How to use it
- Enter length, width, and thickness in the fields provided.
- Enter the price per cubic yard.
- Read the cubic yards, estimated cost, bag count and cubic feet results.
What it does – The Cement Sand Gravel Estimate Calculator takes the slab dimensions you input (length, width, thickness) and instantly converts them to the volume you’ll need in cubic yards and cubic feet. It then multiplies the cubic yards by the price you provide to give a clear estimated cost, and divides the cubic feet by 0.6 cf per 80‑lb bag to show how many bags to order. Why it matters – Knowing the exact volume prevents over‑ordering, saves money, and avoids project delays. The cost preview helps you budget before you call a supplier, and the bag count ensures you purchase the right amount of mix. How to read it – Cubic yards is the standard concrete order unit, cubic feet helps you verify bag calculations, and the cost line shows the total you’ll likely pay.
Pro tips
- Add 10% extra for waste and spillage.
- Round up bag count to the next whole bag.
- Order material a day early to avoid delivery delays.
- Double‑check thickness conversion from inches to feet.
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.
- A DIY gardener building a 6 ft × 8 ft garden walkway 3 in thick.
Case study
Mike needed a 15 ft × 12 ft slab 5 in thick for his workshop. Using the calculator, he saw he required 2.2 cubic yards, 8 bags, and a $330 cost. He ordered exactly that amount, avoided a $150 over‑order, and completed the pour on schedule.