How to use it
- Enter length in feet.
- Enter width in feet.
- Enter thickness in inches.
- Read cubic yards, bags, and cubic feet results.
The Concrete Footings Calculator lets you input the length, width and thickness of a footing and instantly shows three quantities you need to order: total cubic yards, total cubic feet, and the number of 80‑lb bags. Knowing the volume in cubic yards helps you compare quotes from suppliers, while cubic feet is useful for on‑site measurements. The bag count translates directly to how many standard bags you’ll have to purchase, based on the constant that one 80‑lb bag yields about 0.6 ft³. The results appear as soon as you hit Calculate, so you can adjust dimensions and see the impact on material needs without guesswork. Use the numbers to budget accurately, avoid over‑ordering, and keep your footing project on schedule. You can also copy the results to share with your contractor.
Pro tips
- Add 5‑10% extra for waste and spillage.
- Round up bag count to the next whole bag.
- Order one extra bag to cover minor miscalculations.
- Double‑check thickness units; inches vs. feet cause big errors.
Real-life examples
- A homeowner sizing footings for a new garage slab.
- A contractor estimating material for a commercial patio foundation.
- A DIYer planning concrete steps for a garden retaining wall.
Case study
Mike was planning a 4 × 8 × 10‑inch footing for a deck. Using the calculator he saw he needed 0.74 cubic yards, which translates to 13 bags. He ordered 14 bags, avoiding a costly delivery delay and stayed within budget.