Concrete Volume Calculators

Calculate exact concrete quantities for any pour. Get cubic yards, bag counts, and weight estimates for slabs, footings, sonotubes, steps, and more.

Slab Calculator

A standard 4-inch residential slab needs roughly 0.

Calculate concrete needed for columns and pillars with our free tool.

Building concrete curbs? Calculate exactly how much concrete you need with our free tool.

A standard 12-inch diameter deck footing at 48 inches deep needs about 6 bags of 80-lb concrete.

A standard two-car driveway (20×50 ft at 5 inches thick) needs 15.

A standard 20-foot strip footing (2 feet wide, 12 inches deep) requires 1.

Planning a foundation? Calculate concrete needs for foundation walls and footings with our free tool.

Planning a garage floor? Calculate exactly how much concrete you need with our free tool.

A 16×12 ft patio at 4 inches thick needs about 2.

Building pier footings? Calculate concrete needs with our free tool.

A standard fence post hole (10 in diameter, 36 in deep) needs about 3 bags of 80-lb concrete — 8 posts need roughly 22 bags total.

A 10×12 ft shed foundation at 4 inches thick requires 1.

A 30-foot residential sidewalk (4 ft wide, 4 in thick) needs about 1.

Building concrete steps? Calculate exactly how much concrete you need with our free tool.

Planning a walkway or garden path? Calculate your concrete needs with our free tool.

A 12-inch sonotube at 48 inches deep holds 0.

Once you know your concrete volume, use our cost calculators to estimate total project pricing including materials, delivery, and labor.