All woodworking and lumber calculators
Every calculator on the site, grouped by project. Each one works in US or metric units and shows the formula behind the result.
Lumber & board feet
- Board Foot CalculatorBoard feet for one board or a stack, with volume and cost per board foot.
- Hardwood Tally CalculatorBoard feet for a stack of random-width hardwood, tallied board by board the way the yard does.
- Board Feet to Linear Feet CalculatorConvert a board-foot quantity into running length for any thickness and width.
- Lumber Dimensions CalculatorActual size of a 2×4, 2×6, 4×4 and other nominal lumber, with board feet.
- Wood Weight CalculatorEstimate the weight of boards, beams, slabs and 4×8 sheets of plywood, OSB or MDF.
- Cut List CalculatorHow many boards to buy for any list of pieces, and where to cut each one — plus a rough hardwood takeoff in board feet.
Plywood, stain & finish
Firewood & logs
Stairs, decks & fences
- Stair Stringer CalculatorHow many steps, the height of each step, the run and stringer length — from the height of your deck or floor.
- Deck Board CalculatorDeck boards, linear footage and screws for a rectangular deck.
- Deck Joist Span CalculatorWill your deck joists work? Maximum span and overhang from IRC Table R507.6, with a pass/fail check.
- Board and Batten CalculatorEven batten spacing and material for a board and batten accent wall.
- Shiplap CalculatorRows, linear feet and boards of shiplap for a wall, from the board’s coverage width.
- Fence Picket CalculatorPickets, posts and rails for a straight run of wood fence.
- Baluster Spacing CalculatorHow many deck or stair balusters per railing section, and the exact even gap between them.
Angles, frames & shelves
- Shelf Sag CalculatorEstimate how much a wood, plywood or MDF shelf will sag under a load.
- Wood Movement CalculatorHow much a board or tabletop will expand and shrink with seasonal moisture.
- Miter Angle CalculatorMiter saw angle and piece lengths for a square, hexagon, octagon or any n-sided frame — or any single corner.
- Compound Miter CalculatorBlade bevel and miter settings for boxes and planters with sloped sides, plus side-board width and edge lengths.
- Crown Molding CalculatorMiter and bevel settings for crown molding at any wall corner and spring angle, lying flat or nested — plus how much to buy.
- Picture Frame CalculatorMoulding length and cut sizes for a frame around a print or photo.
Framing & roofing
- Rafter Length CalculatorCommon rafter length from span and pitch, with overhang, the board length to buy, birdsmouth, HAP and ridge height.
- Hip & Valley Rafter CalculatorHip or valley rafter length from width and pitch — 16.97 unit run, overhang, side cuts, backing and dropping.
- Jack Rafter CalculatorHip jack rafter lengths from pitch and spacing: the common difference, every jack’s cut length, side cuts and count.
- Wall Stud CalculatorStuds, plates and plate boards for a framed wall at 16 or 24 in on center.