Measure twice. Order once.
Calculators for concrete, gravel, mulch, stairs, land and pools. Type in what your tape measure says and get the yards, tons, bags and pieces to buy, with a drawing to check it against and the maths written out.
- Concrete CalculatorCubic yards and bags for slabs, footings, columns and steps.
- Square Footage CalculatorAdd up rooms and shapes, subtract cut-outs, price it.
- Acreage CalculatorAcres and hectares from lot measurements, any shape.
- Concrete Slab & Pad CalculatorSlab or pad with edges, base, rebar and control joints.
Concrete & paving All concrete & paving
- Concrete CalculatorCubic yards and bags for slabs, footings, columns and steps.
- Concrete Slab & Pad CalculatorSlab or pad with edges, base, rebar and control joints.
- Asphalt CalculatorTons of hot-mix asphalt for driveways and patches.
- Concrete Bag CalculatorBags, weight, trips and bag-vs-truck cost for any volume.
- Concrete Block CalculatorBlocks, courses and mortar bags for a CMU wall.
- Brick CalculatorBricks and mortar bags for walls and veneer.
- Rebar CalculatorGrid or straight-run rebar: bars, laps, feet and weight.
- Concrete Footing CalculatorWall footings and pier pads, with rebar and frost check.
- Sonotube CalculatorConcrete and tube count for round pier forms.
- Post Hole Concrete CalculatorBags of concrete per fence or deck post.
Landscaping All landscaping
- Gravel CalculatorTons and cubic yards for paths, driveways and bases.
- Mulch CalculatorBags or cubic yards for beds, tree rings and top-ups.
- Stone & Landscape Rock CalculatorTons of river rock, decorative stone or lava rock for beds.
- Cubic Feet CalculatorCubic feet of boxes, rooms and cylinders, in any units.
- Cubic Yard CalculatorAny length × width × depth in cubic yards.
- Dirt & Fill Dirt CalculatorFill dirt in yards, tons and truckloads, with compaction.
- Topsoil CalculatorYards, tons or bags for lawns, beds and levelling.
- Paver CalculatorPaver count plus base gravel and bedding sand.
- Sand CalculatorTons, yards and bags for sandboxes, pavers and pool bases.
- Pea Gravel CalculatorTons and bags of pea gravel, with playground safety depths.
- Retaining Wall CalculatorBlocks, caps, base and drainage rock for block walls.
Decks, fences & stairs All decks, fences & stairs
- Staircase & Stair Stringer CalculatorRisers, treads, run and stringer length, checked against code.
- Board Foot CalculatorBoard feet and cost for hardwood or framing lumber.
- Deck & Deck Board CalculatorDeck boards, joists and fasteners for any deck size.
- Fence & Fence Post CalculatorPosts, rails, pickets and concrete for a wood fence.
Lawn & garden All lawn & garden
Walls, floors & roofs All walls, floors & roofs
- Paint CalculatorGallons for walls, ceiling and primer, room by room.
- Roofing & Shingle CalculatorSquares, shingle bundles and trim lengths from the footprint.
- Roof Pitch CalculatorPitch, angle, rafter length and ridge height.
- Tile & Grout CalculatorTiles, boxes, grout pounds and thinset bags.
- Drywall CalculatorSheets, screws, tape and mud for walls and ceilings.
- Flooring CalculatorBoxes of plank flooring or square yards of carpet.
- Siding CalculatorSquares of siding plus corners, starter and J-channel.
- Insulation CalculatorTarget R-value by zone, R to add, bags and depth.
Land & area All land & area
Pools All pools
How these calculators are built
Every constant comes from a published source: bag yields from the manufacturer's data sheet, stair limits from the International Residential Code, densities from aggregate suppliers. Each page lists its sources and lets you change the assumptions, and every formula is tested against the worked example on its page. More about how we check them.