Concrete slab charts

How much concrete for common slab sizes

Cubic yards and bags for 12 popular patio, shed and garage slab sizes at 4 inches thick. Open a size for 3, 5 and 6 inch slabs and a calculator.

Slab size	Area	Concrete at 4 in	80 lb bags
8 × 8 ft	64 ft²	0.79 yd³	36
10 × 10 ft	100 ft²	1.23 yd³	56
10 × 12 ft	120 ft²	1.48 yd³	67
12 × 12 ft	144 ft²	1.78 yd³	80
10 × 20 ft	200 ft²	2.47 yd³	112
12 × 16 ft	192 ft²	2.37 yd³	107
12 × 20 ft	240 ft²	2.96 yd³	134
16 × 16 ft	256 ft²	3.16 yd³	143
12 × 24 ft	288 ft²	3.56 yd³	160
20 × 20 ft	400 ft²	4.94 yd³	223
24 × 24 ft	576 ft²	7.11 yd³	320
30 × 30 ft	900 ft²	11.11 yd³	500