Concrete Slab Calculator
Cubic yards and bag count for slabs, pads, and footings.
Enter your slab dimensions to get the concrete volume in cubic yards plus how many 60-lb or 80-lb bags it would take for smaller pours.
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Bags vs. ready-mix
An 80-lb bag of concrete yields about 0.6 cu ft; a 60-lb bag about 0.45 cu ft. Small pads can be bagged, but anything over roughly a cubic yard is cheaper and easier as ready-mix delivery.
FAQ
How thick should a concrete slab be?
4 inches is standard for patios and walkways; 5–6 inches for driveways or anything bearing vehicle weight.