How to use it
- Enter length, width, and thickness in the fields provided.
- Enter the price per cubic yard of concrete.
- Click the Calculate button.
- Read the cubic yards, estimated cost, bag count, and cubic feet results.
This tool takes the dimensions of your concrete project—length, width and thickness—and instantly converts them into the total cubic yards of material required. It then multiplies that volume by the price you provide to give a clear estimated cost. Because each 80‑lb bag yields about 0.6 ft³, the calculator also tells you how many bags you’ll need, and it shows the raw cubic‑feet amount for ordering ready‑mix. Knowing these numbers helps you budget accurately, avoid over‑ordering, and schedule deliveries with confidence. The results appear in four columns: cubic yards, total cost, number of bags, and cubic feet, so you can compare the figures side‑by‑side and make informed decisions before you place an order. If your slab is irregular, break it into smaller rectangles, compute each, then sum the totals. The calculator updates instantly as you adjust any input, letting you experiment with different thicknesses or material prices without leaving the page.
Pro tips
- Add a 10% waste allowance to cover spillage and variations.
- Round the bag count up to the nearest whole bag.
- Order one extra bag as a safety margin.
- Convert thickness from inches to feet by dividing by 12.
Real-life examples
- Homeowner pouring a 10 × 12 ft patio 4‑inch thick.
- Contractor estimating concrete for a 30‑ft driveway 6‑inch thick.
- Landscape designer budgeting a raised garden bed 3 ft long, 2 ft wide, 8‑inch thick.
Case study
Mike needed to know how much concrete for his new 12 × 20 ft patio at 5 in thickness. Using the free estimator, he entered the dimensions and his local price, got 2.2 cubic yards, $330 cost, and 620 bags. He ordered 630 bags, avoided a costly shortfall, and finished the patio on schedule.