Calculate exactly how much concrete you need for your project
Quick Answer:A standard 10x10 ft slab at 4 inches thick requires approximately 1.23 cubic yards of concrete in 2026, which equals about 34 bags of 80-lb pre-mix or 45 bags of 60-lb pre-mix, including a 10% waste factor.
Concrete Needed
Calculating... cubic yards
Volume
-- cu ft
60-lb Bags
-- bags
80-lb Bags
-- bags
Total Weight
-- tons
To calculate concrete for a slab, measure the length and width in feet, then the depth in inches. Convert the depth to feet by dividing by 12. Multiply length x width x depth (in feet) to get cubic feet, then divide by 27 to convert to cubic yards. For example, a 10 ft x 10 ft slab at 4 inches deep: 10 x 10 x 0.333 = 33.3 cubic feet, or 1.23 cubic yards. Always add 5-10% extra for waste, spillage, and uneven subgrade.
A 60-lb bag of concrete covers approximately 0.45 cubic feet, while an 80-lb bag covers about 0.6 cubic feet. To find the number of bags needed, calculate your total volume in cubic feet and divide by the coverage per bag. For projects requiring more than 2 cubic yards, ordering ready-mix concrete from a truck is typically 30-40% cheaper and far less labor-intensive than mixing individual bags.
In 2026, ready-mix concrete averages $130-$150 per cubic yard delivered, though prices vary by region and order size. Bagged concrete (60-lb or 80-lb) costs around $5-$7 per bag at home improvement stores, which works out to roughly $300-$420 per cubic yard. Delivery fees for ready-mix typically range from $50-$100. For large projects, additional costs include labor ($50-$75 per hour), rebar or wire mesh, and form lumber.