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Concrete Volume Calculator

Estimate concrete for a rectangular slab, with waste allowance.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Slab volume = length × width × thickness in metres. Waste is an editable allowance. Does not determine mix, reinforcement, load capacity or structural safety.

How to use it (step by step)

  1. 1Fill in the boxes: “Length (m)”, “Width (m)”, “Thickness (cm)”, “Waste allowance (%)”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Area / volume / perimeter
Perimeter = distance around a shape. Area = the flat space inside it (m²). Volume = the space inside a 3D object (m³).
Percentage
A part out of 100. 25% of 200 = 50.
Struct / class / schema
A description of the shape of data: which fields it has and what type each one is (text, number, list…).

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