Foundation estimating
Concrete Foundation Calculator for Footings, Walls, and Piers
Estimate concrete volume for foundation footings, stem walls, pier pads, and slab edges. Use the calculator workflow, add waste, and verify structural sizing before ordering concrete.
How to use this workflow
Separate the foundation into sections
List each footing, wall, pier, or thickened slab edge as its own rectangle or cylinder before calculating volume.
Measure in feet and inches
Record length, width, diameter, and depth. Convert inches to feet inside the calculator so cubic yards are correct.
Calculate and add the sections
Run each foundation section through the calculator, add the cubic yards, and keep a note of the assumptions used.
Add waste and verify the design
Add 5-10% for uneven excavation and spillage, then confirm footing size, reinforcement, and local code requirements.
Foundation volume formula
For rectangular footings and walls, multiply length by width by depth to get cubic feet, then divide by 27 to convert to cubic yards. For round piers, use the cylinder shape in the calculator.
What the calculator does not decide
The calculator estimates concrete quantity. It does not replace structural design, soil evaluation, rebar layout, inspection requirements, or a permit decision.
Ordering checks
Round ready-mix orders to the supplier's increment, ask about short-load fees, and confirm truck access before scheduling a foundation pour.
Next step
Open the concrete calculator, choose the closest shape for each foundation section, and save the final cubic-yard total with the waste allowance shown.
Quick answers
How do I calculate concrete for a foundation footing?
Multiply the footing length by width by depth in feet, divide the result by 27, then add 5-10% for waste and excavation variation.
Can I calculate foundation walls and footings together?
Yes. Calculate each section separately, then add the cubic yards together so different widths, depths, and wall lengths are not averaged incorrectly.
Should I order extra concrete for foundations?
Yes. Foundation excavations are rarely perfect, so a 5-10% waste allowance is usually safer than ordering the exact mathematical volume.
Does this page tell me how wide my footing should be?
No. It estimates quantity only. Footing width and depth depend on loads, soil, frost depth, and local building rules.
What concrete strength should foundations use?
Many residential foundations use 3000-4000 PSI concrete, but the required mix depends on plans, exposure, code, and engineering requirements.