How much concrete do you need for a 10×10 slab?

A 10×10 ft slab poured 4 inches thick needs 1.23 cubic yards (33.3 cu ft) of concrete. With 10% extra for waste, buy 62 bags of 80 lb premix or order 1.36 yards of ready-mix.

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Your results

Concrete to buy (incl. 10% extra)1.36 cu yd
80 lb bags62
60 lb bags82
40 lb bags123
Exact volume33.33 cu ft (1.23 cu yd)
How much concrete do you need for a 10×10 slab — diagram

Concrete for a 10×10 slab at different thicknesses

The slab covers 100 square feet. Every extra inch of thickness adds about 0.31 cubic yards. Quantities below include 10% for waste.

ThicknessCubic yards80 lb bags60 lb bags40 lb bags
3.5 in1.195472107
4 in1.366282123
5 in1.777102153
6 in2.0492123184
8 in2.72123163245

Bags or ready-mix for this size?

At 1.36 cubic yards you are in the gray zone between bags and a truck. 62 bags of 80 lb weigh about 4,960 lb in total — get a ready-mix quote (ask about short-load fees) and compare it with the bag price before deciding.

How heavy is a 10×10 slab?

Normal-weight concrete weighs about 150 lb per cubic foot, so a 4-inch 10×10 slab weighs roughly 5,000 lb (2.5 tons) once cured. Make sure your base is compacted gravel on firm, undisturbed soil.

The math

10 ft × 10 ft × (4 in ÷ 12) = 33.33 cu ft 33.33 cu ft ÷ 27 = 1.235 cu yd +10% waste = 36.67 cu ft 36.67 ÷ 0.6 cu ft per 80 lb bag = 62 bags (rounded up)

Common questions

How many 80 lb bags of concrete for a 10x10 slab?

62 bags for a 4-inch slab including 10% extra (56 with no extra). At 6 inches thick you need 92 bags.

How many yards of concrete for a 10x10 slab 6 inches thick?

2.04 cubic yards including 10% extra, or 1.85 yards exactly.

How many 60 lb bags for a 10x10 slab?

82 bags of 60 lb concrete for a 4-inch slab with 10% extra.

Want the full method, tips and other sizes? See the concrete calculator guide.

Last reviewed November 1, 2026. Results are estimates — confirm with your supplier.

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