Building & Construction
Free calculators for concrete, gravel, soil, paint, tiles, flooring, bricks and pavers: quantities, bags and packs in US, UK and Australian sizes.
49 free tools
Walls, floors & finishes
Paint Calculator
How much paint you need for a room: walls and ceilings less doors and windows, any number of coats, in gallons or litres, and which tins to buy.
Drywall & Plasterboard Calculator
How many sheets of drywall or plasterboard you need for walls and ceilings: 4 × 8, 4 × 12 ft or 2400 × 1200 mm boards, with openings taken off.
Wallpaper Calculator
How many rolls of wallpaper you need, worked out by drops: room size, wall height, roll size and pattern repeat (straight or half-drop match).
Tile Calculator
How many tiles you need for a floor or wall: tile size, grout joint and extra for cuts, with boxes and cost, in inches or millimetres.
Grout Calculator
How much grout you need: tile size, joint width and depth, and the area give pounds or kilograms of grout and the number of bags.
Flooring Calculator
Flooring for one room or a whole floor: area in ft² or m², extra for straight, diagonal or herringbone layouts, packs to buy, underlay and cost.
Laminate Flooring Calculator
How much laminate flooring and underlay you need: room sizes, pack coverage and extra for cuts give the packs and rolls to buy, and the cost.
Carpet Calculator
Carpet worked out the way it's cut, in strips off a 12 or 15 ft (or 4 or 5 m) roll: length off the roll, square yards or m² to buy, seams and underlay.
Baseboard & Skirting Board Calculator
How much baseboard or skirting board you need: room perimeters less doorways, extra for joints, and the number of 8, 12 or 16 ft (or 2.4 to 5.4 m) lengths.
Siding Calculator
Siding or cladding for walls and gable ends, less doors and windows: squares, boxes, linear feet and the number of boards or panels at your exposure.
Epoxy Calculator
How much epoxy resin you need for a river table, mould or floor coating: volume in gallons, fl oz or litres, split into resin and hardener.
Gravel, stone & sand
Gravel Calculator
How much gravel you need for a driveway, path or border: cubic yards or m³, tons or tonnes, and bags, for rectangles, circles and triangles.
Pea Gravel Calculator
Pea gravel (pea shingle) for paths, patios and play areas: enter the area and depth to get cubic yards or m³, tons or tonnes and bags.
Crushed Stone Calculator
Crushed stone or crushed rock for driveways, bases and drainage: volume in cubic yards or m³, weight in tons or tonnes, and bulk bags.
River Rock Calculator
River rock for beds, dry creek beds and drainage: cubic yards or m³, tons or tonnes, and bags for any mix of rectangles, circles and triangles.
Landscape Rock Calculator
Landscape rock, pebbles and decorative stone: work out the volume and weight for your beds, plus bags or bulk tons, with an editable density.
Decomposed Granite Calculator
Decomposed granite (DG) for paths and patios: volume and tons for your area and depth, with extra built in for the way DG compacts.
Crushed Limestone Calculator
Crushed limestone for driveways, paths and bases: cubic yards or m³ and tons or tonnes for your area and depth, plus bag and bulk counts.
Aggregate Calculator
Aggregate for concrete, drainage and bases: tonnes or tons and m³ or cubic yards, with 25 kg bags and 850 kg bulk bags counted for you.
Ballast Calculator
All-in ballast for mixing concrete: tonnes and m³ for your area and depth, and how many 25 kg or 850 kg bulk bags to order.
Sand Calculator
Sand for paver bedding, sandpits and mixing: cubic yards or m³, tons or tonnes, and 50 lb, 20 kg, 25 kg or bulk bags for your area and depth.
Concrete & cement
Concrete Calculator
Work out how much concrete you need in cubic yards or m³ for slabs, footings, columns, post holes and steps, plus how many 40–80 lb or 20–30 kg bags.
Concrete Slab Calculator
Concrete for a patio, shed base or driveway slab: enter length, width and thickness to get cubic yards, m³, weight and the number of premixed bags.
Concrete Footing Calculator
Concrete volume for strip and pad footings: length, width and depth in feet and inches or metres and millimetres, with bag counts and weight.
Sonotube Calculator: Concrete for Round Columns
Concrete for round tube forms and columns: pick a diameter from 6 to 24 inches (150–600 mm), set the height and count, and get volume and bags.
Concrete Bag Calculator: How Many Bags?
How many bags of premixed concrete you need: 40, 50, 60 and 80 lb or 20, 25 and 30 kg bags side by side, for any slab, hole, column or step.
Fence Post Concrete Calculator
Concrete for fence and deck post holes: hole size, depth, post size and number of posts give the bags you need, with the post's own volume taken off.
Cement Calculator: Cement, Sand & Aggregate
Mixing your own concrete or mortar? Get the cement bags, sand, gravel and water for 1:2:3, 1:2:4, 1:3 or 1:4 mixes, from dimensions or a volume.
Soil, mulch & lawn
Topsoil Calculator
Topsoil for new lawns, beds and levelling: cubic yards or m³, the weight, and how many 0.75–1.5 cu ft or 25–50 L bags or bulk bags you need.
Soil Calculator for Raised Beds & Gardens
Soil for raised beds, planters and garden beds: enter each bed's size and depth to get cubic feet, cubic yards or litres and m³, and the bags to buy.
Dirt Calculator (Fill Dirt)
Fill dirt for levelling, holes and raising ground: cubic yards or m³ and tons or tonnes, with extra for settling and compaction built in.
Mulch Calculator
How much mulch you need: cubic yards or m³ for your beds at 2–4 inches (50–100 mm) deep, and how many 2 or 3 cu ft or 50–70 L bags.
Bark Chippings Calculator
Bark chippings or bark mulch for borders and play areas: litres and m³ (or cubic feet and yards) for your area, and the bags or bulk bags to buy.
Sod & Turf Calculator
How much sod or turf you need for a new lawn: area of each part of the yard, extra for edges, and the slabs, rolls and pallets to order.
Artificial Grass Calculator
Artificial grass worked out in strips off a 2 or 4 m (or 15 ft) roll: length to buy, square metres or feet, seams, joining tape and infill.
Paving & sub-base
Asphalt Calculator
Asphalt tonnage for driveways and patching: area and compacted thickness give tons or tonnes at 145 lb per cubic foot, with an optional price per ton.
Crusher Run Calculator
Crusher run for driveway and patio bases: compacted depth and area give tons and cubic yards, with 20% extra for compaction by default.
Road Base Calculator
Road base for driveways, paver bases and slabs: tonnes and m³ (or tons and cubic yards) for your area, with extra for compaction built in.
MOT Type 1 Calculator
MOT Type 1 sub-base for patios, paths and driveways: tonnes for your area and depth, and how many 25 kg or 850 kg bulk bags to order.
Crusher Dust Calculator
Crusher dust for paver bedding and fine bases: tonnes and m³ for your area at 30–50 mm deep, with 20 kg bags or bulk tonnes counted.
Area, volume & weight
Cubic Yard Calculator
Cubic yards from feet and inches for any area: rectangles, circles and triangles added together, with cubic feet and m³ and an optional weight.
Cubic Metre Calculator (m³)
Cubic metres from metres and millimetres for any area: rectangles, circles and triangles added together, in m³ and litres with an optional weight.
Tonnage Calculator: Tons of Gravel, Stone & Soil
Convert an area and depth to tons or tonnes of gravel, stone, sand, soil, asphalt and more, using an editable density for each material.
Square Footage Calculator
Square feet of a room, house or yard: rectangles, circles and triangles added together, feet and inches accepted, with m², square yards, acres and cost.
Square Metre Calculator
Square metres of a room, garden or plot: rectangles, circles and triangles added together, with square feet, hectares, acres and cost per m².
Bricks, blocks & paving
Brick Calculator
How many bricks you need for a wall, single or double skin, with US, UK or Australian brick sizes, plus the mortar, cement bags and sand.
Concrete Block Calculator
How many concrete blocks you need: 8 × 8 × 16 in CMU, UK 440 × 215 mm or Australian 390 × 190 mm blocks, with mortar, cement and sand.
Mortar Calculator
Cement and sand for mortar, render or screed at 1:3 to 1:6: bags of cement, sand by weight and water, from a volume or the size of the job.
Paver Calculator
How many pavers you need for a patio, path or driveway, plus the compacted base and bedding sand in tons or tonnes, for common paver and slab sizes.