BuildRule
58 free calculators

Construction calculators
that show their working

Cubic yards, bag counts, roofing squares and material quantities in seconds. Every tool explains the formula it uses, so you can check the number rather than trust it.

58Calculators
6Trades covered
FreeNo sign-up, no app

Concrete

Volume, bag counts, rebar and cost for slabs, footings, columns, driveways and stairs.

Project Material CostFull materials list and cost for a whole project.Concrete Slab CalculatorCubic yards and bag counts for any rectangular slab.Concrete Bag CalculatorHow many 40, 60 or 80 lb bags of concrete do you need?Concrete Driveway CalculatorConcrete volume and area for a driveway pour.Concrete Cost CalculatorEstimate what your concrete will actually cost.Concrete Footing CalculatorVolume for strip footings and foundation trenches.Concrete Column CalculatorConcrete for round columns, piers and post holes.Concrete Stairs CalculatorConcrete volume for a flight of poured steps.Rebar CalculatorRebar quantity and total length for a slab grid.Flowable Fill CalculatorCLSM volume for trenches, voids and abandoned pipes.Curb and Gutter CalculatorConcrete for a combined curb and gutter section.Concrete Curb CalculatorConcrete volume for curbs, edging and mow strips.Concrete Pad CalculatorConcrete for shed, HVAC and hot tub pads.Concrete Mix Ratio CalculatorCement, sand and aggregate for a mix-your-own batch.

Masonry & Aggregate

Brick, block, mortar, gravel, pavers and asphalt quantities.

Brick CalculatorHow many bricks a wall needs, plus the mortar.Concrete Block CalculatorCMU block counts for a wall, plus mortar and fill.Masonry Mortar CalculatorMortar bags for brickwork and blockwork, by unit count.Gravel CalculatorCubic yards and tons of gravel, sand or topsoil.Paver CalculatorPaver counts, base gravel and joint sand for a patio.Asphalt CalculatorTons of hot mix asphalt for a driveway or lot.Retaining Wall CalculatorBlocks, base gravel and drainage for a retaining wall.Stone Veneer CalculatorSquare feet, corners and mortar for stone veneer.Masonry EstimatorUnits, mortar and reinforcement for a masonry wall.

Roofing

Roof area, pitch multipliers, shingle bundles and squares.

Roofing CalculatorRoof area, squares and shingle bundles from the footprint.Roof Pitch CalculatorConvert roof pitch to angle, slope and area multiplier.Gutter CalculatorGutter length, downspouts and roof drainage load.Metal Roofing CalculatorPanels, screws and trim for a metal roof.Metal Roof Cost CalculatorPanels, trim and total cost for a metal roof.

Interior

Drywall, insulation, tile, paint and flooring quantities.

Deck Mud CalculatorDry pack mortar for shower pans and tile beds.Drywall CalculatorSheets, screws, tape and compound for a room.Insulation CalculatorBatt packs or blown-in bags for walls and attics.Tile CalculatorTile counts, boxes, thinset and grout for any area.Paint CalculatorGallons of paint and primer for a room.Flooring CalculatorBoxes of laminate, vinyl or hardwood for a room.Baseboard CalculatorLinear feet of trim, with corners and waste.Wallpaper CalculatorRolls of wallpaper, allowing for pattern repeat.Grout CalculatorPounds of grout from tile size and joint width.Square Footage CalculatorArea of a room or plot, in any shape.Countertop CalculatorSquare footage and cost for kitchen countertops.Grout Coverage ChartGrout per square foot for every common tile size.Epoxy Floor CalculatorEpoxy kits and coverage for a garage or shop floor.Carpet CalculatorSquare yards, roll length and waste for carpet.

Landscaping

Mulch, topsoil, sod, drainage and pool volumes.

Mulch CalculatorCubic yards and bags of mulch for a bed.Topsoil CalculatorCubic yards and tons of topsoil or garden soil.Sod CalculatorRolls and pallets of sod for a lawn.Pool Volume CalculatorGallons, litres and chemical dosing volume.French Drain CalculatorGravel, pipe and fabric for a drainage trench.

Framing & Exterior

Deck boards, fencing, framing studs and siding.

Deck Board CalculatorDeck boards, joists and fasteners for a deck.Fence CalculatorPosts, rails, pickets and concrete for a fence run.Stud CalculatorStuds, plates and framing lumber for a wall.Siding CalculatorSquares of siding, trim and starter strip.Plywood Sheathing CalculatorSheets of plywood or OSB for walls, floors and roofs.Gate Post CalculatorPost size, depth and concrete for a gate.Board Foot CalculatorBoard feet and cost for hardwood lumber.Stair Stringer CalculatorRise, run and stringer length for wooden stairs.Excavation CalculatorDig volume, soil swell and truck loads.Ramp Slope CalculatorRamp length, slope and landings for a given rise.Shed Cost CalculatorFull material cost for building a shed.

Why these calculators

Construction material is measured one way and sold another. Concrete is poured in feet and inches but ordered by the cubic yard. Bricks cover an area that depends on the mortar joint, not on the brick. A roof is always larger than the building beneath it, by a factor set entirely by the pitch.

Every result includes a waste allowance. Ordering short costs far more than ordering slightly over — a second delivery, a cold joint, or a colour mismatch between production runs.

Nothing here needs an account and nothing is sent to a server: the calculators run entirely in your browser.