How to use it
- Enter length in feet.
- Enter width in feet.
- Enter thickness in inches.
- Read cubic yards, bags, and cubic feet results.
What it does – The Aggregate Concrete Calculator turns the length, width, and thickness of any slab, walkway, or footing into three practical measures: cubic yards of concrete, the number of 80‑lb bags you’ll need, and the total cubic feet. Why it matters – Knowing cubic yards lets you get accurate quotes from suppliers, while bag counts help you budget and avoid costly over‑orders. Cubic feet is useful for comparing against material specs or for small projects. How to read the output – Cubic yards is the industry‑standard volume for delivery; multiply by 27 to see the equivalent cubic feet. Divide the cubic‑feet result by 0.6 to see how many 80‑lb bags are required, then round up to the next whole bag. All results appear instantly after you enter the three dimensions.
Pro tips
- Add 5‑10% extra for waste and spillage.
- Always round bag count up to the next whole bag.
- Order a little more if the subgrade isn’t perfectly level.
- Convert thickness from inches to feet before entering values.
Real-life examples
- Homeowner pouring a 10 × 12 ft patio 4 in thick.
- Contractor estimating concrete for a 30 × 40 ft warehouse slab 6 in thick.
- DIYer building a 6 × 8 ft garden stepping‑stone base 3 in thick.
Case study
Mike needed a 12 × 15 ft patio 4 in thick. Using the calculator, he saw he required 2.6 cubic yards, which translated to 118 bags. He ordered 120 bags, avoided a second delivery, and completed the patio on schedule.