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
This calculator finds the concrete volume — cubic yards and cubic feet — for a rectangular slab, pad, or floor.
Cinder Block / CMU Wall Calculator
Estimate blocks, mortar, grout, and rebar for any CMU or cinder block wall.
Column Calculator
A 12-inch round concrete column 8 feet tall takes 6.
Curb Calculator
A standard 6×6-inch residential curb uses 0.
Deck Footing Calculator
A standard 12-inch diameter deck footing at 48 inches deep needs about 6 bags of 80-lb concrete.
Driveway Calculator
A 20×50 ft driveway at 5 inches thick needs 15.
Footing Calculator
A standard 20-foot strip footing (2 feet wide, 12 inches deep) requires 1.
Foundation Calculator
A 30×20 ft slab foundation at 8 inches thick takes 14.
Garage Floor Calculator
A standard 24×24 ft 2-car garage slab at 6 inches thick takes 10.
Patio Calculator
A 16×12 ft patio at 4 inches thick needs about 2.
Pier Footing Calculator
Building pier footings? Calculate concrete needs with our free tool.
Post Hole Calculator
A post hole 10 in wide and 36 in deep holds 1.
Shed Foundation Calculator
A 10×12 ft shed foundation at 4 inches thick requires 1.
Sidewalk Calculator
A concrete sidewalk costs $8–13 per square foot installed — about $32–52 per linear foot at the standard 4-foot width.
Steps Calculator
Four concrete steps 48 inches wide with a 7-inch rise and 12-inch tread take 0.
Walkway Calculator
A 25-ft walkway 3 ft wide and 4 in thick takes 0.
Wall Calculator
Estimate concrete volume, formwork area, footing pour, and rebar for any poured concrete wall.
Weight Calculator
A cubic yard of standard concrete weighs about 4,050 pounds — roughly the weight of a small SUV.
Fence Post Calculator
A standard 4x4 fence post hole (10 in diameter, 36 in deep) needs about 3 bags of 80-lb concrete mix — a typical 10-post fence run needs roughly 30 bags total, about 0.
Gravel Calculator
A slab base is usually 4 inches of compacted gravel, and the calculator works it out as length × width × depth ÷ 27, plus 10% for compaction.
Rebar Calculator
A 20×20 ft slab with #4 bars at 16 inches on center needs 32 bars on 64 chairs — 624 linear feet of grid, or 687 lf to order with lap allowance: 35 twenty-foot sticks, about 460 lbs, and $515-1,030 in steel.
Sonotube Calculator
A 12-inch Sonotube at 48 inches deep holds 0.
Need to Estimate Costs Too?
Once you know your concrete volume, use our cost calculators to estimate total project pricing including materials, delivery, and labor.
View Cost Calculators →