Concrete Slab Calculator
Enter the depth, width and length of your concrete slab to calculate the number of cubic yards needed to complete your project.
What’s the best way to calculate concrete volume?
Determine your concrete needs with our calculator tool or use this straightforward formula: Length × Width × Depth. Take measurements of your project space and multiply all three dimensions for total cubic feet. To get cubic yards, divide that number by 27. Our concrete calculator handles these conversions automatically and adds the recommended waste factor for accurate ordering.
Pro tip for 4-inch slabs: There’s a simple formula contractors use in the field. Take your project’s square footage and divide by 81 – that’s roughly how many cubic yards you’ll need. So a 300 sq ft patio would need about 3.7 yards (300 ÷ 81). While this quick method works for estimates, our calculator above accounts for waste and gives you the exact amount to order.