About the Concrete Wall Calculator
Concrete for a poured wall, with formwork area, openings deducted and the bag count.
Also known as: poured wall concrete, retaining wall concrete, wall pour volume.
How to use this calculator
- Enter wall length, wall height, wall thickness, openings area and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
Volume = (length × height − openings) × thickness
Worked example
Using the values pre-filled in the calculator above:
- Wall length = 10 m
- Wall height = 2.4 m
- Wall thickness = 200 mm
- Openings area = 0 m²
- Mix ratio: 1 : 1.5 : 3 (M20) — 20 MPa — slabs and footings
- Waste allowance = 6 %
the calculator returns:
- Concrete required: 5.088 m³
- Wall face area: 24 m²
- Formwork (both faces): 48 m²
- Cement bags (50 kg): 42