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 calculator turns the dimensions of your slab (length, width, thickness) into three practical numbers: cubic feet, cubic yards, 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 the mix is enough to fill the form without shortfalls. How to read the results – Cubic feet is the raw volume; divide by 27 to see cubic yards, the industry‑standard unit for delivery. Then divide cubic feet by 0.6 to get the bag count. The tool uses the standard 0.6 ft³ per bag, so the bag total is ready for ordering. No extra calculations required.
Pro tips
- Add 5‑10% extra for waste and spillage.
- Round up the bag count to the next whole bag.
- Order bags in multiples of 10 for easier delivery.
- Double‑check thickness conversion (inches to feet) before entering.
Real-life examples
- A homeowner pouring a 10 ft × 12 ft patio 4 in thick.
- A contractor estimating concrete for a 20 ft × 30 ft driveway 6 in thick.
- A landscape designer planning an 8 ft × 8 ft garden path 3 in thick.
Case study
John needed a 10 × 12 ft patio at 4 in depth. The calculator showed 40 ft³, 1.5 yd³ and 67 bags. He ordered 70 bags, avoided a short‑run, and completed the job on schedule.