How much concrete for a wall?
Wall concrete volume uses wall length, wall height, and wall thickness. Convert thickness from inches to feet, multiply the dimensions, then divide by 27 for cubic yards.
Openings, footings, and returns
Openings are not automatically subtracted. Footings, caps, returns, piers, steps, and thickened sections should be estimated separately when their dimensions differ.
Wall volume is not wall design
This calculator estimates quantity only. Retaining walls and structural walls require qualified design guidance for reinforcement, drainage, footing, and soil conditions.
Common concrete slab sizes
Cubic yards below are before waste. Add your project waste percentage before ordering.
| Slab size | 4 in thick | 5 in thick | 6 in thick |
|---|---|---|---|
| 10 ft x 10 ft | 1.23 cu yd | 1.54 cu yd | 1.85 cu yd |
| 10 ft x 12 ft | 1.48 cu yd | 1.85 cu yd | 2.22 cu yd |
| 12 ft x 12 ft | 1.78 cu yd | 2.22 cu yd | 2.67 cu yd |
| 20 ft x 20 ft | 4.94 cu yd | 6.17 cu yd | 7.41 cu yd |
| 24 ft x 24 ft | 7.11 cu yd | 8.89 cu yd | 10.67 cu yd |
| 30 ft x 40 ft | 14.81 cu yd | 18.52 cu yd | 22.22 cu yd |
Before you calculate
- Measure the actual formed length and width in feet.
- Enter slab thickness in inches, then handle thickened edges or footings as separate estimates.
- Break irregular slabs into rectangles so the volume calculation stays transparent.
Common mistakes
- Using square feet without converting thickness into volume.
- Missing thickened edges, turndowns, steps, or separate pads.
- Ordering exactly the calculated amount with no allowance for site variation.
Formula
cubic yards = (length * width * (thickness / 12) / 27) * (1 + wastePercent / 100)
Assumptions
- Concrete quantity is a planning estimate, not structural design.
- Thickness, forms, subgrade, reinforcement, drainage, slopes, and local requirements should be checked separately.
- Round ready-mix, bags, forms, sealers, and accessories up before ordering.
Example
Estimated concrete needed (cubic yards): 0.98 cubic yards
How to use this calculator
- Enter length in ft.
- Enter width in ft.
- Enter thickness in in.
- Enter waste in %.
- Review the live estimate and compare it with the example result.
- Check the formula, assumptions, product labels, and site conditions before using the Outdoor Storage Garage Wall Battery Charging Shelf Concrete Pad Calculator result to plan materials.
Before you buy materials
- Compare cubic yards, cubic feet, and bag counts before deciding between ready-mix and bags.
- Confirm final slab details with plans, product labels, or a qualified professional when accuracy matters.
FAQ
What is the example outdoor storage garage wall battery charging shelf concrete pad cubic-yard result?
Use length, width, thickness or depth, and waste, then calculate the planning result. In the default example, the result is 0.98 cubic yards.
How do I calculate concrete for a wall?
Use cubic yards = length x height x (thickness / 12) / 27, then add waste if needed.
Should I subtract windows or openings?
For planning, you can subtract large openings separately, but be careful not to under-order. This calculator does not automatically subtract openings.
Are footings included in wall volume?
No. Footings and thickened bases should be calculated separately because they use different dimensions.
Can this design a retaining wall?
No. It estimates concrete volume only. Retaining wall design needs qualified structural and drainage guidance.
Related calculators
This calculator is for planning estimates only. Verify final quantities with product labels, project conditions, and a qualified professional when accuracy matters.