Home & Construction · 15 calculators
Construction and renovation costs, room and wall areas, square footage, flooring, paint, tile, bricks and concrete.
Home & Construction
Total build cost from area and cost per square metre, broken down by trade with a contingency.
total = area × rate + fees + contingency
Also called building cost calculator · cost per square meter build
Home & Construction
Cost to build a house from its size, quality level and number of storeys, with a material split.
cost = area × storeys × rate + fit-out + …
Also called cost to build a house · home building cost
Home & Construction
Floor, wall and ceiling area of a room in one go — everything you need for a decorating order.
floor = l × w
Also called room size calculator · room square meters
Home & Construction
Square footage of a room, floor or plot, including multiple rooms and a waste allowance.
area = length × width × rooms × (1 + wast…
Also called sq ft calculator · square feet of a room
Home & Construction
Flooring packs, underlay and trim for a room, with waste allowance and total cost.
packs = area × (1 + waste) ÷ coverage per…
Also called how much flooring do i need · floor packs calculator
Home & Construction
Litres of paint for a room — walls, ceiling and woodwork — with coats, coverage and cost.
litres = area × coats ÷ coverage per litre
Also called how much paint do i need · paint quantity calculator
Home & Construction
Tiles, adhesive and grout for a floor or wall, with cutting waste and box counts.
tiles = area ÷ ((tile length + joint) × (…
Also called how many tiles do i need · tile quantity calculator
Home & Construction
Bricks needed for a wall, with mortar quantity, waste allowance and cost.
bricks = wall area ÷ (brick length + join…
Also called how many bricks do i need · brick quantity calculator
Home & Construction
Concrete volume for a slab, footing, column or post hole, with cement, sand, aggregate and bag counts.
Volume = length × width × depth (× π/4 × …
Also called concrete volume calculator · how much concrete do i need
Home & Construction
Cement bags needed for concrete, mortar or plaster from the volume and mix ratio.
cement = dry volume × (cement parts ÷ tot…
Also called how many bags of cement · cement bag calculator
Home & Construction
Sand needed for a slab, bedding layer, sandpit or mortar, in cubic metres, tonnes and bags.
Volume = area × depth
Also called how much sand do i need · sand quantity calculator
Home & Construction
Gravel, shingle or hardcore for a driveway or path, in cubic metres, tonnes and bulk bags.
tonnes = area × depth × bulk density ÷ 10…
Also called how much gravel do i need · driveway gravel calculator
Home & Construction
Total wall area of a room or elevation with doors and windows deducted.
net area = perimeter × height − openings
Also called wall square footage · surface area of walls
Home & Construction
Ceiling area and the paint, plasterboard or tiles needed to cover it.
area = length × width (÷ cos pitch for a …
Also called ceiling square meters · ceiling paint area
Home & Construction
Renovation budget by room and scope of work, with contingency and cost per square metre.
budget = area × rate + room fit-outs + co…
Also called remodel cost calculator · home renovation budget
| Construction Cost | total = area × rate + fees + contingency |
|---|---|
| House Construction Cost | cost = area × storeys × rate + fit-out + contingency |
| Room Area | floor = l × w · walls = perimeter × height − openings |
| Square Footage | area = length × width × rooms × (1 + waste) |
| Flooring | packs = area × (1 + waste) ÷ coverage per pack |
| Paint | litres = area × coats ÷ coverage per litre |
| Tile | tiles = area ÷ ((tile length + joint) × (tile width + joint)) |
| Brick | bricks = wall area ÷ (brick length + joint) × (brick height + joint) |
| Concrete | Volume = length × width × depth (× π/4 × d² for round) |
| Cement | cement = dry volume × (cement parts ÷ total parts) × 1440 kg/m³ |
Allow 8% for a straight layout, 12% for diagonal and up to 17% for herringbone, plus one spare pack for later repairs.
Typically 10–12 m² per litre per coat on a smooth sealed surface. Rough or porous walls can halve that.
Standard UK bricks at a 10 mm joint give 60 bricks per m² for a single skin, or 120 for a one-brick wall.
For a 1:1.5:3 (M20) mix, roughly 8 bags of 50 kg cement per cubic metre, plus 0.42 m³ sand and 0.84 m³ aggregate.