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.

Estimate blocks, mortar, grout, and rebar for any CMU or cinder block wall.

A 12-inch diameter, 8-foot tall concrete column takes 0.

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.

A 30×20 ft slab foundation at 8 inches thick takes 14.

A standard 24×24 ft 2-car garage slab at 6 inches thick takes 10.

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.

Four standard concrete steps (48 in wide, 7-in rise, 12-in tread) take about 0.

A 25-ft walkway 3 ft wide and 4 in thick takes 0.

Estimate concrete volume, formwork area, footing pour, and rebar for any poured concrete wall.

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.