How to use it
- Enter length in feet
- Enter width in feet
- Enter thickness in inches
- Read cubic yards, bags and cubic feet results
This tool converts the dimensions of a concrete slab—length, width and thickness—into three practical measures. Cubic feet shows the raw volume, useful for on‑site calculations. Divide that number by 27 to see cubic yards, the unit most suppliers quote. Finally, the calculator divides cubic feet by 0.6 (the yield of one 80‑lb bag) to give you the bag count you’ll need to order. Knowing each figure helps you budget accurately, avoid shortages, and communicate clearly with contractors. The results appear instantly, so you can adjust dimensions and see how material needs change in real time.
Pro tips
- Add 5‑10% extra for waste and spillage
- Round bag count up to the next whole bag
- Order bags in full pallets when possible to reduce shipping fees
- Double‑check thickness conversion from inches to feet before entering
Real-life examples
- A homeowner planning a 12‑ft by 10‑ft patio at 4‑inch depth
- A contractor estimating material for a garage floor slab
- A landscaper sizing a concrete walkway with varying widths
Case study
Mike entered a 10 ft × 12 ft slab at 4 in thickness, saw 40 ft³, 1.5 yd³ and 67 bags, ordered 70 bags, and completed his patio without a single mix runout.