Concrete & Masonry Calculators
Estimate concrete, bricks and other masonry materials for slabs, patios, footings, walls and post holes. Every calculator shows the formula and a worked example so you can check the math.
- Brick CalculatorWork out how many bricks you need for a wall, a planter or a veneer.
- Concrete CalculatorWork out how much concrete you need for a slab, patio, footing or post holes.
- Rebar CalculatorPlan the rebar grid for a concrete slab, patio or footing pad.
Popular questions
Order a little extra
Concrete and masonry jobs almost always need more material than the exact volume. Add 5–10% for spillage, uneven ground and breakage — running short halfway through a pour is far more expensive than a few spare bags.
Bags or ready-mix?
Premix bags are practical up to about one cubic yard. Beyond that, a ready-mix truck is usually cheaper, faster and gives a more consistent slab.