How to use it
- Enter length in feet
- Enter width in feet
- Enter thickness in inches
- Read cubic yards, cubic feet and bag count
What it does – The Concrete Coverage Calculator takes the length, width and thickness of your slab and instantly converts them to cubic yards, cubic feet, and the number of 80‑lb bags of mix you’ll need. Why it matters – Knowing the exact volume prevents over‑ordering, saves money, and ensures you have enough material to finish without delays. How to read the results – Cubic feet is the raw volume; divide by 27 to see cubic yards, the standard unit for deliveries. Multiply cubic feet by 1 ÷ 0.6 (≈ 1.67) to get the bag count, then round up. All numbers are shown automatically, so you can copy them straight into your purchase order. You can also change any dimension and see how the material needs shift, perfect for comparing different slab thicknesses or adding a small allowance for spillage. The tool works on any device, no download required.
Pro tips
- Add 5‑10% extra for waste and spillage
- Round bag count up to the next whole bag
- Order bags in multiples that match delivery truck capacities
- Double‑check thickness units; inches vs. feet cause big errors
Real-life examples
- A homeowner pouring a 12 ft × 10 ft patio 4 in thick
- A contractor estimating concrete for a 30 ft × 20 ft warehouse floor 6 in thick
- A DIYer planning a concrete driveway ramp with varying thickness
Case study
Mike needed a 10 × 8 ft patio 4 in thick. Using the calculator he saw he required 1.78 cubic yards, which translated to 10 bags. He ordered 10 bags, avoided a costly over‑order, and completed the patio on schedule.