How many bags of concrete for a 10x10 slab

For a 10x10 slab that's 4 inches thick, you need 62 bags of 80 lb, and that number already includes 10% extra. Enter your own size and you'll know how many bags are needed.

Length (ft)

Width (ft)

Thickness (in)

Add extra for waste0%5%10%

Enter the length, width and thickness to see how many bags you need.

40 lb bags
50 lb bags
60 lb bags
80 lb bags

All bag sizes for a 10x10 slab

Thickness	Cubic yards	40 lb bags	50 lb bags	60 lb bags	80 lb bags
4 in	1.36	123	98	82	62
5 in	1.70	153	123	102	77
6 in	2.04	184	147	123	92

Figures include 10% extra. Yields per bag: Quikrete Concrete Mix No. 1101 and Sakrete High-Strength Concrete Mix, with 0.30, 0.375, 0.45 or 0.60 cu ft for the 40, 50, 60 and 80 lb bags.

Bag counts for concrete by slab size

Slab	4 in (yd³)	80 lb bags	6 in (yd³)	80 lb bags	Bags or truck at 4 in
4 x 4 ft	0.22	10	0.33	15	Bags
4 x 8 ft	0.43	20	0.65	30	Bags
3 x 20 ft	0.81	37	1.22	55	Bags
4 x 20 ft	1.09	49	1.63	74	Ready-mix
8 x 8 ft	0.87	40	1.30	59	Bags
10 x 10 ft	1.36	62	2.04	92	Ready-mix
10 x 12 ft	1.63	74	2.44	110	Ready-mix
12 x 12 ft	1.96	88	2.93	132	Ready-mix
12 x 16 ft	2.61	118	3.91	176	Ready-mix
16 x 16 ft	3.48	157	5.21	235	Ready-mix
20 x 20 ft	5.43	245	8.15	367	Ready-mix
20 x 30 ft	8.15	367	12.22	550	Ready-mix
24 x 24 ft	7.82	352	11.73	528	Ready-mix
30 x 40 ft	16.30	734	24.44	1,100	Ready-mix

The 1 cubic yard mark separates bags from ready-mix. Below that line, bags are simpler to use; above it, ready-mix usually costs less. The figures include 10% extra.

How many bags of concrete do I need for a 10x10 slab?

A slab of 10 by 10 ft gives you 100 square feet of coverage. A 4 in thickness gives a volume of 33.3 cubic feet, and that's 1.23 cubic yards. With 10% extra, that figure becomes 1.36 cubic yards. Each extra inch of thickness means 15 more 80 lb bags.