WoodsMath
Free Woodworking Calculators
Free online calculators for woodworking, furniture making, and lumber projects. Work out board feet, joinery, finishes, and material quantities. Fast, accurate, no sign-up required.
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Popular Calculators
The woodworking calculators people reach for most — ranked by what's actually used.
Shelf Span CalculatorShelf Span Calculator that gets midspan sag in panel and solid wood shelves, plus the longest span, the load at…Dowel Spacing CalculatorDowel Spacing Calculator that lists each hole center from both ends, even or tight at the ends, with hole depth,…Router Bit Speed CalculatorRouter Bit Speed Calculator that caps RPM by bit size, turns it into a router dial setting, and sets a…Tongue and Groove CalculatorTongue and Groove Calculator that counts the boards to fit a wall, ceiling or full room by face width, with…Oil Finish CalculatorOil Finish Calculator that splits thinned tung oil into oil and solvent, fits Osmo coverage to the applicator and lists…Timber Volume CalculatorTimber Volume Calculator for sawn timber and logs. It finds cubic feet, board feet and the metric total, or a…Pocket Hole CalculatorPocket Hole Calculator that picks a Kreg screw off the thinner of the two boards and your jig, sets its…Bookcase CalculatorBookcase Calculator that turns outside case size into even shelf spacing, floor marks, a cut list, 4x8 sheet count, book…Dust Collection CalculatorDust Collection Calculator that totals static pressure in a duct run, checks duct speed in FPM and finds the airflow…
Recently Added Calculators
The newest tools added to WoodsMath, fresh off the bench.
Spindle Speed CalculatorSpindle Speed Calculator giving RPM from surface speed, end mill feed with chip thinning, plus the lathe RPM, feed and…Bowl Segment CalculatorBowl Segment Calculator giving the saw angle, long and short points and strip rip width for each ring, sized to…Cabinet Door CalculatorCabinet Door Calculator sizing each door from the opening for overlay, inset or frameless cabinets, then listing stile, rail and…Hinge CalculatorHinge Calculator giving the hinge count, cup boring and overlay for Blum cabinet hinges, plus the butt hinge size, count…Bed Frame CalculatorBed Frame Calculator fitting a wood frame to your real mattress, with rail cuts, slats within Purple or Tempur-Pedic gap…Chair Angle CalculatorChair Angle Calculator turning rake and splay into the sightline and resultant to bore at, corrected for seat tilt, with…Five Cut Method CalculatorFive Cut Method Calculator that turns two strip widths into the exact fence move, its direction and adjuster screw turns…Floor Waxing CalculatorFloor Waxing Calculator that works out floor finish gallons, stripper at your dilution and crew labor hours for a strip…Plywood CalculatorPlywood Calculator for subfloor, wall and roof sheathing. It lays the sheets out over the joists for a true count,…