Woodworking Calculators
Free, practical calculators for the numbers behind a build — board feet and lumber cost, seasonal wood movement and green-to-dry shrinkage, shelf span and sag, and finish coverage. Educational estimating tools for planning your projects, not a substitute for your own test cuts and shop judgement.
Board Feet Calculator
Turn a board's thickness, width, and length into board feet — for one piece or a stack — and price it at your yard's rate. The unit hardwood is sold by, and the first figure on any cut list or lumber order
Wood Movement Calculator
Estimate how far a solid-wood panel expands or contracts across the grain as humidity swings through the year, using each species' movement class — so panels, doors, and joinery survive the seasons
Lumber Cost Estimator
Price a project from its board feet and your price per board foot, with a waste factor for defects and offcuts, so the quote covers what you actually buy, not just what ends up in the piece
Shelf Sag Calculator
Predict deflection from material stiffness, thickness, span, and load, and read the longest span that stays visibly flat — the difference between a crisp shelf and a sagging one, worked out before you cut
Finish Coverage Calculator
Work out the volume of oil, varnish, shellac, or lacquer a project needs from its surface area, coat count, and the finish's spread rate, so you buy the right amount and never run dry between coats
Wood Shrinkage Calculator
Predict how much a board shrinks as it dries from green to your shop's equilibrium moisture content, using each species' radial and tangential shrinkage coefficients — the seasoning math behind stable work