How to use it
- Enter length in feet.
- Enter width in feet.
- Enter thickness in inches.
- Click Calculate to see cubic yards, cubic feet and bag count.
What it does – The Concrete Bag Footings Calculator turns the three dimensions of your footing into three useful numbers: total cubic feet, cubic yards, and the exact number of 80‑lb bags of mix you’ll need. Knowing the cubic‑yard amount lets you order the right amount of ready‑mix or estimate delivery costs, while the bag count tells you how many retail bags to purchase. The tool uses the standard conversion that one 80‑lb bag yields about 0.6 cubic feet, so the result reflects real‑world material usage. How to read it – Cubic feet is the raw volume, cubic yards is that volume divided by 27 (the number of cubic feet in a yard), and bags is the cubic‑foot total divided by 0.6, rounded up to the nearest whole bag. Use the numbers to budget, order, and avoid costly over‑ or under‑ordering.
Pro tips
- Add 5‑10% extra for spillage and compaction.
- Round bag count up to the next whole bag.
- Order bags in multiples of 5 to reduce shipping costs.
- Double‑check thickness conversion from inches to feet before entering.
Real-life examples
- A homeowner building a 12 ft by 8 ft patio footing.
- A contractor estimating concrete for a new deck support beam.
- A DIY gardener installing a raised‑bed retaining wall footings.
Case study
Mike needed footings for a 10 ft × 6 ft shed. He entered 10, 6, and 4 in into the calculator and got 2.2 cubic yards, 59 cubic feet, and 99 bags. By ordering exactly that amount, he avoided a $150 over‑order and finished the job on schedule.