Concrete Wall Calculator
Cubic yards and bags for a poured foundation or retaining wall — length, height and thickness.
Concrete wall calculator
Shape
Waste factor
Concrete needed (waste in)
5.43 yd³
146.7 ft³ · 4.15 m³
Bags (rounded up)
245
80 lb
326
60 lb
392
50 lb
489
40 lb
- Ready-mix (delivered)
- $739 – $1,207
- Bagged (80 lb)
- $1,348 – $2,205
- Installed (slab)
- $2,200 – $4,800
Concrete 5.43 yd³
Sizing a poured wall
A wall is a flat volume: length × height × thickness. Because walls are usually a full truck or more of concrete, ready-mix is almost always the way to go — the calculator prices it alongside the bag count.
Prices updated January 2026 National US averages · reviewed quarterly
Volumes use standard bag yields and a 10% waste allowance; costs are national US averages that vary by region, mix and finish. See our methodology for exactly how each figure is worked out, or check the reference sources:
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Frequently asked questions
How much concrete for a wall?
Wall volume is length × height × thickness. A 20 ft wall 8 ft tall and 8" thick needs about 4 cubic yards. Enter your wall above for the exact figure.
How thick is a poured concrete wall?
Residential foundation walls are commonly 8–10" thick; retaining walls vary with height and load. Follow an engineer or local code for structural walls.