Home › Concrete Calculator
Free concrete calculator. Estimate cubic yards and bags of concrete needed for slabs, footings, and columns.
The concrete calculator estimates how much concrete — by cubic yard or by bag — is needed for a slab, footing, column, or set of stairs. It applies a typical waste factor so an order does not come up short.
Contractors, masons, landscapers, and DIY homeowners pouring patios, sidewalks, footings, or fence-post holes. Suppliers and ready-mix vendors also use it to confirm a customer's order quantity.
It prevents both expensive over-orders and worse mid-pour shortages by translating dimensions into the actual volume needed. It also accounts for the small but routine spillage and over-excavation that real jobs experience.
It answers questions like "How many cubic yards do I need for a 16 by 12 foot slab at 4 inches thick?", "How many 80-pound bags will fill twelve 12-inch fence-post holes?", and "How much extra concrete should I order to cover the typical 10% waste?"