Concrete Footing Calculator
Calculate concrete volume for wall and column footings.
Last updated 2026-08-21
What Is a Concrete Footing Calculator?
A concrete footing calculator tells you how much concrete you need for wall and column footings that support structures like decks, porches, and foundation walls. You enter the footing length, width, depth, and how many footings you are pouring, and it returns the total cubic yards. It helps you order the right volume for the load-bearing base of your build.
How It Works
Volume (ft³) = Footing Length × Width × (Depth ÷ 12) × Number of Footings.
Example
For 6 footings of 2 ft × 2 ft at 12 in deep: 2 × 2 × (12 ÷ 12) × 6 = 24 ft³ ≈ 0.89 cubic yards.
How to Calculate
- Measure each footing length and width in feet. For 2 ft by 2 ft column footings, enter 2 and 2.
- Enter the footing depth in inches. A 12 in deep footing is typical, so enter 12.
- Enter the number of footings, such as 6 for six piers.
- The calculator computes 2 × 2 × (12 ÷ 12) × 6 = 24 cubic feet, or about 0.89 cubic yards.
- Apply a 10 to 15% waste factor because formwork, rebar, and uneven excavation add to the pour, then order that yardage.
Concrete PSI Guidance for Common Builds
| Use | Recommended PSI | Notes |
|---|---|---|
| Footings | 3,000 to 4,000 psi | Standard residential support |
| Slabs | 3,000 to 4,000 psi | Most flatwork |
| Driveways | 4,000 psi | Handles vehicle loads |
| Columns | 4,000 psi | Structural vertical loads |
Sources
Frequently Asked Questions
How deep should footings be?
Most building codes require footings below the frost line — often 12 in deep or more, depending on your region.
Do footings need more concrete than slabs?
Footings often benefit from a higher waste allowance (10–15%) because of formwork, rebar, and uneven excavation.
Can I use the same concrete for footings and slabs?
Yes, a standard 3,000–4,000 psi mix works for both in most residential builds.
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