When to use this: at takeoff, when you need a fast cubic-yard or 80 lb bag count for a slab, footing, or round column. Pick the shape, enter dimensions in the units the architect drew them in, and the calculator handles the conversion to cubic yards plus a default 10% waste allowance for spillage and over-pour.

Tools we used or recommend for this work: a magnesium screed (Marshalltown 14 in), a bull float, a Quikrete or Sakrete 80 lb mix bag if you came in under 1 cu yd (otherwise a ready-mix order), and rebar stakes if this is a slab. Links may be affiliate-tagged where the brand has a program.

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