Concrete & aggregate
Slabs, driveways, paths and footings. Order by the yard, the ton or the bag.
These all start the same way — an area multiplied by a depth — and differ in the unit the answer needs to be in, because that is set by how the material is sold rather than by the maths.
Concrete is ordered by the cubic yard or by the bag. Aggregate — gravel, crushed stone, sand, asphalt — is quoted and delivered by the ton, so those tools convert volume to weight and lead with the tonnage. Densities shift with moisture, which is why the weight is always an estimate to order against rather than a promise.
- Asphalt Tonnage for a driveway or car park, by area and compacted depth.
- Concrete bags How many bags of pre-mixed concrete a pour takes, in 40, 50, 60 or 80lb bags.
- Concrete slab Work out how much concrete a slab needs, in cubic yards, cubic metres or bags.
- Footings & columns Concrete for a strip footing or a set of round piers, by the yard and by the bag.
- Gravel How much gravel or crushed stone an area needs, by the ton and by the yard.
- Sand How much sand a paver base, sandbox or bedding layer needs, by weight and volume.