How to Use This Calculator

Calculate post load (roof, deck, or structure weight), select soil type from geotechnical report or local standards, and enter frost depth for your region. Calculator provides code-compliant footing size.

Why Accurate Concrete Footing Size Matters

Footing size must distribute loads based on soil bearing capacity and extend below frost depth to prevent heaving. Undersized footings cause settling; oversized waste concrete. Proper sizing ensures structural integrity.

Common Mistakes to Avoid

Not checking local frost depth, guessing soil capacity, insufficient depth causing frost heave, not using proper concrete mix, and poor soil preparation.

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