How to use it
- Enter length in feet.
- Enter width in feet.
- Enter depth in inches.
- Add waste % and click Calculate.
What it does The Ready Mix Concrete Calculator turns the dimensions of your slab—length, width, and depth—into the concrete volume you’ll need, then adds the waste allowance you specify. The result appears in cubic yards, the unit suppliers use, and shows the total ready‑mix order.
Why it matters Ordering too little means delays and extra trips; ordering too much wastes money and space. By seeing the exact cubic yards before you call a truck, you can budget accurately and schedule deliveries with confidence.
How to read the output The first number is the base volume of concrete required. The second number includes the waste percentage, giving you the final ready‑mix quantity to order. The calculator automatically converts depth from inches to feet, then uses the standard 27 cubic‑feet per cubic‑yard factor, so you don’t have to do any manual math.
Pro tips
- Use a 5‑10% waste allowance for typical residential pours to cover minor spillage and leveling.
- Round up the final cubic yards to the nearest whole number; trucks are billed by the whole yard.
- Order a little extra if you anticipate changes in slab size or depth during the project.
- Double‑check that depth is entered in inches, not feet, to avoid large miscalculations.
Real-life examples
- A homeowner estimating concrete for a new patio slab.
- A contractor preparing a bid for a garage floor pour.
- A landscape designer calculating material for a retaining wall footings.
Case study
John, a DIY homeowner, entered his 20 ft × 15 ft patio dimensions and a 4 in depth. The calculator showed 0.74 cyd base volume; with a 7% waste factor it recommended 0.79 cyd. He ordered 0.8 cyd, avoided a costly second delivery, and finished on schedule.