Footing 1
Total length: — ft · Width: — in · Depth: — in
Strip footing quantity
Concrete Footing Calculator
Calculate concrete volume for a strip footing using total length, width, and depth.
Project
Formula
Run length times the formed cross-section
Footing volume = total length × width × depth. Length is in feet. Width and depth are in inches, because that is how a formed footing is usually measured.
Common mistake
Counting soil overbreak as concrete
Enter the formed width and depth, not the loose excavation, unless concrete will actually fill that extra space. A wider pad or step is another section, not a higher average for the whole run.
Worked quantities
Strip footing runs
These rows are quantity checks for runs you have already sized. They do not select width, depth, steel, or frost protection.
| Run | Width | Depth | Measured yd³ | Order yd³ |
|---|---|---|---|---|
| 20 ft run | 12 in | 8 in | 0.49 | 0.75 |
| 40 ft run | 16 in | 8 in | 1.32 | 1.50 |
| 60 ft run | 18 in | 12 in | 3.33 | 3.75 |
| 24 ft run | 24 in | 12 in | 1.78 | 2.00 |
| 100 ft run | 16 in | 10 in | 4.12 | 4.75 |
Field check
Total the actual runs
Add the lengths of footing runs that share one width and depth. Put wider pads, steps, or thickened intersections in their own sections when their geometry is materially different.
Field check
Use formed width and depth
Enter the concrete dimensions, not automatically the excavation dimensions. Soil overbreak only belongs in the estimate when concrete will actually fill that extra space.
Field check
Quantity is not footing design
The tool does not select width, depth, reinforcement, bearing capacity, or frost protection. Those dimensions must be established before the material calculation is meaningful.
Questions
What the footing calculator answers
Can I add several footing runs?
Yes. Add a section for each distinct width or depth.
Does ConcreteQty select footing dimensions?
No. It calculates from the dimensions you provide.
Why is width entered in inches?
US footing widths and depths are commonly measured in inches while total runs are measured in feet.
Next step
Add the wall or slab that sits on this footing
Bag yields follow the cited manufacturer data. See sources and review dates.