Concrete calculators

Volume, bags and ready-mix orders for slabs, footings, piers, post-holes and steps, then what the pour costs — quantities rounded up to what you buy, every constant sourced.

2 calculators live

Quantities

Concrete Slab CalculatorWork out the concrete a slab, footing, round pier, post-hole or set of steps needs — volume in cubic yards and cubic feet, 40/60/80 lb bag counts, and the ready-mix order.

Costs

Concrete Cost CalculatorEstimate what a concrete slab, driveway, patio or footing costs to pour — concrete per cubic yard, labour per square foot, gravel base, reinforcement and delivery fees, itemised from dated, sourced price bands.

How these calculators work

Every page computes in full precision and rounds once, at the point you buy — a whole bag, a whole block, a supplier's delivery increment. Each constant lists the data sheet or standard it came from and the date it was checked, and each page's worked examples run in the test suite and on the page itself.

Also on this site: Masonry · Reinforcement