Calculate concrete volume, cubic yards, cubic meters, bags of concrete, ready-mix trucks and estimated cost in seconds.
3
Slab Shapes
3
Bag Sizes
2
Systems
100%
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Enter Slab Details
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Enter your slab dimensions and click Calculate to see concrete estimates.
Concrete Volume
0 cu yd
Cubic Feet
0 cu ft
Ready Mix Trucks
0 trucks
10 cu yd per truck
80 lb Bags
0 bags
60 lb Bags
0 bags
40 lb Bags
0 bags
Estimated Material Cost
—
Enter price to calculate
Calculation Summary
ShapeRectangle
Dimensions0 × 0
Thickness0 in
Volume0 cu yd
Material Cost—
Frequently Asked Questions
A concrete calculator estimates the volume of concrete needed for a slab, footing, column, or other structure. By entering the dimensions of your project, the calculator tells you how many cubic yards or cubic meters of concrete you need, along with the number of bags or ready-mix trucks required.
To find cubic yards, multiply the length (in feet) by the width (in feet) by the thickness (in inches divided by 12), then divide by 27. For example, a 10ft × 10ft slab at 4 inches thick is 10 × 10 × (4/12) ÷ 27 = 1.23 cubic yards.
Approximately 45 bags of 80 lb concrete, 60 bags of 60 lb concrete, or 90 bags of 40 lb concrete make up one cubic yard. These estimates are based on standard yield: an 80 lb bag yields about 0.6 cu ft, a 60 lb bag yields 0.45 cu ft, and a 40 lb bag yields 0.30 cu ft.
Common slab thicknesses: 4 inches for walkways and patios, 6 inches for driveways and garage floors, 8–10 inches for heavy vehicle traffic, and 12+ inches for commercial or structural applications. Always check local building codes for minimum requirements.
Standard ready-mix concrete trucks carry 10 cubic yards (approximately 8 cubic meters) of concrete. For smaller projects, some companies offer mini-mix trucks carrying 2–3 cubic yards. This calculator uses 10 cubic yards as the default truck capacity.