Concrete Wall Calculator — m, cm to m³, bags, cost
How to use this calculator
Choose a wall configuration — single wall, L-shape (2 walls), U-shape (3 walls), or rectangle (4 walls). Enter length, height, and thickness using the unit dropdown (m, cm, or mm). Subtract window and door openings. Results update instantly with volume, weight, formwork area, and an interactive diagram.
Cost — pick ready-mix delivery per m³, 50 kg bags, or 25 kg bags. Select your currency (EUR, PLN, CZK, SEK, etc.) in the settings below.
Reinforcement — horizontal and vertical rebar diameters 8-20 mm with spacing 100-300 mm per EN 1992-1-1 (Eurocode 2), including lap splices.
Labor — rate per m² of formwork (contact area), per m³, or flat price. Grand total sums all active sections.
Saved Calculations
| Time | Config | Length | Vol m³ | Concrete | Rebar | Rebar cost | Labor | Total |
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How to Calculate Concrete for a Poured Wall
This concrete wall calculator estimates volume in cubic meters, number of pre-mixed bags (25 kg and 50 kg), total weight, formwork area, material cost, reinforcement requirements, and labor expenses for poured concrete walls. Choose from single wall, L-shape (2 walls), U-shape (3 walls), or rectangular (4 walls) configurations. Enter dimensions in meters, centimeters, or millimeters, set wall thickness (standard: 20 cm for foundations, 25-30 cm for retaining walls), subtract door and window openings, and adjust waste allowance.
Wall Volume Formula
Wall Volume = Total Wall Length x Height x Thickness - (Number of Openings x Opening Width x Opening Height x Thickness). Concrete density is approximately 2 400 kg/m³. Formwork area equals wall surface area on both sides (2 x Length x Height), which determines forming material and labor needs.
Reinforcement per Eurocode 2 (EN 1992-1-1)
Walls require both horizontal and vertical reinforcement. Eurocode 2 clause 9.6 requires minimum steel ratio of 0.002 of the cross-section area for vertical bars and 25% of vertical or 0.001 for horizontal bars. Typical residential walls use diameters 10 or 12 mm at 200 mm spacing. The calculator accounts for lap splices at 40 bar diameters, cutting waste, and standard 6 m bar lengths.
Cost Estimation
Compare ready-mix delivery per cubic meter against bagged concrete (50 kg ~ 0.024 m³, 25 kg ~ 0.012 m³). Walls are more labor-intensive than slabs due to formwork construction. Typical forming + pouring labor runs 25-50 per m² of contact area (both sides). The grand total combines concrete, rebar, and labor when multiple sections are active.
FAQ
How thick should a concrete wall be? Foundation walls: 20 cm minimum for single-storey; 25 cm for two-storey buildings; 30 cm for retaining walls over 2.5 m retained height, per Eurocode 2 and local building codes.
How much concrete do I need for a basement wall? A typical 10 m x 6 m basement with 2.4 m high, 20 cm thick walls requires approximately 32 m of perimeter x 2.4 m x 0.2 m = ~15.4 m³ before waste.
