Concrete Calculator - Yards and Bags
Estimate concrete cubic yards, bag counts, and cost for slabs and driveways.
Tool Interface
Concrete Calculator
Estimate cubic yards, ready-mix bags, and cost for slabs, footings, and driveways.
How to use
Enter the length and width of your slab in feet, pick the thickness, and optionally add your local price per cubic yard. Press Calculate to see how much concrete you need, how many bags of each size that equals, and the estimated cost. Use Reset to start over.
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About This Tool
Frequently Asked Questions (FAQ)
How much concrete do I need?
Enter the slab length, width and thickness. The calculator converts the volume to cubic yards — the unit concrete is ordered in.
How thick should my slab be?
Four inches suits patios and walkways. Driveways and garage floors usually need five to six inches to handle vehicle weight.
Should I add a waste allowance?
Yes. Ordering five to ten percent extra covers spillage, uneven subgrade and form variations so you do not run short mid-pour.
How is the cost estimated?
Enter your local price per cubic yard to turn the volume into a material cost estimate.
Is the concrete calculator free?
Yes. It is free to use with no signup and no limits.