.
These are planning estimates. Check your local building code, product specifications, and a licensed contractor before you buy materials or build.
Frequently asked questions
Does moisture content affect lumber weight significantly?
Yes, substantially. Green (undried) lumber can weigh considerably more than the same board once air- or kiln-dried, since wood holds a large amount of water by weight when freshly cut. The species weights used here approximate typical dried construction or dry-use lumber, not green stock.
Why does species change the weight so much for the same size board?
Wood density varies widely by species due to differences in cell structure -- a piece of red oak is meaningfully denser, and therefore heavier, than the same size piece of cedar or spruce-pine-fir. Choosing the right species in the calculator is the single biggest factor in an accurate weight estimate.
What is this calculator useful for?
Estimating trailer or truck payload before a lumber run, checking whether a stack of material exceeds a floor's load rating during a renovation, or simply budgeting freight costs that are billed by weight.
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