American Concrete Institute (ACI 318)30 Verified Slab Formats
Concrete Slab Volume & Material Takeoff Directory
Eliminate ordering shortages and overpaying short-load truck fees. Select your slab dimensions below to get the exact cubic yards (with 10% safety buffer), premix bag counts (80lb & 60lb), gravel subbase requirements, and rebar grid sizing.
4-Inch Standard Slabs (Patios, Sheds & Light Vehicles)
Standard residential code depth for pedestrian areas and standard cars8 × 8 ft (64 sq ft)
Order Volume (+10%):0.87 yd³
80 lb Premix Bags:40 bags
Compacted Gravel:0.91 yd³
10 × 10 ft (100 sq ft)
Order Volume (+10%):1.35 yd³
80 lb Premix Bags:62 bags
Compacted Gravel:1.42 yd³
10 × 12 ft (120 sq ft)
Order Volume (+10%):1.63 yd³
80 lb Premix Bags:74 bags
Compacted Gravel:1.7 yd³
10 × 20 ft (200 sq ft)
Order Volume (+10%):2.72 yd³
80 lb Premix Bags:123 bags
Compacted Gravel:2.84 yd³
12 × 12 ft (144 sq ft)
Order Volume (+10%):1.96 yd³
80 lb Premix Bags:89 bags
Compacted Gravel:2.04 yd³
12 × 16 ft (192 sq ft)
Order Volume (+10%):2.61 yd³
80 lb Premix Bags:118 bags
Compacted Gravel:2.73 yd³
12 × 20 ft (240 sq ft)
Order Volume (+10%):3.26 yd³
80 lb Premix Bags:147 bags
Compacted Gravel:3.41 yd³
12 × 24 ft (288 sq ft)
Order Volume (+10%):3.92 yd³
80 lb Premix Bags:177 bags
Compacted Gravel:4.09 yd³
14 × 20 ft (280 sq ft)
Order Volume (+10%):3.81 yd³
80 lb Premix Bags:172 bags
Compacted Gravel:3.98 yd³
16 × 20 ft (320 sq ft)
Order Volume (+10%):4.35 yd³
80 lb Premix Bags:196 bags
Compacted Gravel:4.54 yd³
20 × 20 ft (400 sq ft)
Order Volume (+10%):5.43 yd³
80 lb Premix Bags:245 bags
Compacted Gravel:5.68 yd³
20 × 24 ft (480 sq ft)
Order Volume (+10%):6.52 yd³
80 lb Premix Bags:294 bags
Compacted Gravel:6.81 yd³
24 × 24 ft (576 sq ft)
Order Volume (+10%):7.82 yd³
80 lb Premix Bags:353 bags
Compacted Gravel:8.18 yd³
24 × 30 ft (720 sq ft)
Order Volume (+10%):9.78 yd³
80 lb Premix Bags:440 bags
Compacted Gravel:10.22 yd³
30 × 40 ft (1200 sq ft)
Order Volume (+10%):16.29 yd³
80 lb Premix Bags:734 bags
Compacted Gravel:17.04 yd³
6-Inch Heavy Slabs (Workshops, RV Pads & Auto Lifts)
Structural foundation rating for heavy vehicles, machinery, and post-installed anchors8 × 8 ft (64 sq ft)
Order Volume (+10%):1.31 yd³
80 lb Premix Bags:59 bags
Compacted Gravel:0.91 yd³
10 × 10 ft (100 sq ft)
Order Volume (+10%):2.04 yd³
80 lb Premix Bags:92 bags
Compacted Gravel:1.42 yd³
10 × 12 ft (120 sq ft)
Order Volume (+10%):2.44 yd³
80 lb Premix Bags:110 bags
Compacted Gravel:1.7 yd³
10 × 20 ft (200 sq ft)
Order Volume (+10%):4.07 yd³
80 lb Premix Bags:184 bags
Compacted Gravel:2.84 yd³
12 × 12 ft (144 sq ft)
Order Volume (+10%):2.94 yd³
80 lb Premix Bags:132 bags
Compacted Gravel:2.04 yd³
12 × 16 ft (192 sq ft)
Order Volume (+10%):3.92 yd³
80 lb Premix Bags:177 bags
Compacted Gravel:2.73 yd³
12 × 20 ft (240 sq ft)
Order Volume (+10%):4.88 yd³
80 lb Premix Bags:220 bags
Compacted Gravel:3.41 yd³
12 × 24 ft (288 sq ft)
Order Volume (+10%):5.86 yd³
80 lb Premix Bags:264 bags
Compacted Gravel:4.09 yd³
14 × 20 ft (280 sq ft)
Order Volume (+10%):5.71 yd³
80 lb Premix Bags:257 bags
Compacted Gravel:3.98 yd³
16 × 20 ft (320 sq ft)
Order Volume (+10%):6.52 yd³
80 lb Premix Bags:294 bags
Compacted Gravel:4.54 yd³
20 × 20 ft (400 sq ft)
Order Volume (+10%):8.15 yd³
80 lb Premix Bags:367 bags
Compacted Gravel:5.68 yd³
20 × 24 ft (480 sq ft)
Order Volume (+10%):9.78 yd³
80 lb Premix Bags:440 bags
Compacted Gravel:6.81 yd³
24 × 24 ft (576 sq ft)
Order Volume (+10%):11.74 yd³
80 lb Premix Bags:528 bags
Compacted Gravel:8.18 yd³
24 × 30 ft (720 sq ft)
Order Volume (+10%):14.66 yd³
80 lb Premix Bags:661 bags
Compacted Gravel:10.22 yd³
30 × 40 ft (1200 sq ft)
Order Volume (+10%):24.44 yd³
80 lb Premix Bags:1100 bags
Compacted Gravel:17.04 yd³