Decks, lumber & stairs Calculators
Updated Formulas shown
Deck boards, joists, board feet and stair stringers. Every calculator shows its formula and works on your phone at the job site.
Related calculators
- Deck CalculatorFree deck calculator: deck boards, joists at 16 in on center and screws for wood or composite decking.
- Deck Board CalculatorCalculate deck boards for wood or composite decking by deck size, board width, gap and board length.
- Board Foot CalculatorCalculate board feet for hardwood and lumber: thickness × width × length, with quantity and price per board foot.
- Stair CalculatorStair calculator: number of steps, riser height, tread run, stringer length and angle from total rise, checked against IRC code.
- Rafter Length CalculatorCalculate common rafter length from building span, roof pitch, overhang and ridge thickness, with plumb and seat cut angles.
- Plywood CalculatorCalculate 4×8 or 4×10 sheets of plywood or OSB for subfloors, walls and roofs, with waste and cost.
- Stud CalculatorCalculate wall studs at 12, 16 or 24 inches on center, plus extras for corners and openings and plate lumber.
- Deck Stain CalculatorCalculate gallons of deck stain from deck size, railing length, coats and coverage per gallon.