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 Concrete Sq Ft Calculator takes the length, width and thickness you enter and instantly shows three useful measures: total volume in cubic yards, the number of 80‑lb bags required, and the volume in cubic feet. Why it matters – Knowing cubic yards helps you order the right amount of ready‑mix, while bag count lets you buy bagged mix without over‑paying for excess. How to read – One cubic yard equals 27 cubic feet; the bag count is derived from the fact that each 80‑lb bag yields about 0.6 cubic feet. You can save time by entering the dimensions of patios, driveways, sidewalks, or foundation slabs, and the calculator instantly converts them to the units contractors use. The output lets you add a safety margin or adjust for irregular shapes before placing an order.
Pro tips
- Add 5‑10% extra for waste and spillage
- Round up bag count to the next whole bag
- Compare prices per cubic yard, not per bag
- Double‑check thickness conversion from inches to feet
Real-life examples
- Estimating concrete for a new driveway slab
- Planning material for a backyard patio renovation
- Sizing mix for a foundation footings project
Case study
Mike needed to pour a 12 × 8 ft patio 4 in thick. Using the calculator he saw he required 1.6 cubic yards, which translated to 3 bags of mix. He ordered exactly that amount, avoided a $150 over‑order, and completed the patio on schedule.