How much concrete do you need for a 10×16 slab?

A 10×16 ft slab poured 4 inches thick needs 1.98 cubic yards (53.3 cu ft) of concrete. With 10% extra for waste, buy 98 bags of 80 lb premix or order 2.17 yards of ready-mix.

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Your results

Concrete to buy (incl. 10% extra)2.17 cu yd
80 lb bags98
60 lb bags131
40 lb bags196
Exact volume53.33 cu ft (1.98 cu yd)
How much concrete do you need for a 10×16 slab — diagram

Concrete for a 10×16 slab at different thicknesses

The slab covers 160 square feet. Every extra inch of thickness adds about 0.49 cubic yards. Quantities below include 10% for waste.

ThicknessCubic yards80 lb bags60 lb bags40 lb bags
3.5 in1.986115172
4 in2.1798131196
5 in2.72123163245
6 in3.26147196294
8 in4.35196261392

Bags or ready-mix for this size?

At 2.17 cubic yards you are in the gray zone between bags and a truck. 98 bags of 80 lb weigh about 7,840 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 10×16 slab?

Normal-weight concrete weighs about 150 lb per cubic foot, so a 4-inch 10×16 slab weighs roughly 8,000 lb (4 tons) once cured. Make sure your base is compacted gravel on firm, undisturbed soil.

The math

10 ft × 16 ft × (4 in ÷ 12) = 53.33 cu ft 53.33 cu ft ÷ 27 = 1.975 cu yd +10% waste = 58.67 cu ft 58.67 ÷ 0.6 cu ft per 80 lb bag = 98 bags (rounded up)

Common questions

How many 80 lb bags of concrete for a 10x16 slab?

98 bags for a 4-inch slab including 10% extra (89 with no extra). At 6 inches thick you need 147 bags.

How many yards of concrete for a 10x16 slab 6 inches thick?

3.26 cubic yards including 10% extra, or 2.96 yards exactly.

How many 60 lb bags for a 10x16 slab?

131 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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