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    CalculatorsHome ImprovementConcrete Slab, Footing & Sonotube Calculator

    Concrete Slab, Footing & Sonotube Calculator

    Calculate ready-mix cubic yards, 80-lb pre-mix bags, rebar grid, and crushed gravel for slabs and footings.

    Calculate
    Concrete Slab, Footing & Sonotube Calculator
    Calculate cubic yards, ready-mix truck delivery, 80-lb/60-lb pre-mix bags, rebar grid steel, gravel sub-base, and formwork lumber for patios, driveways, shed foundations, and post piers.
    1. Slab Configuration & Dimensions
    Choose standard application presets or define custom slab dimensions.

    Outdoor patio or small storage shed slab with welded wire mesh.

    Rectangular Slabs & Pads

    Add main slab, patio extension, steps, or apron.

    Cylindrical Sonotube Post Piers / Footings

    Round foundation tubes for deck posts, pergolas, and fence corner posts.

    Standard 10% for uneven subgrade and form deflection.

    2. Sub-Base, Formwork & Delivery Method
    Configure gravel bed depth, forming perimeter, and ready-mix truck vs bag mix.

    #57 Stone subgrade

    Moisture retardation

    2x4/2x6 perimeter lumber

    Standard is 4" compacted crushed stone.

    National average ≈ $140 - $160 / cu yd

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