Formula
How this estimate works
material cost = cubic yards x cost per cubic yard, or bags x cost per bag
A 24 ft by 12 ft slab at 4 in thick with 10% waste is about 3.91 cubic yards; at $165 per cubic yard, material cost is about $645 before fees.
Estimate concrete cost
Concrete cost depends on volume, delivery method, local ready-mix pricing, bag price, waste factor, and minimum order rules. Enter local unit prices to compare ready-mix and bagged estimates.
Ready-mix versus bag cost
Bagged concrete can be convenient for small jobs, but the labor and total bag count rise quickly. Ready-mix often makes more sense once the project reaches a larger cubic-yard amount.
Assumptions used
- Ready-mix cost uses the entered cost per cubic yard.
- Bag cost uses rounded whole bags and the entered cost per bag.
- Labor, delivery fees, reinforcement, base prep, and finishing are not included.
Before you order materials
- Ask suppliers about short-load fees and delivery minimums.
- Compare material cost with labor and mixing time for bagged concrete.
- Confirm mix design and strength requirements before ordering.
Frequently asked questions
How do I estimate concrete cost?
Calculate the cubic yards needed, add waste, then multiply by local cost per cubic yard or compare against the rounded bag count.
Why does concrete price vary?
Prices vary by region, mix design, delivery distance, fuel, short-load fees, and supplier minimums.
Does this include labor or finishing?
No. This calculator estimates material cost only. Labor, forms, reinforcement, base prep, delivery fees, and finishing are separate.