61 Free AU Trades Calculators
No login, no paywall, no upsell. Pick a calculator, get an instant result. Built for owner-builders and trade students across NSW and Australia.
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Stairs & Framing
Stairs CalculatorCalculate stair rise, going, step count and stringer length for AU residential stairs.Stair Stringer Cut CalculatorCalculate stringer plumb cut and level cut angles from riser and going dimensions.Wall Framing CalculatorCalculate studs, plates and noggin lineal metres for a timber-framed wall.Truss Spacing CalculatorCalculate the number of roof trusses required for a given roof length and spacing.Roof Truss CalculatorEstimate top chord length and ridge height for a standard roof truss from span and pitch.Beam Span CalculatorRule-of-thumb beam depth estimate for AU residential timber beams from span.Pier & Beam Footing CalculatorEstimate footing pad size from point load and soil bearing capacity.Raked Wall CalculatorCalculate stud count and heights for a raked or skillion wall between two heights.Balustrade Spacing CalculatorCalculate baluster count and spacing to meet the NCC 125mm maximum gap rule.
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Roofing
Roof Rafter CalculatorCalculate rafter length and birdsmouth setback from span, pitch and overhang.Roof Pitch CalculatorConvert between rise/run, degrees, ratio and percentage for roof pitch.Roofing CalculatorCalculate true roof area and material required including pitch multiplier and waste.Metal Roof Cost Calculator (Colorbond)Estimate Colorbond metal roofing cost from roof area and supply/install rate.Gutter CalculatorSize gutter capacity and downpipe count from catchment area and rainfall intensity.
Concrete & Masonry
Concrete Volume CalculatorCalculate cubic metres of concrete for slabs, footings and walls including wastage.Concrete Bag CalculatorCalculate how many bags of premix concrete are needed for a given volume.Concrete Cost CalculatorEstimate total cost of a concrete pour including delivery surcharge.Concrete Quantities CalculatorCalculate cement, sand and aggregate quantities for site-mixed concrete (1:2:3 mix).Concrete Pier CalculatorCalculate concrete volume for a round pier or post hole footing.Concrete Block CalculatorCalculate the number of concrete/Besser blocks needed for a wall.Concrete Block Fill CalculatorCalculate core-fill concrete volume for reinforced block walls.Concrete Column CalculatorCalculate concrete volume for a round or square structural column.Brick CalculatorCalculate bricks, mortar volume and wastage for a brick wall.How Many Bricks Per M²?Quick lookup for bricks per square metre by brick size and mortar joint width.Mortar CalculatorCalculate mortar volume and bags required for brickwork or blockwork.Grout CalculatorCalculate tile grout volume and bags required from tile size and joint width.Retaining Wall CalculatorEstimate sleepers/blocks and concrete required for a retaining wall.Retaining Wall Block CalculatorCalculate segmental retaining wall block quantity from wall area.
Decking, Flooring & Fencing
Decking CalculatorCalculate decking boards, joists and bearers required for a deck.Deck Board Spacing CalculatorCalculate even deck board layout and adjusted gap size to fill a fixed width.Fencing CalculatorCalculate posts, rails and palings required for a timber fence.Fence Post Spacing CalculatorCalculate post count and even spacing for a fence run.Flooring CalculatorCalculate flooring boards and boxes required for a room, including waste.Tile CalculatorCalculate tiles needed for a floor or wall including waste allowance.Carpet CalculatorCalculate carpet required from room dimensions and standard roll width.
Finishes
Paint CalculatorCalculate litres of paint needed based on area, coats and coverage rate.Wallpaper CalculatorCalculate wallpaper rolls required from wall dimensions and roll coverage.Insulation CalculatorCalculate insulation batts required from area and batt width.Insulation R-Value CalculatorCalculate total R-value from layered insulation materials.Plasterboard / Drywall CalculatorCalculate plasterboard sheets required from wall/ceiling area and standard sheet size.Epoxy Floor Coating CalculatorCalculate epoxy coating litres required for a garage or workshop floor.
Site Work & Drainage
Soil & Gravel CalculatorCalculate volume, weight and truck loads of bulk soil or gravel required.Asphalt CalculatorCalculate asphalt tonnage required from area, thickness and density.Crushed Stone / Road Base CalculatorCalculate road base or crushed stone volume and weight for driveways and paths.Paver CalculatorCalculate the number of pavers required for a patio or path including waste.Plumbing Fall CalculatorCalculate minimum pipe fall and grade per run length for drainage compliance.Pool Volume CalculatorCalculate swimming pool volume in litres for a rectangular pool with sloped floor.Tank Volume CalculatorCalculate cylindrical water tank volume in litres from diameter and height.Ramp Calculator (AU AS 1428.1)Calculate ramp length and grade, and check against the AS 1428.1 maximum accessible grade.
General Trade Math
Slope & Grade CalculatorConvert between percentage, ratio and degrees for site falls and slopes.M3 CalculatorCalculate cubic metres for rectangular or cylindrical volumes.Material Weight CalculatorCalculate the weight of construction materials from volume and density.Compound Miter CalculatorCalculate miter and bevel saw angles for crown moulding and compound cuts.Miter Angle CalculatorCalculate the saw miter angle for a given corner angle.Equal Spacing CalculatorCalculate equal gaps between posts, balusters or fixings across a fixed length.Running Measurements CalculatorConvert an individual measurement into a cumulative running dimension.3-4-5 Method CalculatorVerify a 90-degree corner using the 3-4-5 method at any scale.Triangle CalculatorSolve a right-angle triangle for sides, angle and area from two known sides.Unit ConverterConvert between metric and imperial units common in AU construction.