Strip Footing Calculator — m to m³, bags, cost
How to use this calculator
Select the footing layout — straight run, L-shape (2 sides), U-shape (3 sides), or full rectangle perimeter. Enter each segment length and choose the unit (m, cm, or mm) from the dropdown. Set the footing width and depth, then adjust waste allowance. Results update instantly.
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 — longitudinal rebar Ø10–Ø16 (B500B) running lengthwise, plus optional stirrups/ties per EN 1992-1-1, with lap splices at 40db (§8.7).
Labor — rate per linear meter, per m³, or a flat price. Grand total sums all active sections.
Saved Calculations
| Time | Layout | Length | Vol m³ | Cost | Rebar | Rebar | Labor | Total |
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How to Calculate Concrete for a Strip Footing (Metric)
This strip footing calculator estimates concrete volume in cubic meters, number of pre-mixed bags (25 kg and 50 kg), total weight in kilograms, material cost, reinforcement requirements, and labor expenses for continuous footings. A strip footing (also called a continuous footing or wall footing) runs beneath load-bearing walls and distributes the structural load to the ground. Enter dimensions and choose the unit (m, cm, or mm) from the dropdown, set the width (standard: 30 cm for light loads, 40–60 cm for heavy), and the depth (minimum 20 cm, typically below the frost line).
Formulas
Volume: V = Length × Width × Depth. For a rectangle perimeter, total length = 2 × (L + W). A 50-kg bag covers ≈ 0.024 m³; a 25-kg bag covers ≈ 0.012 m³. Concrete density is 2,400 kg/m³.
Reinforcement per EN 1992-1-1 (Eurocode 2)
Strip footings require longitudinal rebar (Ø10–Ø16 B500B) running the full length, with lap splices at 40db per EN 1992-1-1 §8.7. Standard 6-m bars are used. Stirrups (Ø6 ties) are placed at 150–300 mm on center. Minimum concrete cover for footings is 40–75 mm depending on exposure class (EN 1992-1-1 §4.4.1). For footings cast directly against soil without blinding concrete, 75 mm cover is required.
FAQ
How wide should a strip footing be? Typically twice the wall width. For a standard 20 cm block wall, use a 40 cm wide footing. For light residential loads on good soil, 30 cm may suffice.
How deep should a strip footing be? Minimum 20 cm depth, but must extend below the frost line (60–120 cm in northern Europe). The footing depth refers to the concrete thickness, not trench depth.
Do I need rebar in a strip footing? Yes. Eurocode 2 requires minimum reinforcement. Two Ø12 bars running lengthwise is the most common configuration for residential footings, with Ø6 stirrups at 200 mm spacing.
