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Concrete calculator

The concrete for a slab or a foundation, in cubic metres and cubic yards, with the formwork and the materials under the slab.

Your dimensions

Units

Starting values: the basement slab of a 28' x 40' bungalow (inside 8" foundation walls).

ft
e.g. 38'-8", 40 or 11.8 m
ft
e.g. 26'-8", 28 or 8.1 m
in
e.g. 4, 5 or 100 mm
%
Added to the concrete only.

Results

Slab concrete
—

Rigid insulation
—

6 mil polyethylene
—

Wire mesh
—

How it's calculated

  • Slab concrete = length × width × thickness, + waste.
  • Footing concrete = wall length × footing width × footing thickness, + waste. Wall concrete = length × height × wall thickness, + waste.
  • Formwork: footing = length × thickness × 2 sides; wall = length × height × 2 faces.
  • Under the slab: rigid insulation = area; polyethylene and wire mesh = area + 10% overlap.
  • 1 cubic yard (cu. yd) = 0.7646 m³.

Measure once. The rest follows.

In KOR, this calculation happens on its own from your plans: measure the foundation or the slab once, and the concrete, formwork, rebar, anchor bolts and drain follow.

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