Free calculators
Board foot calculator
Work out board feet for any stack of lumber: thickness × width × length ÷ 12, plus a waste allowance and the cost at your yard's price per board foot.
Shelf sag calculator
Estimate how far a solid wood shelf sags under load, using stiffness values from the USDA Wood Handbook, and check it against a 0.02 in/ft target.
Wood movement calculator
Estimate how much a solid wood panel or tabletop swells and shrinks with moisture, using USDA Wood Handbook dimensional change coefficients.
Epoxy river table calculator
Work out how much epoxy a river table or resin pour needs: length × width × depth, converted to gallons and liters, with waste and the number of pours.
Wood finish coverage calculator
Calculate how much oil, varnish or polyurethane a project needs: surface area × coats ÷ the coverage on the can. Works in gallons, quarts and liters.
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