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Concrete Footing Calculator

Estimate concrete cubic yards, cubic feet, and bags for continuous footings and trench footings.

Concrete Footing Calculator
✓ Your estimate
Estimated concrete needed
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cubic yards
Switch display unit only.
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Cubic feet
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Cubic yards
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Bags
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Calculate first to see unit conversions.

What this estimate includes

This estimate shows concrete volume for a straight continuous footing, plus bag count when using bagged concrete.

How it’s calculated

Volume = length × width × depth
Adjusted volume = volume × waste %
Cubic yards = cubic feet ÷ 27
Bags = adjusted cubic feet ÷ bag yield, rounded up

Before you order

Footing sizes are often controlled by local code, soil conditions, frost depth, and structural loads. Confirm dimensions before ordering concrete.

Frequently Asked Questions

Should footing concrete be ordered by cubic yards or bags?
Large continuous footings are usually planned in cubic yards. Small repairs and short footings may use bagged concrete.
Does this calculator include rebar?
No. It estimates concrete volume only.
Why add waste?
Waste covers over-excavation, uneven trench bottoms, spillage, and small measurement differences.
Disclaimer: This calculator provides estimates only. Actual quantities depend on product coverage, jobsite conditions, waste, and supplier details. Verify all quantities before ordering. See all outdoor material calculators.