Framing & Drywall
Material quantity calculators using standard densities and coverage rates, with sensible waste margins.
Stud Wall Calculator
Estimate the studs and plates needed to frame a wall from its length, stud spacing (400/600mm) and number of openings.
Drywall Calculator
Calculate drywall sheets, screws, joint compound and tape needed from area, sheet size and a waste allowance.
Insulation Calculator
Calculate the insulation thickness needed to reach a target R-value for fiberglass batt, cellulose, spray foam or rigid foam.
Stair Calculator
Calculate stair risers, tread depth, total run and stringer length from total rise, using Blondel's rule and comfort guidance.
Wallpaper Calculator
Calculate wallpaper rolls needed from wall width and height, roll dimensions and pattern repeat.
Paver Calculator
Calculate pavers, jointing sand and bedding sand needed from area, paver size, joint gap and a waste allowance.
Fence Calculator
Calculate fence posts, rails, pickets and post-hole concrete needed from fence length, spacing and picket dimensions.
Decking Calculator
Calculate deck board rows, total linear board length and screws needed from deck size, board width, gap and waste allowance.
Plywood Calculator
Calculate how many plywood sheets you need to cover an area, based on standard sheet sizes and a waste allowance.
Floor Joist Calculator
Calculate the number of floor joists needed and total linear length from wall length, on-center spacing and joist span.
Beam Span Calculator
Estimate a beam's tributary line load, end reaction and maximum bending moment from span, joist spacing and floor load.
Beam Load Calculator
Calculate end reaction, maximum bending moment, maximum shear and total load for a simply supported beam under a uniform load.
Beam Deflection Calculator
Estimate a simply supported beam's midspan deflection under a uniform load and compare it against the common L/360 serviceability limit.
Door Header Calculator
Estimate a residential door or window header depth from opening width and wall bearing condition, using a rule-of-thumb framing guide.
Roof Truss Calculator
Calculate the number of roof trusses needed, top and bottom chord lengths, and peak height from building length, span, pitch and spacing.
Baluster Spacing Calculator
Work out how many balusters a railing span needs and the even gap between them, using the 4-inch sphere rule from the IRC/IBC guard provisions.
Miter Angle Calculator
Find the miter cut angle for any corner or multi-sided frame: corner angle ÷ 2 for two pieces, (180 − 360/n) ÷ 2 for n-sided frames, plus the saw setting.