Concrete Wall Volume Calculator
Estimate how much concrete you need for a wall in cubic yards. Enter the wall's length and height in feet and its thickness in inches to get the concrete yardage for ordering ready-mix.
Estimate Concrete for Wall Construction
Concrete Wall Yardage Formula
Where:
- \(V\) — concrete yardage (yd³)
- \(L\) — length of the wall (ft)
- \(H\) — height of the wall (ft)
- \(T\) — thickness of the wall (in)
- \(0.037037\) — conversion factor from cubic feet to cubic yards (\(1 \text{ yd}^3 = 27 \text{ ft}^3\))
The formula multiplies the wall's face area \(L \times H\) by its thickness, converting the thickness from inches to feet by dividing by 12, and then converts the volume from cubic feet to cubic yards — the unit ready-mix suppliers use for ordering.
Concrete Wall – Calculation Example
Example: a residential basement wall is 20 ft long, 8 ft high, and 6 in thick.
\[ V = 20 \cdot 8 \cdot \left( \frac{6}{12} \right) \cdot 0.037037 \]
\[ V = 160 \cdot 0.5 \cdot 0.037037 = 80 \cdot 0.037037 \approx 2.96 \]
Result: the wall requires about 2.96 yd³ of concrete (80 ft³).
How to Use the Calculator
- Enter the Length of the wall in feet.
- Enter the Height of the wall in feet.
- Enter the Thickness of the wall in inches (e.g. 6 for a 6-inch wall, 8 for an 8-inch wall).
- Read the Concrete Yardage in cubic yards, ready to use when ordering ready-mix.
What Is Concrete Yardage for a Wall?
Concrete yardage is simply the volume of concrete a structure needs, expressed in cubic yards. In the US, ready-mix plants sell concrete by the full or partial cubic yard, so converting a wall's dimensions into cubic yards tells you exactly how much to order.
A wall is a rectangular prism: its volume is the face area (length × height) multiplied by its thickness. The only subtlety is units — wall length and height are usually measured in feet, while thickness is typically specified in inches (6 in, 8 in, 12 in are common for poured walls). Dividing the thickness by 12 puts everything in feet, and dividing the resulting cubic feet by 27 (multiplying by 0.037037) gives cubic yards.
The result is the net volume of the wall itself. It does not include waste, over-excavation, or a footing under the wall — for footings and slabs, use the Concrete Footing/Slab Pours calculator or the Concrete Footing Yard calculator. If you need the total for an entire project with several elements, the Concrete Yardage calculator can combine multiple pours.
Interpreting the Result
A small yardage number can be misleading: a 20 × 8 ft wall at 6 in thick is only about 3 yd³, but short loads (typically under 1–3 yd³) often carry a surcharge from the supplier. If several small walls are part of the same job, it is usually cheaper to order them together in a single delivery.
Once you know the yardage, you can estimate cost by multiplying it by the local price per cubic yard, and plan the pour — a wall this size needs to be poured in one continuous operation to avoid cold joints.
Assumptions, Limitations and Practical Tips
- Rectangular wall: the calculator assumes a straight wall with uniform thickness over its full length and height. Tapered or stepped walls need to be split into sections and calculated separately.
- No deductions: openings such as doors and windows are not subtracted. For most residential walls the openings save little concrete, but if you need precision, subtract their volume (area × thickness) from the total.
- Add a waste margin: order 5–10% extra to cover spillage, over-excavation, and uneven formwork. For the example above, rounding 2.96 yd³ up to 3.25 yd³ is a safe order.
- Footings are separate: a wall normally sits on a footing, which is a separate pour with its own volume.
- Verify thickness: common poured-wall thicknesses are 8 in for basement walls and 6 in for shorter retaining or stem walls — check your plans before ordering.
If you plan to mix the concrete yourself instead of ordering ready-mix, use the Concrete Ingredients calculator to work out the cement, sand, and gravel quantities, and the Concrete Mix Ratio calculator to choose the right strength mix for your wall.
Frequently Asked Questions
How many 80-lb bags of quikrete equal a cubic yard?
One cubic yard of concrete equals about 45 eighty-pound bags of pre-mixed concrete (or 60 sixty-pound bags). A 3 yd³ wall would need roughly 135 eighty-pound bags, which is why mixing by hand is only realistic for very small walls. For anything over about 1 yd³, ordering ready-mix delivered by truck is usually faster, cheaper, and produces a more consistent, stronger wall.
How much does a cubic yard of concrete weigh?
A cubic yard of standard concrete weighs roughly 4,000 pounds (about 2 short tons), depending on the mix — lightweight mixes can be closer to 3,000 lb and reinforced mixes slightly heavier. This matters for two reasons: checking your truck or trailer capacity if picking up concrete yourself, and estimating the total load a wall places on its footing and the soil beneath it.
How do I convert the result to cubic meters or liters?
Multiply the calculator's result by 0.7646 to get cubic meters, or by 764.6 to get liters. For example, the 2.96 yd³ wall from the example is about 2.26 m³. Going the other way, multiply cubic meters by 1.308 to get cubic yards. Suppliers outside the US typically sell concrete by the cubic meter, so this conversion is essential when ordering internationally.
How much should I budget for a concrete wall?
Ready-mix concrete typically runs $130–$250 per cubic yard depending on region and mix design, so a 3 yd³ pour might cost $400–$750 in material alone. Add forming, rebar, labor, and delivery or short-load fees, and formed walls commonly total $20–$60 per square foot of wall face installed. Prices vary widely — get local quotes before committing, and confirm whether minimum-load charges apply.
Should I pour a concrete wall all at once or can I stop partway?
A formed wall is best poured in one continuous lift. If the concrete starts setting before you finish, the seam between old and new material becomes a cold joint — a weak, leak-prone line in the wall. Have enough help, tools, and concrete on site to finish without interruption. If a wall is too tall for one pour, plan deliberate construction joints with keyways and rebar at planned locations instead.
How thick should a concrete wall be?
Typical residential poured walls are 8 in thick for full-height basement walls 8 ft tall, while 6 in is common for shorter stem walls and low retaining walls. Retaining walls over about 4 ft may need 10–12 in and engineered reinforcement. Local building codes set minimums, and rebar spacing is just as important as thickness — always follow your approved plans rather than general rules of thumb.