Home & Construction · 14 calculators
Concrete for slabs, footings, columns and walls, cement, sand and aggregate quantities, bricks, blocks, mortar and pavers.
Concrete & Masonry
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
Concrete & Masonry
Concrete, mesh and formwork for a floor slab, driveway or patio, with the bag count and cost.
Volume = area × thickness × (1 + waste)
Also called slab concrete calculator · driveway concrete
Concrete & Masonry
Concrete for strip or pad footings, including multiple footings and the total excavation volume.
Volume = length × width × depth × number …
Also called strip footing calculator · pad footing concrete
Concrete & Masonry
Concrete for round or rectangular columns and piers, with formwork area and rebar estimate.
Volume = cross-sectional area × height × …
Also called column concrete volume · pier concrete
Concrete & Masonry
Concrete for a poured wall, with formwork area, openings deducted and the bag count.
Volume = (length × height − openings) × t…
Also called poured wall concrete · retaining wall concrete
Concrete & Masonry
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
Concrete & Masonry
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
Concrete & Masonry
Coarse aggregate for concrete or a sub-base, by volume, weight and bulk bag count.
aggregate volume = dry volume × aggregate…
Also called ballast calculator · coarse aggregate quantity
Concrete & Masonry
Cement, sand, aggregate and water for any mix ratio and volume, by weight and by bag.
dry volume = wet × 1.54, then split by th…
Also called mix ratio calculator · cement sand aggregate ratio
Concrete & Masonry
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
Concrete & Masonry
Blocks needed for a wall with mortar, waste allowance and cost, for any block size.
blocks = net wall area ÷ block face area …
Also called cinder block calculator · how many blocks
Concrete & Masonry
Mortar volume, cement and sand for brickwork, blockwork or pointing at any mix ratio.
dry volume = wet × 1.33, split 1 : n betw…
Also called mortar mix calculator · sand and cement mortar
Concrete & Masonry
Pavers, bedding sand and jointing sand for a patio, path or driveway.
pavers = area ÷ (paver length + joint) × …
Also called patio paver calculator · how many pavers
Concrete & Masonry
Natural stone or rockery stone for a wall or ground cover, by weight and volume.
tonnes = volume × (1 − voids) × density ÷…
Also called stone wall calculator · rock calculator
| Concrete | Volume = length × width × depth (× π/4 × d² for round) |
|---|---|
| Concrete Slab | Volume = area × thickness × (1 + waste) |
| Concrete Footing | Volume = length × width × depth × number of footings |
| Concrete Column | Volume = cross-sectional area × height × number of columns |
| Concrete Wall | Volume = (length × height − openings) × thickness |
| Cement | cement = dry volume × (cement parts ÷ total parts) × 1440 kg/m³ |
| Sand | Volume = area × depth · tonnes = volume × density ÷ 1000 |
| Aggregate | aggregate volume = dry volume × aggregate parts ÷ total parts |
| Concrete Mix Ratio | dry volume = wet × 1.54, then split by the ratio parts |
| Brick | bricks = wall area ÷ (brick length + joint) × (brick height + joint) |
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.
Dry materials lose volume when water fills the voids between particles. The 1.54 factor converts the wet volume you need into the dry materials to buy.
Standard UK bricks at a 10 mm joint give 60 bricks per m² for a single skin, or 120 for a one-brick wall.