Concrete Pad Material Estimator
Enter your pad size in feet and inches — get ready-mix yards, bag count, gravel, rebar, and form material. Try the BBQ pad example (10' × 12'-8" × 4.5") to see a real project breakdown.
Pad dimensions
Typical patio / BBQ pad: 4"–6". Driveways often 4"+.
Your pad
10' × 12' 8" × 4.5"
126.7 sq ft surface area
Ready-mix concrete
2.0 cu yd
Net 1.76 yd³ + 10% waste
≈ 3.9 tons (150 lb/ft³)
80 lb premix bags
88 bags
@ ~0.6 ft³ per 80 lb bag (Quikrete-type mix)
DIY only — large pads usually need ready-mix truck
Full material list
Concrete volume (net)
47.5 cu ft (1.76 yd³)
Gravel base (4" compacted)
¾" crushed stone, compacted before pour
1.56 yd³ (~2.1 tons)
Form boards (perimeter)
2×4 or bender board around the pad edge
45.3 linear ft
Vapor barrier (6 mil poly)
Includes ~15% overlap
146 sq ft
#3 rebar @ 16" grid
Chairs to keep rebar centered in slab
201 lf (~11 × 20' sticks)
Estimates only — not a quote. Subgrade, frost depth, local code, pump fees, and finish work can change quantities. Minimum ready-mix orders are often 1 full yard. Always confirm with your supplier before ordering.
Rather have pros handle the pour?
SMT Construction serves Cleveland & Northeast Ohio.