Concrete & Construction Calculators
Free, practical tools for concrete and construction planning — estimate concrete volume and bags, work out a mix ratio, count rebar, blocks, and bricks, and price a slab before you pour.
Concrete Volume Calculator
Estimate the concrete volume of a slab, footing, or column in cubic feet, cubic yards, and cubic metres from its dimensions, with a 10% waste allowance for ordering
Concrete Bag Calculator
Work out how many 40, 60, or 80 lb bags of pre-mixed concrete you need for a given volume, including a 5% waste allowance and rounded up to whole bags
Concrete Mix Ratio Calculator
Break a concrete volume into cement, sand, and aggregate quantities for any mix ratio, applying a dry-volume factor and converting cement into bags
Rebar Calculator
Estimate the number of reinforcing bars and total bar length for a two-way slab mat from the slab dimensions, bar spacing, and edge clearance
Block & Brick Calculator
Estimate how many concrete blocks or bricks a wall needs from its length and height, using the unit face area including mortar plus a wastage allowance
Slab Cost Calculator
Estimate the cost of a concrete slab from its dimensions and unit prices for ready-mix concrete, labor, and formwork, broken down and totalled