How to use it
- Enter length, width, and thickness
- Input price per cubic yard
- Click calculate to see results
Get accurate concrete estimates in seconds. Enter your slab dimensions—length, width, thickness—and your price per cubic yard. This calculator returns cubic yards, total estimated cost, bags needed, and cubic feet. Knowing exact volume prevents over-ordering waste and under-ordering delays. The result tells you how many 80-lb bags (0.6 cu ft each) to buy and the total cost based on your local price. Read cubic yards for supplier orders and bags for DIY mix purchases. If thickness is in inches, the tool converts automatically. Use the cubic feet figure to verify bag counts match your volume. Always round up—running short means costly reloads and project stalls. Check your measurements twice before ordering.
Pro tips
- Add 10% waste allowance for cuts and spills
- Round up bag counts—partial bags aren't sold
- Order 5-10% extra for supplier minimums
- Measure thickness accurately—errors multiply volume
Real-life examples
- Pouring a 12x12 shed slab with 4-inch thickness
- Estimating a 20x30 driveway at 6 inches deep
- Calculating footing volume for a deck project
Case study
Before: Mike guessed 3 yards for his garage slab, ordered 2, ran short mid-pour, paid $180 for emergency delivery. After: He used the calculator, entered 40x30x6 inches and $140/yard, got 2.22 yards, ordered 3 with 10% waste, finished in one pour, saved $180 and a week.