Concrete & foundations
Concrete slab
Calculate concrete for a rectangular slab, pad or floor.
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100 calculators
Tap to save a toolConcrete & foundations
Strip footing
Estimate concrete volume for rectangular strip footings.
Open calculatorConcrete & foundations
Round concrete column
Estimate concrete for circular columns or piers.
Open calculatorConcrete & foundations
Post-hole concrete
Calculate concrete around round posts in round holes.
Open calculatorConcrete & foundations
Concrete bags
Turn a concrete volume into a whole number of bags.
Open calculatorEarthworks & excavation
Excavation volume
Measure a rectangular excavation in cubic units.
Open calculatorEarthworks & excavation
Trench volume
Calculate the volume of a constant-width trench.
Open calculatorEarthworks & excavation
Backfill quantity
Estimate volume and weight for a rectangular backfill area.
Open calculatorEarthworks & excavation
Spoil truckloads
Estimate loads after excavated material expands.
Open calculatorEarthworks & excavation
Site slope
Convert a measured rise and run into gradient and angle.
Open calculatorBricklaying & masonry
Brick quantity
Estimate facing bricks from wall area and joint size.
Open calculatorBricklaying & masonry
Concrete block quantity
Estimate blocks for a single-leaf wall.
Open calculatorBricklaying & masonry
Mortar bags
Convert a known mortar volume into bags.
Open calculatorBricklaying & masonry
Render quantity
Estimate render mass from area, thickness and density.
Open calculatorBricklaying & masonry
Stone veneer packs
Estimate packs of stone veneer for a measured wall area.
Open calculatorCarpentry & framing
Wall studs
Estimate regularly spaced studs plus specified extras.
Open calculatorCarpentry & framing
Timber volume & board feet
Calculate solid timber volume and board feet.
Open calculatorCarpentry & framing
Plywood sheets
Estimate sheet quantities for plywood coverage.
Open calculatorCarpentry & framing
Wall plates
Estimate stock timber for plate runs.
Open calculatorCarpentry & framing
Cladding packs
Estimate cladding packs using their effective cover area.
Open calculatorRoofing & guttering
Pitched roof area
Convert a horizontal footprint into pitched roof area.
Open calculatorRoofing & guttering
Roofing bundles
Estimate roofing bundles from the actual sloping area.
Open calculatorRoofing & guttering
Roof underlay
Estimate underlay rolls with side-lap allowance.
Open calculatorRoofing & guttering
Gutter lengths
Estimate stock gutter lengths for straight runs.
Open calculatorRoofing & guttering
Downpipe lengths
Estimate stock pipe lengths for downpipe runs.
Open calculatorDrywall & plastering
Drywall sheets
Estimate plasterboard sheets after deducting openings.
Open calculatorDrywall & plastering
Joint compound
Estimate joint compound containers from product coverage.
Open calculatorDrywall & plastering
Drywall screws
Estimate screws from your sheet count and fixing schedule.
Open calculatorDrywall & plastering
Ceiling battens
Estimate parallel battens across a ceiling.
Open calculatorDrywall & plastering
Plaster coat
Estimate plaster mass for a constant-thickness coat.
Open calculatorInsulation
Insulation batt packs
Estimate batt packs from net insulated area.
Open calculatorInsulation
Rigid insulation boards
Estimate rigid boards from the area to cover.
Open calculatorInsulation
Insulation rolls
Estimate flexible insulation rolls.
Open calculatorInsulation
Layer R-value
Calculate thermal resistance from thickness and conductivity.
Open calculatorInsulation
Vapour barrier rolls
Estimate barrier rolls with side overlaps.
Open calculatorPainting & decorating
Room wall paint
Estimate paint for the four walls of a rectangular room.
Open calculatorPainting & decorating
Surface paint
Estimate paint from any measured surface area.
Open calculatorPainting & decorating
Primer quantity
Estimate primer containers for a prepared surface.
Open calculatorPainting & decorating
Deck stain
Estimate stain for a deck or timber surface.
Open calculatorPainting & decorating
Wallpaper rolls by area
Estimate wallpaper by effective roll coverage.
Open calculatorTiling & stone
Tile quantity
Estimate tiles and full boxes for a floor or wall.
Open calculatorTiling & stone
Tile grout
Estimate grout mass from joint geometry.
Open calculatorTiling & stone
Tile adhesive
Estimate adhesive bags using the selected product rate.
Open calculatorTiling & stone
Tile backer board
Estimate boards beneath a tiled surface.
Open calculatorTiling & stone
Tile edge trim
Estimate stock edge trims for tiled edges.
Open calculatorFlooring
Laminate & timber packs
Estimate flooring packs with a cutting allowance.
Open calculatorFlooring
Vinyl plank packs
Estimate vinyl plank or tile packs.
Open calculatorFlooring
Carpet rolls by area
Estimate carpet roll quantities by total area.
Open calculatorFlooring
Floor underlay
Estimate underlay rolls from the floor area.
Open calculatorFlooring
Floor levelling compound
Estimate levelling compound from average applied depth.
Open calculatorDecking & outdoor timber
Deck boards
Estimate full-length board rows across a deck.
Open calculatorDecking & outdoor timber
Deck joists
Estimate joists from a specified centre spacing.
Open calculatorDecking & outdoor timber
Deck fixings
Estimate screws from board-to-joist intersections.
Open calculatorDecking & outdoor timber
Deck oil & coating
Estimate finish for a measured deck surface.
Open calculatorDecking & outdoor timber
Deck fascia
Estimate fascia stock lengths around deck edges.
Open calculatorFencing
Fence posts & rails
Estimate posts and rails for one straight fence run.
Open calculatorFencing
Fence pickets
Estimate pickets from width and spacing.
Open calculatorFencing
Fence post concrete
Estimate concrete around circular fence posts.
Open calculatorFencing
Fence wire
Estimate wire rolls for multiple strands.
Open calculatorFencing
Fence coating
Estimate paint or stain for a fence.
Open calculatorLandscaping & gardening
Topsoil quantity
Estimate topsoil volume and delivered weight.
Open calculatorLandscaping & gardening
Mulch quantity
Estimate mulch volume and weight.
Open calculatorLandscaping & gardening
Turf rolls
Estimate turf rolls for a measured lawn area.
Open calculatorLandscaping & gardening
Raised-bed soil
Estimate soil for a rectangular raised bed.
Open calculatorLandscaping & gardening
Landscape fabric
Estimate fabric rolls with overlapping seams.
Open calculatorPlumbing & drainage
Pipe water capacity
Calculate the liquid held inside a circular pipe.
Open calculatorPlumbing & drainage
Pipe flow from velocity
Convert pipe diameter and average velocity into flow.
Open calculatorPlumbing & drainage
Tank fill time
Estimate the time to fill a tank at a known flow rate.
Open calculatorPlumbing & drainage
Drain fall & gradient
Calculate the gradient of a measured drain run.
Open calculatorPlumbing & drainage
Pipe stock lengths
Estimate straight pipe stock from total run lengths.
Open calculatorElectrical
Electrical power
Calculate power from voltage and current.
Open calculatorElectrical
Current from power
Calculate current for a known power and voltage.
Open calculatorElectrical
Ohm’s law
Calculate current and power in a resistive circuit.
Open calculatorElectrical
Energy use
Estimate energy consumption from power and running time.
Open calculatorElectrical
Cable length
Estimate cable stock from measured routes.
Open calculatorHVAC & ventilation
Airflow for air changes
Convert a specified air-change target into required airflow.
Open calculatorHVAC & ventilation
Round duct surface
Estimate sheet or wrap area around a straight round duct.
Open calculatorHVAC & ventilation
Rectangular duct surface
Estimate the four-sided surface of a rectangular duct.
Open calculatorHVAC & ventilation
Round duct air velocity
Calculate average velocity from airflow and diameter.
Open calculatorHVAC & ventilation
Duct wrap rolls
Estimate insulation wrap from measured duct surface area.
Open calculatorGlazing & joinery
Glass weight
Estimate glass mass from dimensions and thickness.
Open calculatorGlazing & joinery
Glazing sealant
Estimate cartridges for rectangular glazing joints.
Open calculatorGlazing & joinery
Window trim
Estimate trim around rectangular window openings.
Open calculatorGlazing & joinery
Weatherstripping
Estimate weatherstrip length around rectangular openings.
Open calculatorGlazing & joinery
Joinery panels
Estimate sheet material for measured joinery faces.
Open calculatorWaterproofing
Liquid membrane
Estimate liquid membrane from specified coverage and coats.
Open calculatorWaterproofing
Sheet membrane rolls
Estimate sheet membrane rolls with side laps.
Open calculatorWaterproofing
Waterproofing primer
Estimate primer for a waterproofing substrate.
Open calculatorWaterproofing
Joint sealant
Calculate sealant volume and cartridge quantities.
Open calculatorWaterproofing
Flashing lengths
Estimate stock flashing lengths.
Open calculatorPaving & driveways
Paver quantity
Estimate pavers and full packs for a measured area.
Open calculatorPaving & driveways
Gravel base
Estimate aggregate volume and mass for a paving base.
Open calculatorPaving & driveways
Bedding sand
Estimate sand volume and weight beneath paving.
Open calculatorPaving & driveways
Asphalt quantity
Estimate asphalt mass from finished dimensions.
Open calculatorPaving & driveways
Joint spacing layout
Count internal joints and equal panels along one span.
Open calculatorEstimating & costs
Material cost
Estimate material cost with an optional contingency.
Open calculatorEstimating & costs
Labour cost
Estimate labour cost from crew size and time.
Open calculatorEstimating & costs
Profit margin
Calculate a selling price from a target gross margin.
Open calculatorEstimating & costs
Markup
Calculate selling price by adding a markup to cost.
Open calculatorEstimating & costs
Tax on an estimate
Add a user-specified tax rate to a subtotal.
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Measure twice.
Work it out once.
Trade Estimater is a free toolbox for DIYers, homeowners and people who build for a living. It turns project measurements into practical material estimates—so you can plan your shopping list with less guesswork.
Whether you're pouring concrete, painting a bedroom or laying a patio, you'll find a calculator with editable allowances, metric and imperial units, and the formula behind the answer.
Let's work it outFind your trade
Browse 20 trade categories, or search for the material you're working with.
Add your measurements
Use metric or imperial. Adjust coverage, pack sizes and waste for your actual product.
Get a clearer estimate
See quantities instantly, with purchase amounts rounded up and assumptions explained.
A FEW USEFUL DETAILS
Before you get building.
Is Trade Estimater really free?
Yes. All 100 calculators are free to use, with no account needed. Star a calculator to save it in this browser for next time.
Can I use feet and inches?
Yes. Every calculator has a metric and imperial switch. Your measurements are converted when you change systems. Liquid measures use US gallons.
How accurate are the material estimates?
The maths follows the formula shown on each calculator. Real quantities depend on your measurements, product yields, cutting layout and waste. Check the assumptions and your supplier's specifications before ordering.
Does this replace a building design?
No. These tools estimate quantities from your inputs. Structural sizes, installation requirements and local building rules still come from the relevant project specifications and qualified professionals.