How Much Concrete for a 10-Inch Round Footing 24 Inches Deep?
Concrete estimate for a 10-inch diameter × 24-inch deep round Sonotube footing — cu ft, cu yd, and bag counts
Volume and bag counts for a 10 inch round footing 24 deep. Exact volume 1.0908 cu ft (0.0404 yd3) and planning numbers with 10% waste plus 40/60/80-lb bag counts.
This is a narrow, tube-form footing sized 10" diameter × 24" deep. It’s a small, cylindrical pour used where a single isolated post or a tight layout requires a slim round footing.
At 24" deep you’ll dig to that depth, set the 10" sonotube, and plan material by volume. Keep in mind site-specific requirements for load, soil bearing, frost, and reinforcement before final decisions.
Quick Answer
Exact volume: 1.0908 cubic feet (0.0404 yd3).
With 10% waste for planning: 1.1999 cubic feet (0.0444 yd3). Exact bag counts: 40-lb bags = 4, 60-lb bags = 3, 80-lb bags = 2. Planning bag counts with 10% waste: 40-lb = 4, 60-lb = 3, 80-lb = 2.
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How to Use This Footing Estimate
Quick steps to estimate and order concrete for this 10" × 24" round footing.
- Confirm the tube diameter is 10" and depth is 24" at the job.
- Use the exact volume 1.0908 cu ft to verify your math before adding waste.
- Add a 10% waste allowance: planning volume 1.1999 cu ft (0.0444 yd3).
- Decide material: bags of concrete mix for single pours, ready-mix for several footings.
- Multiply volumes and bags if you have multiple footings and round up whole bags when ordering.
- Record total bags and delivery or pickup time so material arrives when you’re ready to pour.
Formula
Use this round footing formula:
Volume (ft³) = π × Radius (ft) × Radius (ft) × Depth (ft)
3.1416 × 0.42 × 0.42 × 2 = 1.09 ft³
1.09 ÷ 27 = 0.04 yd³
If you add a 10% waste allowance, you should plan closer to 0.04 cubic yards.
Worked Example
Single-footing example: one 10" × 24" footing is 1.0908 cu ft (0.0404 yd3) before waste; with 10% waste plan on 1.1999 cu ft (0.0444 yd3).
Multiple-footing example: three identical footings total 3.2724 cu ft (0.1212 yd3) before waste; with 10% waste total 3.5997 cu ft (0.1332 yd3). Bag totals for three footings: exact = twelve 40-lb bags (or nine 60-lb, or six 80-lb). Planning with waste = twelve 40-lb bags (or nine 60-lb, or six 80-lb).
Bag Count Estimate
- 2 bags of 80 lb concrete mix
- 3 bags of 60 lb concrete mix
- 4 bags of 40 lb concrete mix
Always verify the actual yield on the product label before buying materials.
When Bagged Concrete vs Ready-Mix Makes Sense
For a single 10" × 24" footing, bagged concrete is usually simpler: you can buy 4 40-lb bags (or 3 60-lb or 2 80-lb) and mix what you need on site. It avoids minimum truck loads and scheduling for a very small volume.
When you have several footings the total yardage adds up fast. If the combined planned volume approaches a few tenths of a cubic yard, a small readymix delivery can be faster and cleaner than mixing many bags; for just one or two footings, bags are typically more practical.
Common Uses for This Footing Size
This 10" diameter × 24" deep round footing fits narrow, isolated supports: pergola posts, deck posts in a tight layout, small sign posts, or other places where a slim cylindrical footing footprint is required. It suits layouts where keeping the footing diameter small is part of the plan.
Limits depend on load, soil bearing capacity, frost depth, and whether reinforcement is needed. In higher loads or colder frost zones you might need a larger footing, deeper embedment, or added steel. Confirm those project-specific factors before relying on this size.
Common Mistakes to Avoid
Common estimating and planning oversights to avoid:
- Ordering material based on diameter only and forgetting the full 24" depth.
- Using rounded volumes too early; do exact math first, then add waste.
- Confusing exact bag counts with waste-adjusted planning counts.
- Failing to multiply bags correctly when ordering multiple footings.
- Not allowing for a whole-bag purchase — you can’t buy fractional bags.
- Ignoring reinforcement needs or the specified embedment for the post base during layout.
Frequently Asked Questions
What is the exact concrete volume for a single 10-inch round, 24-inch deep footing?
The exact volume is 1.0908 cubic feet, which equals 0.0404 cubic yards.
How many bags of concrete mix do I need for one footing?
Exact bag counts: 4 of the 40-lb bags, 3 of the 60-lb bags, or 2 of the 80-lb bags for one footing.
How much extra should I order for waste?
Use a 10% waste allowance here. That raises the planning volume to 1.1999 cu ft (0.0444 yd3) and leaves the planning bag counts the same as the exact counts in this case.
Will this footing size work for a deck or pergola post?
A 10" × 24" footing is sometimes used for isolated post supports and narrow layouts, but adequacy depends on the post load, soil bearing, frost depth, and required reinforcement. Evaluate those factors before deciding.
Keep Planning Your Concrete Project
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Disclaimer: This page provides planning estimates only. Actual concrete needs vary with excavation accuracy, site conditions, local code requirements, bag yield, and supplier guidance. Always verify measurements before buying materials, and consult a qualified professional for structural or code-sensitive work.