Concrete Slab Calculator
Cubic yards and bags of concrete for a slab.
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How to use this calculator
- Enter the slab length, width, and thickness.
- See the volume in cubic yards and the bags required.
- Compare bag cost against ready-mix delivery.
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Frequently asked questions
- How many bags of concrete are in a cubic yard?
- It takes about 60 sixty-pound bags or 45 eighty-pound bags to make one cubic yard of concrete.
- Should I use bags or ready-mix?
- For small jobs under about a cubic yard, bags are convenient. For larger slabs and driveways, ready-mix delivery is cheaper and faster.