Spread (Pad) Footing Calculator — m, m³, cost
How to use this calculator
Select a footing shape (square, rectangular, or circular), enter dimensions with unit selector (m, cm, or mm), then set depth and number of footings. Optionally add a pedestal/column stub on top. Results update instantly with volume, weight, bags, and rebar.
Cost — choose ready-mix per m³, 50 kg bags, or 25 kg bags. Select currency.
Reinforcement — bottom mat rebar in both directions per EN 1992-1-1 (Eurocode 2), bar size and spacing.
Labor — rate per footing, per m³, or flat price.
Saved Calculations
| Time | Shape | Qty | Vol m³ | Weight | Cost |
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How to Calculate Concrete for Spread Footings (Metric)
A spread (pad) footing distributes the column or post load over a wider area of soil. This calculator computes concrete volume for square, rectangular, or circular footings with an optional pedestal/column stub. Enter dimensions in metres, centimetres, or millimetres, set footing depth (standard: 30 cm for light loads, 45–60 cm for heavy-duty), number of footings, and waste allowance.
Footing Volume Formulas
Square: V = side² × depth. Rectangular: V = length × width × depth. Circular: V = π × (d/2)² × depth. Pedestal volume is added on top. Concrete density is 2 400 kg/m³.
Reinforcement per EN 1992-1-1
Bottom mat rebar is placed in both directions with 50 mm minimum cover for footings cast against soil. Bar sizes from Ø8 to Ø20 mm with spacing 100–300 mm. Standard bar length is 6 m or 12 m.
FAQ
How deep should a spread footing be? Minimum 300 mm for residential, 450–600 mm for commercial. The depth must extend below the frost line per local regulations.
What size footing do I need? Footing size depends on the column load and soil bearing capacity. A structural engineer should size footings for load-bearing applications per EN 1997-1 (Eurocode 7).
