Concrete for a 10 x 10 Slab, 4 Inches Thick
A 10 x 10 foot slab, 4 inches thick, is 33.3 cubic feet or 1.235 cubic yards. That is 56 bags of 80 lb mix with no waste, or 62 bags with 10% extra.
Try your own numbers
Last checked 11/10/2026. Sources: Quikrete: Concrete Mix 1101 data sheet (80 lb bag yields about 0.60 cu ft); 811: Call before you dig (US).
Bags or a truck?
Volume = 10 × 10 × (4 ÷ 12) = 33.3 cu ft. Divide by 27 for cubic yards: 1.235. An 80 lb bag makes about 0.60 cu ft (Quikrete’s data sheet), so 45 bags make a cubic yard. With 10% waste the slab needs 36.7 cu ft, which is 62 bags of 80 lb mix.
That is about 5,000 lb of bagged mix to mix by hand, so many people order ready-mix at this size. Ready-mix is sold by the cubic yard and suppliers set minimum loads and short-load fees, so call before you decide. The calculator shows the ready-mix volume too (1.36 cu yd with waste).
Thickness matters. Going from 4 in to 5 in adds a quarter more concrete. The table under the calculator shows 3, 4, 5 and 6 inches. Slabs that carry vehicles or buildings need a proper design: ask your local building department.
Common questions
How many 60 lb bags for a 10x10 slab?
About 82 bags of 60 lb mix with 10% waste (75 with none). The 60 lb bag yields 0.45 cu ft.
Does rebar or gravel base change the concrete volume?
A gravel base is separate material, worked out in the gravel option. Rebar takes up almost no volume, so it does not reduce the concrete you need.