How this driveway concrete calculator works
cubic feet = length × width × thickness ÷ 12cubic yards = cubic feet × (1 + waste) ÷ 27bags = ceiling(cubic feet with waste ÷ bag yield)Understanding your result
The 4-inch thickness and 10% waste are editable examples, not design recommendations. Site excavation, soil bearing, drainage, frost, slope, vehicle load, joints, reinforcement, and local code determine an appropriate assembly.
Frequently asked questions
How many 80 lb bags make one cubic yard?
At QUIKRETE’s nominal 0.60 cu ft yield, 45 bags equal 27 cu ft. Confirm the exact product label and round up to full bags.
Does a driveway need rebar?
Reinforcement depends on design and local requirements. This page only totals the length of a spacing value the user supplies; it does not select bar size, spacing, cover, laps, or reinforcement type.
Methodology & data sources
Important construction disclaimer
Quantity estimate only—not structural, geotechnical, code, drainage, or safety advice. Confirm design, utilities, permits, excavation, reinforcement, and order quantity locally.