Concrete Footing Calculator
Estimate concrete for round or rectangular footings and piers.
Use this concrete footing calculator to estimate the concrete needed for round or rectangular footings and piers. It calculates volume from the footing dimensions and quantity after converting all measurements to feet. Results can help you determine the required cubic feet or cubic yards of concrete and estimate pre-mix bags for common projects.
Cubic yards
0.349
9.42 ft³ total
80 lb bags
16
pre-mix
60 lb bags
21
pre-mix
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Recommended tools & materials
Handy picks for this project on Amazon.
Quikrete Concrete Mix (80 lb)
Standard high-strength bagged mix
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Concrete Mixing Tub
Mix bags by hand without a mixer
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Magnesium Bull Float
Smooth and level fresh slabs
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Concrete Edger & Groover Set
Clean edges and control joints
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How does the concrete footing calculator work?
Round footing volume = π × radius² × depth. Rectangular = L × W × D. All dimensions converted to feet, then multiplied by the number of footings.
Formula: ft³ = π × (D/24)² × depth/12 (round)
What else do people ask about this calculator?
How much concrete for a 12 in Sonotube footing?
A 12 in diameter tube × 36 in deep uses about 2.36 ft³ (0.087 yd³), or roughly 4 bags of 80 lb pre-mix.
How deep should a footing be?
Below the frost line — typically 24–48 in depending on your climate zone. Check your local code.
Which related calculators should I use next?
Where can I learn more about these materials?
Weights, coverage, types and buying tips for the materials this calculator estimates.
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Complete Your Concrete Footing Project
These tools help you form, mix, place, and finish concrete footings more efficiently.
Quikrete 12-Inch QUIK-TUBE
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Edward Tools Magnesium Float
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MARSHALLTOWN Concrete Groover
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Paid links: as an Amazon Associate, MaterialCalc earns from qualifying purchases.