How to use it
- Enter length in feet.
- Enter width in feet.
- Enter thickness in inches and waste factor.
- Click Calculate to see raw and waste‑adjusted cubic yards.
This calculator converts the dimensions of your slab—length, width, and thickness—into the exact volume of concrete measured in cubic yards. It then applies your waste factor so you order enough material to cover spillage, over‑fill, and variations in sub‑grade. Knowing the precise cubic yards helps you avoid costly over‑orders or shortfalls that delay a job. The result appears in two rows: Cubic Yards of Concrete (the raw volume) and Cubic Yards with Waste (the adjusted amount). Use the numbers to get accurate quotes from suppliers and keep your budget on track. The tool works instantly in your browser, no download required. Simply type the measurements, set a waste factor (commonly 0.05‑0.10), and the calculator does the math using the industry‑standard 27 cubic feet per cubic yard and 12 inches per foot. The output is ready to copy into your order form or share with your contractor.
Pro tips
- Add a 5‑10% waste factor for typical residential pours.
- Round up the final cubic yards to the nearest 0.1 to match supplier increments.
- Order concrete a day early to avoid weather delays.
- Double‑check thickness units; inches must be entered, not feet.
Real-life examples
- A homeowner estimating concrete for a new patio slab.
- A contractor sizing a driveway pour with a specified waste allowance.
- A landscape designer budgeting material for a raised garden bed.
Case study
Mike needed 2.3 cubic yards for his backyard patio but kept ordering too much. After entering his dimensions and a 0.07 waste factor, the calculator showed 2.45 cubic yards total, letting him order exactly what he needed and save $200.