Concrete calculators
Concrete Calculator
Estimate concrete volume, 80 lb bags, waste, and material-only cost for slabs, driveways, and rectangular footings. Start with project dimensions, then use a specialized calculator when you need a narrower workflow.
Project dimensions
Choose a project type, enter dimensions, then estimate volume, bags, and cost.
Estimated concrete
Live estimate for the selected project.
Recommended order
Includes 10% waste for the selected project type.
Choose a Specialized Concrete Calculator
Concrete Slab Calculator
Best for patios, sidewalks, garage floors, shed pads, and flatwork.
Concrete Bag Calculator
Estimate 40 lb, 50 lb, 60 lb, and 80 lb bags from volume or dimensions.
Concrete Cost Calculator
Estimate material cost, delivery, labor, and optional project totals.
Concrete Driveway Calculator
Estimate driveway yards, bags, waste, and material-only cost.
Concrete Footing Calculator
Estimate rectangular footings and trenches by length, width, depth, and quantity.
How Concrete Estimates Work
Start with volume
Most concrete estimates start with project volume. For rectangular projects, multiply length by width by thickness, convert inches to feet where needed, then divide cubic feet by 27 to get cubic yards.
Add waste before ordering
Waste helps cover uneven ground, small measuring differences, and placement loss. This calculator keeps material-only cost separate from delivery, labor, taxes, and local fees.
Concrete Calculator FAQ
How do I calculate how much concrete I need?
Choose a project type, enter the dimensions, and add a waste factor. The calculator converts the result to cubic feet, cubic yards, bag counts, and material-only cost when a price per cubic yard is entered.
What projects can this concrete calculator estimate?
This general calculator supports slabs, driveways, and rectangular footings. Use the specialized slab, bag, cost, driveway, or footing calculators when you need a narrower workflow.
How many 80 lb bags are in a cubic yard?
Using a common planning yield of 0.60 cubic feet per 80 lb bag, one cubic yard needs about 45 bags because one cubic yard equals 27 cubic feet.
Should I add waste when ordering concrete?
Yes. Many small concrete projects use 5-10% extra concrete to cover uneven base, spillage, and small measurement differences.