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Calculators/Everyday/Home & build

Home & build calculators

Quantities and sizing for renovation, landscaping and trade work: paint, tiles, concrete, timber and roofing, with the waste allowance on each.

Paint requiredLitres of paint for walls, allowing for doors and windows.Flooring & tilesBoxes of tiles or boards needed, including wastage.Concrete volumeCubic metres for a slab, footing or set of posts.Mulch, soil & gravelBulk material for a garden bed at a given depth.Roof pitch & rafter lengthAngle, slope factor and true roof area.Fencing & decking materialsPosts, rails and boards for a run of fence or deck.Air conditioner sizingCooling capacity for a room, adjusted for sun and occupancy.Tank & pool volumeCapacity of a rectangular or round tank in litres.Soil CalculatorHow much soil or potting mix is needed to fill a garden bed, raised bed or pot, in volume and bags.Decking CalculatorDeck area, boards needed, screws and an estimated material cost from your deck dimensions.Steel Plate Weight CalculatorWeight of a steel plate from its length, width and thickness, with an editable density.Drywall sheets neededPlasterboard sheets for a room, allowing for openings and waste.Bricks or blocks neededMasonry units for a wall, from unit size and mortar joint thickness.Stair rise & runStep count, riser height and comfort check for a straight staircase.Pavers & bedding sandNumber of pavers and bedding sand volume for a patio or path.Roof shingle bundlesBundles of shingles needed, accounting for slope and waste.Board feet of lumberBoard feet and cost for a batch of dimensional lumber.Baluster / spindle spacingEven spindle count and gap for a stair or deck railing.Wallpaper rolls neededRolls required for a room, accounting for pattern repeat.Wall stud countStuds needed for a wall on a chosen centre spacing, plus openings.Ladder angle & base distanceSafe base distance and length for a leaning ladder, using the 4-to-1 rule.Insulation thickness & coverageThickness needed to hit a target R-value, and rolls required for an area.Beam DeflectionMaximum deflection of a cantilever or simply-supported beam under a point load, from its length, load and stiffness.Bending StressMaximum bending stress in a beam from the applied bending moment, distance to the extreme fibre and second moment of area.Pipe Volume CalculatorInternal volume a pipe can hold in litres and cubic metres, from outer diameter, wall thickness and length.Gravel CalculatorVolume and weight of gravel needed for an area and depth, with an editable density and bag size.Glass Weight CalculatorWeight of a flat glass pane from its length, width and thickness, with an editable density for different glass types.Concrete Weight CalculatorWeight of a concrete slab, footing or block from its dimensions, with an editable density.Pitch CalculatorRoof pitch as a rise:run ratio, angle in degrees and slope percentage, from rise and run measurements.Sand CalculatorVolume and weight of sand needed for an area and depth, with an editable density and bag size.Pipe Fall CalculatorDrainage or pipe fall in mm of drop per metre of run, for a given slope angle in degrees.Aluminium Sheet Weight CalculatorWeight of an aluminium sheet or plate from its length, width and thickness, with an editable density.Tonnage CalculatorEstimated air conditioning tonnage needed for a room or building, from its floor area and a climate guideline.Mitre Cut CalculatorMitre saw angle needed on each piece to join two pieces of trim or framing at a given corner angle.Fence Picket SpacingHow many pickets fit a fence run at a chosen width and gap, adjusted to fit evenly.Lawn Mowing Cost CalculatorEstimated cost per mow and per year for a lawn, from your own area and price inputs.Road Base CalculatorVolume and weight of road base needed for a driveway or path, with an editable density and bag size.Brick Course Height CalculatorHeight of one brick course, and how many courses reach a target wall height.CFM Airflow CalculatorAirflow in cubic feet per minute, from duct area and air velocity, or from room volume and air changes per hour.Balustrade Spacing CalculatorHow many balusters fit a railing run within a maximum allowable gap, adjusted to fit evenly.GPM to LPM CalculatorConverts flow rate between gallons per minute and litres per minute, US or imperial gallon, either direction.Carpet quoteTotal carpet cost for a room from area, carpet price per m², underlay and installation.Belt Length CalculatorLength of a flat or V-belt wrapped around two pulleys, from their diameters and centre distance.Door / window header sizeMinimum header depth for a rough opening, using the standard light-framing rule of thumb.Fence post hole depthHow deep to set a fence or deck post below grade, and the total post length to buy.Post hole concreteConcrete needed to set posts in round holes, allowing for the post itself.Board and batten sidingBattens needed to cover a wall at a chosen spacing, plus base board coverage.French drain materialsGravel and pipe needed for a French drain trench.Rebar for a concrete slabBar count and total length for a two-way rebar grid in a slab or footing.Tile grout neededWeight of grout for a tiled area, from tile size and joint dimensions.Ramp slope & lengthSlope ratio, angle and ramp length for a given rise, checked against the ADA maximum.Bending MomentMaximum bending moment in a simply-supported or cantilever beam, from its load and span.Wall Stud Spacing CalculatorNumber of wall studs needed for a wall length at a chosen on-centre spacing.Concrete Cylinder StrengthCompressive strength of a standard concrete test cylinder from its failure load.Moisture Content CalculatorMoisture content of a material from wet and dry weight, on either a wet basis or a dry basis.Pavers Need CalculatorNumber of individual pavers needed to cover an area, from paver size and a waste allowance.Shed Cost EstimatorRough materials cost for a shed from floor area, a materials price per m², and optional slab, roofing and extra costs.Mortar CalculatorMortar volume and bags needed for a brick or block wall, from wall size and joint thickness.Cubic Volume CalculatorVolume of a rectangular box from length, width and height, in cubic metres, cubic feet and litres.Concrete Mix Ratio CalculatorCement, sand and aggregate quantities for a target volume, from any editable mix ratio.Steel Bar Weight CalculatorWeight of a round steel bar or rod from its diameter, length and density.1 in X Fall Ratio CalculatorConverts a drainage or slope ratio written as "1 in X" into an actual fall in mm over a given run length.Battery Amp Hour CalculatorAmp-hour capacity needed to run a known current draw for a set number of hours.Miter Cut Angles CalculatorThe miter angle to cut on each piece of a regular multi-sided frame, from the number of equal sides.Ha per Hour CalculatorWork rate in hectares per hour from an area covered and the time taken, or the time needed to cover a target area at that rate.GPM CalculatorWorks out flow rate in gallons per minute from a volume of liquid and the time it took to move.Retaining wall blocksNumber of retaining wall blocks for a wall from its length, height and block size.Deck footing countNumber of footings for a deck frame at a chosen maximum footing spacing.Well water volumeWater volume held in a well casing from its diameter and the water column depth.Roof truss countNumber of roof trusses for a building length at a chosen on-centre spacing.Board-on-board fenceBoards, posts and rails for a board-on-board fence, from the board overlap.Taper CalculatorTaper ratio and included angle of a shaft or workpiece from its large diameter, small diameter and length.Fabric CalculatorLength of fabric needed for a rectangular project, from its dimensions, fabric width and a wastage allowance.Thread Pitch CalculatorConvert between metric thread pitch and threads per inch (TPI) for screws, bolts and taps.Battery Charging Time CalculatorHours to charge a battery from its amp-hour capacity, current charge state and charging current.Sandstone Block Weight CalculatorWeight of a rectangular sandstone block from its length, width, height and density.Metric Thread CalculatorMajor, pitch and minor diameter, and tap drill size, for a standard ISO metric thread designation.Slope Percentage CalculatorConverts a rise and run into a percentage grade and an angle in degrees, for ramps, driveways or any general slope.Silicone Sealant CalculatorCartridges of silicone sealant or caulk needed for a run of joints, from bead size and cartridge volume.Roof Truss Cost Australia CalculatorTotal roof truss cost from the truss count needed for a building length and a free price per truss.Picket Spacing CalculatorHow many pickets fit a fence run and the actual evenly-distributed gap between them.Timber Beam Span CalculatorSimplified deflection check for a simply-supported timber beam under a uniform load, as a rough guide only.Vinyl Flooring Cost CalculatorTotal cost of vinyl flooring from area, price per square metre and wastage.Timber Weight Australia CalculatorWeight of a length of timber from its dimensions and species density, with common Australian species as presets.Stair Angle CalculatorStair pitch angle from total rise and run, with per-step rise and going and a code-comfort check.Occupancy Load CalculatorMaximum occupancy for a floor area, from a chosen occupant load factor per square metre.Square Footage CalculatorWork out the area of a room or space in square feet from its length and width.Wall Framing Stud CalculatorHow many studs a wall needs at a chosen spacing, plus the plate timber, allowing for openings and corners.Pipe Grade and Fall CalculatorConverts a drainage pipe grade into the fall over a run, in either direction, as a ratio, percentage and angle.Speaker Box Internal Volume CalculatorInternal volume of a rectangular speaker enclosure from its external dimensions and panel thickness.Rainwater harvesting yieldWater a roof collects from a given rainfall, and how long a tank takes to fill.Pipe weightWeight of a length of hollow pipe from its diameter, wall thickness and material.Rolling offset (pipefitting)True offset, travel and run for a pipe that must dodge an obstacle both sideways and up.Concrete block core fillGrout volume to fill the hollow cores of concrete masonry blocks.Insulation upgrade paybackYearly energy saved by raising the R-value of one building element, and how long the upgrade takes to pay for itself.Septic tank sizingWorking volume and sludge allowance for a septic tank from occupancy, daily flow and retention time, with the desludging interval it implies.Floor area ratio (FAR)Ratio of building floor area to lot size, and the max floor area a zoning FAR limit allows.Paver sand neededVolume and weight of bedding or joint sand needed to cover a paver area at a given depth.Arch radius from rise and spanRadius of the circular arc that gives a doorway or window arch its rise and span.Sheet metal bend allowanceFlat pattern length added by a bend, from thickness, radius, angle and the K-factor.Sheet metal punch forceForce needed to punch a hole through sheet metal, from the hole perimeter and material.Bolt circle spacingStraight-line spacing between adjacent bolt holes evenly spaced on a bolt circle.Air changes per hourHow many times an hour a ventilation system replaces a room's air.Bathroom mirror sizeRecommended mirror width and height from your vanity and ceiling.Furnace size (BTU)Heating capacity needed for a home, from floor area, climate band and insulation.Metal bar & sheet weightWeight of a metal plate, bar or round rod from its dimensions and material density.Lumber weightWeight of dimensional lumber or a stack of boards, from species density and count.

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