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Calculators & guides

Concrete Wall Calculator

Estimate the volume of a poured concrete wall, stem wall or straight retaining wall.

Units

Geometry dimensions — schematic, not to scaleL (length)HT
Schematic · not to scale · quantity repeats the entire solid

Concrete & bag assumptions

Density is the placed concrete density, not dry bag weight. Defaults are examples for normal-weight concrete. Bag weight does not determine yield; use the mixed yield printed on your product.

Estimate cost (optional · USD)

All cost fields are optional and user-entered. Ready-mix and bags are alternatives, never added together. No average or local prices are assumed — use a real quote. Labor per area is available only for shapes with a defined footprint.

Formula & solid model

V = L × H × T × Q

All lengths convert to metres before calculation. Blank waste = 0%. Zero dimensions or quantity produce zero volume. Display values are rounded; costs and bags use unrounded volumes.

Wall · incl. 10% waste

You need approximately 2.173 cubic yards

58.667 ft³ · 1.661 m³ · 1,661.26 litres

Volume

UnitExact+10% waste
Cubic yards1.9752.173
Cubic feet53.33358.667
Cubic metres1.511.661
Litres1,510.2321,661.255

Placed weight · incl. waste

8,800 lb / 3,991.61 kg

Density: 150 lb/ft³ · weight = volume × density

Selected premix bags · incl. waste

98 × 80 lb bags

Yield: 0.6 ft³ / bag · total volume ÷ yield, rounded up.

Above about 1 yd³, ready-mix is often more practical than mixing bags.

Estimate inputs & formula

Length: 20 ft · Height: 4 ft · Thickness (T): 8 in · Quantity (Q): 1

V = L × H × T × Q

Estimate only, not engineering advice. Actual needs vary with subgrade, forms and spillage. Confirm final quantities and product yields with your supplier or contractor before ordering.

What this calculates

A straight wall is a rectangular prism: length × height × thickness. For L- or U-shaped walls, add each straight run separately, measured along the centerline.

Formula

Volume = length × height × thickness

Worked example

30 ft wall, 4 ft tall, 8 in thick

  1. 1.30 × 4 × 0.667 = 80 cu ft
  2. 2.80 ÷ 27 = 2.96 cu yd
  3. 3.Add 10%: about 3.26 cu yd

Common mistakes

  • Forgetting to subtract large openings such as windows or doors (or including them when they are small enough to ignore).
  • Not accounting for form bulging on tall pours, which can add volume.

Frequently asked questions

Does this include the footing?

No. Calculate the footing separately with the footing calculator and add both totals.

Can I use this for a retaining wall design?

Only for volume. Retaining walls carry soil loads and often require engineering; this tool does not check structural adequacy.