Basement Walls • Stem Walls • Poured Concrete Foundations
Use this Concrete Foundation Wall Calculator to estimate concrete volume for poured foundation walls, basement walls, stem walls and wall-plus-footing projects. Enter total wall length, wall height and wall thickness to calculate cubic feet, cubic yards, approximate bag quantities and optional ready-mix material cost.
Estimate wall concrete alone, wall plus footing, subtract openings or convert wall dimensions into bags and ready-mix cost.
Enter the total wall length, wall height and concrete thickness for a uniform rectangular wall section.
Use actual finished concrete dimensions. Pilasters, thickened sections, keyways, haunches and other non-uniform areas should be calculated separately.
Combine a uniform poured wall with a rectangular continuous footing for a single total concrete estimate.
This mode assumes a continuous footing running the same total length as the wall. Pads, piers and stepped footings should be calculated separately.
Calculate gross wall volume, then deduct one repeated opening size such as windows, doors or access openings.
Do not deduct small penetrations automatically. Whether an opening should be deducted for ordering depends on its actual size and project estimating practice.
Estimate concrete bags and ready-mix material cost from wall dimensions and an editable product yield.
Approx. 80 lb bag example; verify actual package yield.
The Concrete Foundation Wall Calculator converts wall dimensions into concrete volume. For a straight, uniform poured wall, measure the total wall length, finished wall height and wall thickness. The calculator multiplies those dimensions to determine cubic feet, then divides by 27 to convert the result to cubic yards.
For a basement or perimeter foundation, add all wall runs to get a total linear wall length. If wall sections have different heights or thicknesses, calculate them separately instead of averaging unlike sections. This produces a more reliable material estimate.
Add each wall run using a consistent measurement convention.
Use actual poured wall height from footing/top-of-wall dimensions.
Enter the concrete wall thickness shown on the design.
Use the combined calculator if the footing is also being estimated.
Check forms, plans, site conditions and supplier requirements.
A uniform poured foundation wall is a rectangular prism. Wall volume is therefore calculated from length × height × thickness. Because wall thickness is often shown in inches, convert it to feet before multiplying manually.
Cubic yards = cubic feet ÷ 27.
For example, an 80-foot-long wall that is 8 feet high and 8 inches thick contains about 426.67 cubic feet of concrete, or approximately 15.80 cubic yards before an ordering allowance.
The table below shows approximate wall volume for several common estimating examples before extra allowance.
| Wall Length | Wall Height | Thickness | Approx. ft³ | Approx. yd³ |
|---|---|---|---|---|
| 40 ft | 4 ft | 8 in | 106.67 | 3.95 |
| 60 ft | 8 ft | 8 in | 320.00 | 11.85 |
| 80 ft | 8 ft | 8 in | 426.67 | 15.80 |
| 100 ft | 8 ft | 10 in | 666.67 | 24.69 |
| 120 ft | 9 ft | 10 in | 900.00 | 33.33 |
Length, height and thickness are converted into total wall volume.
Combine a rectangular footing and poured wall in one estimate.
Subtract repeated door or window openings when appropriate.
Convert wall volume into cubic yards for supplier discussions.
The amount of concrete depends on total wall length, wall height and wall thickness. A small change in thickness can add a significant amount of concrete on a long perimeter wall. Likewise, taller basement walls use substantially more concrete than short stem walls even when the perimeter is the same.
If the foundation contains multiple wall heights, stepped walls or different thickness zones, calculate each section individually. Add the resulting cubic yards only after each section has been estimated using its actual dimensions.
Wall thickness has a direct one-to-one effect on concrete volume. A 10-inch wall contains 25% more concrete than an 8-inch wall of the same length and height. A 12-inch wall contains 50% more concrete than an 8-inch wall with the same other dimensions.
This calculator does not determine the required wall thickness. Foundation wall thickness can depend on retained soil height, building loads, reinforcement, wall support conditions, soil conditions, drainage, seismic requirements and local building codes. Enter the thickness specified by approved plans or a qualified design professional.
Many projects require estimating both the vertical foundation wall and the continuous concrete footing beneath it. The second calculator mode handles a simple case where the footing runs the same total length as the wall.
The wall volume is calculated from wall length × wall height × wall thickness. The footing volume is calculated from the same length × footing width × footing thickness. The two volumes are then added together before applying the optional allowance.
If your project has isolated pads, stepped footings, enlarged column bases or piers, calculate those separately. For more detailed footing work, use the Concrete Footing Calculator or Concrete Pier Calculator.
Large openings remove concrete from the wall and can be deducted when the opening dimensions are known. However, tiny penetrations, sleeves and irregular recesses may not be worth deducting for a practical order estimate.
The Openings Deduction mode calculates the full gross wall first, then subtracts opening width × opening height × wall thickness × number of openings. If the total opening volume exceeds the gross wall volume, the inputs are invalid.
Be careful with openings that include concrete lintels, thickened jambs or special reinforcement zones. The geometric void may not equal the entire framed opening area when concrete surrounds or bridges part of the opening.
The calculator's optional cost field estimates concrete material only from the ready-mix price per cubic yard entered by the user. Concrete prices differ by region, supplier, mix specification, order size, delivery distance and local market conditions, so the page does not force one national price assumption.
If pump placement will be required, use the Concrete Pump Capacity Calculator to compare required placement output and estimated pumping time.
Small stem-wall repairs or short sections may be possible with bagged concrete, but full foundation walls usually require a large volume of material and coordinated placement. The Bags & Cost calculator shows how rapidly bag quantities can increase when wall height and length become substantial.
Bag yields vary by product, so enter the yield shown by the manufacturer whenever possible. The default 0.60 cubic foot value is only an example commonly associated with some 80 lb concrete products and should not replace the actual package data.
For larger foundation walls, ready-mix delivery is commonly considered because it provides larger batch volumes and faster placement. Site access, truck discharge location, pump setup and delivery sequencing should be planned before the pour.
Reinforcement does not normally get subtracted from concrete volume in ordinary material estimating. Rebar occupies some physical volume, but concrete ordering is typically based on the full formed geometry rather than subtracting reinforcing steel.
Reinforcement size, spacing, lap length, cover and detailing are structural matters that should follow project drawings and applicable requirements. For material estimating, use the Concrete Rebar Calculator or Concrete Rebar Length Calculator separately from the wall concrete volume.
The exact mathematical volume assumes perfectly uniform wall dimensions and zero placement loss. Real projects can differ. Forms may vary slightly, footing elevations can change, concrete can remain in the pump or hopper and wall intersections may contain more concrete than a simplified linear model suggests.
The calculator includes several allowance percentages for planning comparisons. The appropriate final order should be based on field measurements, actual drawings and supplier practices.
Be consistent with units. The calculator expects wall thickness in inches and converts it automatically.
Add all relevant perimeter or interior foundation wall segments before calculating total volume.
Calculate different wall heights separately rather than using one height for the entire foundation.
Only subtract the actual concrete void, not a larger framed or rough opening if concrete lintels or jambs remain.
Wall concrete and footing concrete are separate geometric volumes unless combined explicitly in the calculator.
Large local thickening can add meaningful concrete and should be calculated separately.
This tool estimates concrete quantity. It does not determine wall thickness, reinforcement, strength, drainage or code compliance.
Foundation wall pours require planning beyond concrete quantity. Forms should be braced and aligned, reinforcement and embeds should be positioned, access should be confirmed and placement equipment should be ready before concrete arrives.
Concrete placement is time-sensitive. Delivery spacing should match the planned placement rate so trucks do not stack up on site while forms, crews or pumps become overloaded. For large pours, compare the total volume with the Concrete Truck Count Calculator.
Weather can also affect placement and curing. Hot, cold, windy or wet conditions can require additional precautions based on the project specification and applicable construction guidance.
The quantity estimate should use the actual formed concrete dimensions. Excavation width can be much greater than wall thickness because crews need working space around the foundation. Do not multiply excavation width by wall height and call the result concrete volume.
After forms are installed, re-check wall length, height and thickness. A quantity estimate based on plan dimensions is useful for early planning, but field measurements can improve the final order before concrete placement.
For technical concrete information, construction education and industry standards, useful resources include the American Concrete Institute and the National Ready Mixed Concrete Association.
Foundation walls can be structural and safety-critical. Follow approved project drawings, local building requirements and qualified professional guidance where appropriate.
Foundation wall volume comes from total wall length, wall height and wall thickness. Footing volume is calculated separately and then added.
Assume a foundation wall has a total length of 80 feet, a height of 8 feet and a thickness of 8 inches. Eight inches equals 0.667 foot.
With a 10% comparison allowance, the order estimate becomes approximately 17.38 cubic yards.
If a continuous footing is also present, calculate its volume separately and add it to the wall volume before final ordering.
Common questions about poured walls, basement foundations, wall thickness, footings, openings, bags and cubic yards.