basic

Concrete Volume for Slab or Footing Calculator

Cubic metres and bags of concrete for any pour.

Calculates concrete volume = length × width × depth (m³), weight ≈ 2400 kg/m³, and number of 20 kg or 25 kg bags needed, plus a 10% waste allowance.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

m
m
m
kg

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Volume = L × W × D; bags = Volume × 2400 / bag_kg × 1.1

In depth

Calculates concrete volume = length × width × depth (m³), weight ≈ 2400 kg/m³, and number of 20 kg or 25 kg bags needed, plus a 10% waste allowance.