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 Cement Aggregate Calculator turns the dimensions of a slab into three practical numbers: total cubic yards of concrete, how many 80‑lb bags you’ll need, and the raw cubic‑feet volume. Knowing cubic yards lets you order the right amount of ready‑mix from a supplier; the bag count helps you buy bulk dry mix for smaller jobs. The cubic‑feet figure is useful for estimating material waste or comparing different projects. You simply type length, width, and thickness; the tool instantly converts inches to feet, multiplies the three dimensions, then applies the standard 27 ft³ per yard and the 0.6 ft³ per bag constant. Read the results as whole numbers for ordering, and keep a small overage to cover spillage.
Pro tips
- Add 5‑10% extra for waste allowance.
- Round the bag count up to the next whole bag.
- Order concrete in whole cubic yards; suppliers often price per 0.1 yard.
- Double‑check thickness conversion from inches to feet.
Real-life examples
- Homeowner planning a 12 ft × 12 ft patio 4 in thick.
- Contractor estimating a 30 ft × 40 ft warehouse floor 6 in thick.
- DIYer needing material for an 8 ft × 10 ft garden walkway 3 in thick.
Case study
Mike needed a 10 ft × 15 ft patio 5 in thick. Using the calculator he saw he required 1.84 cubic yards, which translated to 107 bags of 80‑lb mix. He ordered 108 bags, avoided a costly shortfall, and finished on schedule.